Akarin 1.12.2 0.3.2 LTS Release

chmod u+x scripts/inst.sh

README.md

@@ -5,7 +5,7 @@
 
 Introduction
 ---
-> Akarin is a powerful server software form the 'new dimension', formerly known as [Torch](https://github.com/Akarin-project/Torch).
+> Akarin is a powerful server software form the 'new dimension', formerly known as Torch.
 
 As a [Paper](https://github.com/PaperMC/Paper) fork, it supports almost all plugins that [Spigot](https://hub.spigotmc.org/stash/projects/SPIGOT/repos/spigot/browse) can use.
 
@@ -20,8 +20,8 @@ Get Akarin
 ---
 ### Download
 #### Recommended Sites
++ [**Jenkins**](http://ci.ilummc.com/job/Akarin/) - *Kudos to [Izzel_Aliz](https://github.com/IzzelAliz)*
 + [![Circle CI](https://circleci.com/gh/Akarin-project/Akarin/tree/master.svg?style=svg) **Circle CI**](https://circleci.com/gh/Akarin-project/Akarin/tree/master) - Checkout the 'Artifacts' tab of the latest build  *Login required*
-+ [![PCD Jenkins](http://ci.pcd.ac.cn/job/Akarin/badge/icon) **Jenkins**](http://ci.ilummc.com/job/Akarin/) - *Kudos to [Izzel_Aliz](https://github.com/IzzelAliz)*
 
 *Contact me via the email below or open an [Issue](https://github.com/Akarin-project/akarin/issues) if you want to add your website here*
 
@@ -47,7 +47,7 @@ Contributing
 ---
 * Feel free to open an [Issue](https://github.com/Akarin-project/akarin/issues) if you have any problem with Akarin.
 * [Pull Request](https://github.com/Akarin-project/akarin/pulls) is welcomed, Akarin use [Mixin](https://github.com/SpongePowered/Mixin) to modify the code, you can checkout `sources` folder to see them. Moreover, add your name to the [LICENSE](https://github.com/Akarin-project/Akarin/blob/master/LICENSE.md) if you want to publish your code under the [MIT License](https://github.com/Akarin-project/Akarin/blob/master/licenses/MIT.md).
-* If you want to join the [Akarin-project](https://github.com/Akarin-project) team, you can send an email to `kira@kira.moe` with your experience and necessary information. Besides, welcome to join our [TIM Group](https://jq.qq.com/?_wv=1027&k=59q2kV4) to chat *(Chinese)*.
+* If you want to join the [Akarin-project](https://github.com/Akarin-project) team, you can send an email to `kira@kira.moe` with your experience and necessary information. Besides, welcome to join our [Discord](https://discord.gg/D3Rsukh) to chat.
 * Note that you must `--setup` at least once to deploy necessary dependency otherwise some imports cannot be organized.
 
 ![Akarin project](https://i.loli.net/2018/05/13/5af7fbbfbcddf.png)

scripts/build.sh

@@ -19,21 +19,26 @@ if [ "$2" == "--setup" ] || [ "$3" == "--setup" ] || [ "$4" == "--setup" ]; then
 		fi
 		
 		cd "$paperbasedir"
-		./paper patch
+		./paper jar
 	)
 fi
 
 echo "[Akarin] Ready to build"
 (
 	echo "[Akarin] Touch sources.."
-	\cp -rf "$basedir/sources/src" "$paperbasedir/Paper-Server/"
-	\cp -rf "$basedir/sources/pom.xml" "$paperbasedir/Paper-Server/"
 	
 	cd "$paperbasedir"
 	if [ "$2" == "--fast" ] || [ "$3" == "--fast" ] || [ "$4" == "--fast" ]; then
 		echo "[Akarin] Test has been skipped"
+		\cp -rf "$basedir/sources/src" "$paperbasedir/Paper-Server/"
+		\cp -rf "$basedir/sources/pom.xml" "$paperbasedir/Paper-Server/"
 		mvn clean install -DskipTests
-	else 
+	else
+		rm -rf Paper-API/src
+		rm -rf Paper-Server/src
+		./paper patch
+		\cp -rf "$basedir/sources/src" "$paperbasedir/Paper-Server/"
+		\cp -rf "$basedir/sources/pom.xml" "$paperbasedir/Paper-Server/"
 		mvn clean install
 	fi
 	

sources/pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>akarin</artifactId>
     <packaging>jar</packaging>
-    <version>1.12.2-R0.1-RELEASE</version>
+    <version>1.12.2-R0.3-SNAPSHOT</version>
     <name>Akarin</name>
     <url>https://github.com/Akarin-project/Akarin</url>
 
@@ -126,12 +126,12 @@
         <dependency>
             <groupId>io.akarin</groupId>
             <artifactId>legacylauncher</artifactId>
-            <version>1.20</version>
+            <version>1.23</version>
         </dependency>
         <dependency>
             <groupId>org.spongepowered</groupId>
             <artifactId>mixin</artifactId>
-            <version>0.7.8-SNAPSHOT</version>
+            <version>0.7.10-SNAPSHOT</version>
         </dependency>
     </dependencies>
 
@@ -148,6 +148,10 @@
             <id>spongepowered-repo</id>
             <url>https://repo.spongepowered.org/maven/</url>
         </repository>
+        <repository>
+            <id>nallar-repo</id>
+            <url>http://repo.nallar.me/</url>
+        </repository>
     </repositories>
 
     <pluginRepositories>
@@ -168,7 +172,7 @@
                 <version>1.3</version>
                 <configuration>
                     <outputPrefix>git-Akarin-</outputPrefix>
-                    <scmDirectory>..</scmDirectory>
+                    <scmDirectory>../..</scmDirectory> <!-- Akarin -->
                 </configuration>
                 <executions>
                     <execution>

sources/src/main/java/io/akarin/api/internal/Akari.java

@@ -1,4 +1,4 @@
-package io.akarin.api;
+package io.akarin.api.internal;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
@@ -8,38 +8,62 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadFactory;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-
 import com.google.common.collect.Queues;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 import co.aikar.timings.Timing;
 import co.aikar.timings.Timings;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.MinecraftServer;
 
+@SuppressWarnings("restriction")
 public abstract class Akari {
     /**
      * A common logger used by mixin classes
      */
     public final static Logger logger = LogManager.getLogger("Akarin");
     
-    /**
-     * Temporarily disable desync timings error, moreover it's worthless to trace async operation
-     */
-    public static volatile boolean silentTiming;
-    
     /**
      * A common thread pool factory
      */
-    public static final ThreadFactory STAGE_FACTORY = new ThreadFactoryBuilder().setNameFormat("Akarin Schedule Thread - %1$d").build();
+    public static final ThreadFactory STAGE_FACTORY = new ThreadFactoryBuilder().setNameFormat("Akarin Parallel Registry Thread - %1$d").build();
     
     /**
      * Main thread callback tasks
      */
     public static final Queue<Runnable> callbackQueue = Queues.newConcurrentLinkedQueue();
     
+    public static class AssignableThread extends Thread {
+        public AssignableThread(Runnable run) {
+            super(run);
+        }
+    }
+    
+    public static class AssignableFactory implements ThreadFactory {
+        @Override
+        public Thread newThread(Runnable run) {
+            Thread thread = new AssignableThread(run);
+            thread.setName("Akarin Parallel Schedule Thread");
+            thread.setPriority(AkarinGlobalConfig.primaryThreadPriority); // Fair
+            return thread;
+        }
+    }
+    
     /**
      * A common tick pool
      */
-    public static final ExecutorCompletionService<Void> STAGE_TICK = new ExecutorCompletionService<Void>(Executors.newFixedThreadPool(1, Akari.STAGE_FACTORY));
+    public static final ExecutorCompletionService<?> STAGE_TICK = new ExecutorCompletionService<>(Executors.newSingleThreadExecutor(new AssignableFactory()));
+    
+    public static boolean isPrimaryThread() {
+        return isPrimaryThread(true);
+    }
+    
+    public static boolean isPrimaryThread(boolean assign) {
+        Thread current = Thread.currentThread();
+        return current == MinecraftServer.getServer().primaryThread || (assign ? current instanceof AssignableThread : false);
+    }
+    
+    public static final String EMPTY_STRING = "";
     
     /*
      * The unsafe
@@ -57,10 +81,18 @@ public abstract class Akari {
         }
     }
     
+    private static final String serverVersion = Akari.class.getPackage().getImplementationVersion();
+    
+    public static String getServerVersion() {
+        return serverVersion + " (MC: " + MinecraftServer.getServer().getVersion() + ")";
+    }
+    
     /*
      * Timings
      */
-    public final static Timing worldTiming = getTiming("Akarin - World");
+    public final static Timing worldTiming = getTiming("Akarin - Full World Tick");
+    
+    public final static Timing entityCallbackTiming = getTiming("Akarin - Entity Callback");
     
     public final static Timing callbackTiming = getTiming("Akarin - Callback");
     

sources/src/main/java/io/akarin/api/internal/LocalAddress.java

@@ -1,4 +1,4 @@
-package io.akarin.api;
+package io.akarin.api.internal;
 
 import java.net.InetAddress;
 

sources/src/main/java/io/akarin/api/internal/collections/CheckedConcurrentLinkedQueue.java

@@ -33,7 +33,7 @@
  * at http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-package io.akarin.api;
+package io.akarin.api.internal.collections;
 
 import java.util.AbstractQueue;
 import java.util.ArrayList;
@@ -45,6 +45,8 @@ import java.util.Spliterator;
 import java.util.Spliterators;
 import java.util.function.Consumer;
 
+import io.akarin.api.internal.Akari;
+
 /**
  * An unbounded thread-safe {@linkplain Queue queue} based on linked nodes.
  * This queue orders elements FIFO (first-in-first-out).

sources/src/main/java/io/akarin/api/internal/collections/WrappedCollections.java

@@ -1,4 +1,4 @@
-package io.akarin.api;
+package io.akarin.api.internal.collections;
 
 import java.io.Serializable;
 import java.io.ObjectOutputStream;

sources/src/main/java/io/akarin/api/internal/mixin/IMixinChunk.java

@@ -0,0 +1,28 @@
+package io.akarin.api.internal.mixin;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.server.Chunk;
+import net.minecraft.server.EnumSkyBlock;
+
+public interface IMixinChunk {
+    AtomicInteger getPendingLightUpdates();
+    
+    long getLightUpdateTime();
+    
+    boolean areNeighborsLoaded();
+    
+    @Nullable Chunk getNeighborChunk(int index);
+    
+    CopyOnWriteArrayList<Short> getQueuedLightingUpdates(EnumSkyBlock type);
+    
+    List<Chunk> getNeighbors();
+    
+    void setNeighborChunk(int index, @Nullable Chunk chunk);
+    
+    void setLightUpdateTime(long time);
+}

sources/src/main/java/io/akarin/api/internal/mixin/IMixinLockProvider.java

@@ -0,0 +1,5 @@
+package io.akarin.api.internal.mixin;
+
+public interface IMixinLockProvider {
+    public Object lock();
+}

sources/src/main/java/io/akarin/api/internal/mixin/IMixinRealTimeTicking.java

@@ -0,0 +1,30 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.api.internal.mixin;
+
+public interface IMixinRealTimeTicking {
+
+    long getRealTimeTicks();
+}

sources/src/main/java/io/akarin/api/internal/mixin/IMixinWorldServer.java

@@ -0,0 +1,13 @@
+package io.akarin.api.internal.mixin;
+
+import java.util.concurrent.ExecutorService;
+
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.EnumSkyBlock;
+
+public interface IMixinWorldServer {
+    boolean updateLightAsync(EnumSkyBlock lightType, BlockPosition pos, Chunk chunk);
+    
+    ExecutorService getLightingExecutor();
+}

sources/src/main/java/io/akarin/server/core/AkarinGlobalConfig.java

@@ -3,6 +3,8 @@ package io.akarin.server.core;
 import com.google.common.base.Throwables;
 import com.google.common.collect.Lists;
 
+import io.akarin.api.internal.Akari;
+
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
@@ -14,8 +16,8 @@ import java.util.regex.Pattern;
 
 import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.YamlConfiguration;
-import io.akarin.api.Akari;
 
+@SuppressWarnings("unused")
 public class AkarinGlobalConfig {
     
     private static File CONFIG_FILE;
@@ -153,11 +155,6 @@ public class AkarinGlobalConfig {
         legacyVersioningCompat = getBoolean("alternative.legacy-versioning-compat", false);
     }
     
-    public static int registryTerminationSeconds;
-    private static void registryTerminationSeconds() {
-        registryTerminationSeconds = getSeconds(getString("bootstrap.parallel-registry-termination", "9s"));
-    }
-    
     public static int playersPerIOThread;
     private static void playersPerIOThread() {
         playersPerIOThread = getInt("core.players-per-chunk-io-thread", 50);
@@ -173,23 +170,113 @@ public class AkarinGlobalConfig {
         legacyWorldTimings = getBoolean("alternative.legacy-world-timings-required", false);
     }
     
-    public static int timeUpdateInterval;
+    public static long timeUpdateInterval;
     private static void timeUpdateInterval() {
-        timeUpdateInterval = getSeconds(getString("core.world-time-update-interval", "1s"));
+        timeUpdateInterval = getSeconds(getString("core.tick-rate.world-time-update-interval", "1s")) * 10;
     }
     
-    public static int keepAliveSendInterval;
+    public static long keepAliveSendInterval;
     private static void keepAliveSendInterval() {
-        keepAliveSendInterval = getSeconds(getString("core.keep-alive-packet-send-interval", "15s"));
+        keepAliveSendInterval = getSeconds(getString("core.tick-rate.keep-alive-packet-send-interval", "15s")) * 1000;
     }
     
-    public static int keepAliveTimeout;
+    public static long keepAliveTimeout;
     private static void keepAliveTimeout() {
-        keepAliveTimeout = getSeconds(getString("core.keep-alive-response-timeout", "30s"));
+        keepAliveTimeout = getSeconds(getString("core.keep-alive-response-timeout", "30s")) * 1000;
+    }
+    
+    public static boolean throwOnAsyncCaught;
+    private static void throwOnAsyncCaught() {
+        throwOnAsyncCaught = getBoolean("core.thread-safe.async-catcher.throw-on-caught", true);
     }
     
     public static boolean allowSpawnerModify;
     private static void allowSpawnerModify() {
         allowSpawnerModify = getBoolean("alternative.allow-spawner-modify", true);
     }
+    
+    public static boolean noResponseDoGC;
+    private static void noResponseDoGC() {
+        noResponseDoGC = getBoolean("alternative.gc-before-stuck-restart", true);
+    }
+    
+    public static String messageKick;
+    private static void messageKick() {
+        messageKick = getString("messages.disconnect.kick-player", "Kicked by an operator.");
+    }
+    
+    public static String messageBan;
+    private static void messageBan() {
+        messageBan = getString("messages.disconnect.ban-player-name", "You are banned from this server! %s %s");
+    }
+    
+    public static String messageBanReason;
+    private static void messageBanReason() {
+        messageBanReason = getString("messages.disconnect.ban-reason", "\nReason: ");
+    }
+    
+    public static String messageBanExpires;
+    private static void messageBanExpires() {
+        messageBanExpires = getString("messages.disconnect.ban-expires", "\nYour ban will be removed on ");
+    }
+    
+    public static String messageBanIp;
+    private static void messageBanIp() {
+        messageBanIp = getString("messages.disconnect.ban-player-ip", "Your IP address is banned from this server! %s %s");
+    }
+    
+    public static String messageDupLogin;
+    private static void messageDupLogin() {
+        messageDupLogin = getString("messages.disconnect.kick-player-duplicate-login", "You logged in from another location");
+    }
+    
+    public static String messageJoin;
+    private static void messageJoin() {
+        messageJoin = getString("messages.connect.player-join-server", "§e%s joined the game");
+    }
+    
+    public static String messageJoinRenamed;
+    private static void messageJoinRenamed() {
+        messageJoinRenamed = getString("messages.connect.renamed-player-join-server", "§e%s (formerly known as %s) joined the game");
+    }
+    
+    public static String messageKickKeepAlive;
+    private static void messagekickKeepAlive() {
+        messageKickKeepAlive = getString("messages.disconnect.kick-player-timeout-keep-alive", "Timed out");
+    }
+    
+    public static String messagePlayerQuit;
+    private static void messagePlayerQuit() {
+        messagePlayerQuit = getString("messages.disconnect.player-quit-server", "§e%s left the game");
+    }
+    
+    public static String serverBrandName;
+    private static void serverBrandName() {
+        serverBrandName = getString("alternative.modified-server-brand-name", "");
+    }
+    
+    public static boolean disableEndPortalCreate;
+    private static void disableEndPortalCreate() {
+        disableEndPortalCreate = getBoolean("alternative.disable-end-portal-create", false);
+    }
+    
+    public static int primaryThreadPriority;
+    private static void primaryThreadPriority() {
+        primaryThreadPriority = getInt("core.primary-thread-priority", 7);
+    }
+    
+    public static long playersInfoUpdateInterval;
+    private static void playersInfoUpdateInterval() {
+        playersInfoUpdateInterval = getSeconds(getString("core.tick-rate.players-info-update-interval", "30s")) * 10;
+    }
+    
+    public static long versionUpdateInterval;
+    private static void versionUpdateInterval() {
+        versionUpdateInterval = getSeconds(getString("alternative.version-update-interval", "3600s")) * 1000; // 1 hour
+    }
+    
+    public static boolean sendLightOnlyChunkSection;
+    private static void sendLightOnlyChunkSection() {
+        sendLightOnlyChunkSection = getBoolean("core.send-light-only-chunk-sections", true);
+    }
 }

sources/src/main/java/io/akarin/server/core/AkarinSlackScheduler.java

@@ -1,11 +1,17 @@
 package io.akarin.server.core;
 
-import io.akarin.api.Akari;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+
+import io.akarin.api.internal.Akari;
 import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.EnumDifficulty;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.PacketPlayOutKeepAlive;
+import net.minecraft.server.PacketPlayOutPlayerInfo;
 import net.minecraft.server.PacketPlayOutUpdateTime;
 import net.minecraft.server.PlayerConnection;
+import net.minecraft.server.WorldServer;
 
 public class AkarinSlackScheduler extends Thread {
     public static AkarinSlackScheduler get() {
@@ -24,49 +30,77 @@ public class AkarinSlackScheduler extends Thread {
         private static final AkarinSlackScheduler instance = new AkarinSlackScheduler();
     }
     
+    /*
+     * Timers
+     */
     private long updateTime;
+    private long resendPlayersInfo;
 
     @Override
     public void run() {
         MinecraftServer server = MinecraftServer.getServer();
         
-        // Send time updates to everyone, it will get the right time from the world the player is in.
-        if (++updateTime == AkarinGlobalConfig.timeUpdateInterval * 10) {
+        while (server.isRunning()) {
+            // Send time updates to everyone, it will get the right time from the world the player is in.
+            // Time update, from MinecraftServer#D
+            if (++updateTime >= AkarinGlobalConfig.timeUpdateInterval) {
+                for (EntityPlayer player : server.getPlayerList().players) {
+                    player.playerConnection.sendPacket(new PacketPlayOutUpdateTime(player.world.getTime(), player.getPlayerTime(), player.world.getGameRules().getBoolean("doDaylightCycle"))); // Add support for per player time
+                }
+                updateTime = 0;
+            }
+            
+            // Keep alive, from PlayerConnection#e
             for (EntityPlayer player : server.getPlayerList().players) {
-                player.playerConnection.sendPacket(new PacketPlayOutUpdateTime(player.world.getTime(), player.getPlayerTime(), player.world.getGameRules().getBoolean("doDaylightCycle"))); // Add support for per player time
-            }
-            updateTime = 0;
-        }
-        
-        for (EntityPlayer player : server.getPlayerList().players) {
-            PlayerConnection conn = player.playerConnection;
-            // Paper - give clients a longer time to respond to pings as per pre 1.12.2 timings
-            // This should effectively place the keepalive handling back to "as it was" before 1.12.2
-            long currentTime = System.currentTimeMillis();
-            long elapsedTime = currentTime - conn.getLastPing();
-            if (conn.isPendingPing()) {
-                // We're pending a ping from the client
-                if (!conn.processedDisconnect && elapsedTime >= AkarinGlobalConfig.keepAliveTimeout * 1000L) { // check keepalive limit, don't fire if already disconnected
-                    Akari.callbackQueue.add(() -> {
-                        Akari.logger.warn("{} was kicked due to keepalive timeout!", conn.player.getName()); // more info
-                        conn.disconnect("disconnect.timeout");
-                    });
-                }
-            } else {
-                if (elapsedTime >= AkarinGlobalConfig.keepAliveSendInterval * 1000L) { // 15 seconds default
-                    conn.setPendingPing(true);
-                    conn.setLastPing(currentTime);
-                    conn.setKeepAliveID(currentTime);
-                    conn.sendPacket(new PacketPlayOutKeepAlive(conn.getKeepAliveID()));
+                PlayerConnection conn = player.playerConnection;
+                // Paper - give clients a longer time to respond to pings as per pre 1.12.2 timings
+                // This should effectively place the keepalive handling back to "as it was" before 1.12.2
+                long currentTime = System.nanoTime() / 1000000L;
+                long elapsedTime = currentTime - conn.getLastPing();
+                if (conn.isPendingPing()) {
+                    // We're pending a ping from the client
+                    if (!conn.processedDisconnect && elapsedTime >= AkarinGlobalConfig.keepAliveTimeout) { // check keepalive limit, don't fire if already disconnected
+                        Akari.callbackQueue.add(() -> {
+                            Akari.logger.warn("{} was kicked due to keepalive timeout!", conn.player.getName()); // more info
+                            conn.disconnect("disconnect.timeout");
+                        });
+                    }
+                } else {
+                    if (elapsedTime >= AkarinGlobalConfig.keepAliveSendInterval) { // 15 seconds default
+                        conn.setPendingPing(true);
+                        conn.setLastPing(currentTime);
+                        conn.setKeepAliveID(currentTime);
+                        conn.sendPacket(new PacketPlayOutKeepAlive(conn.getKeepAliveID()));
+                    }
                 }
             }
-        }
-        
-        try {
-            Thread.sleep(100);
-        } catch (InterruptedException ex) {
-            Akari.logger.warn("Slack scheduler thread was interrupted unexpectly!");
-            ex.printStackTrace();
+            
+            // Force hardcore difficulty, from WorldServer#doTick
+            for (WorldServer world : server.worlds) {
+                if (world.getWorldData().isHardcore() && world.getDifficulty() != EnumDifficulty.HARD) {
+                    world.getWorldData().setDifficulty(EnumDifficulty.HARD);
+                }
+            }
+            
+            // Update player info, from PlayerList#tick
+            if (++resendPlayersInfo > AkarinGlobalConfig.playersInfoUpdateInterval) {
+                for (EntityPlayer target : server.getPlayerList().players) {
+                    target.playerConnection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_LATENCY, Iterables.filter(server.getPlayerList().players, new Predicate<EntityPlayer>() {
+                        @Override
+                        public boolean apply(EntityPlayer input) {
+                            return target.getBukkitEntity().canSee(input.getBukkitEntity());
+                        }
+                    })));
+                }
+                resendPlayersInfo = 0;
+            }
+            
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException ex) {
+                Akari.logger.warn("Slack scheduler thread was interrupted unexpectly!");
+                ex.printStackTrace();
+            }
         }
     }
     

sources/src/main/java/io/akarin/server/core/ChannelAdapter.java

@@ -1,49 +0,0 @@
-package io.akarin.server.core;
-
-import java.util.List;
-
-import io.netty.channel.Channel;
-import io.netty.channel.ChannelException;
-import io.netty.channel.ChannelInitializer;
-import io.netty.channel.ChannelOption;
-import io.netty.handler.timeout.ReadTimeoutHandler;
-import net.minecraft.server.EnumProtocolDirection;
-import net.minecraft.server.HandshakeListener;
-import net.minecraft.server.LegacyPingHandler;
-import net.minecraft.server.MinecraftServer;
-import net.minecraft.server.NetworkManager;
-import net.minecraft.server.PacketDecoder;
-import net.minecraft.server.PacketEncoder;
-import net.minecraft.server.PacketPrepender;
-import net.minecraft.server.PacketSplitter;
-
-public class ChannelAdapter extends ChannelInitializer<Channel> {
-    private final List<NetworkManager> managers;
-    
-    public ChannelAdapter(List<NetworkManager> list) {
-        managers = list;
-    }
-    
-    public static ChannelAdapter create(List<NetworkManager> managers) {
-        return new ChannelAdapter(managers);
-    }
-    
-    @Override
-    protected void initChannel(Channel channel) {
-        try {
-            channel.config().setOption(ChannelOption.TCP_NODELAY, true);
-        } catch (ChannelException ex) {
-            ;
-        }
-        channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30))
-                          .addLast("legacy_query", new LegacyPingHandler(MinecraftServer.getServer().getServerConnection()))
-                          .addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder(EnumProtocolDirection.SERVERBOUND))
-                          .addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder(EnumProtocolDirection.CLIENTBOUND));
-        
-        NetworkManager manager = new NetworkManager(EnumProtocolDirection.SERVERBOUND);
-        managers.add(manager);
-        
-        channel.pipeline().addLast("packet_handler", manager);
-        manager.setPacketListener(new HandshakeListener(MinecraftServer.getServer(), manager));
-    }
-}

sources/src/main/java/io/akarin/server/mixin/bootstrap/Bootstrap.java

@@ -10,11 +10,11 @@ import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-import io.akarin.api.Akari;
+import io.akarin.api.internal.Akari;
 import io.akarin.server.core.AkarinGlobalConfig;
 
 @Mixin(value = Main.class, remap = false)
-public class Bootstrap {
+public abstract class Bootstrap {
     @Inject(method = "main([Ljava/lang/String;)V", at = @At("HEAD"))
     private static void premain(CallbackInfo info) {
         AkarinGlobalConfig.init(new File("akarin.yml"));

sources/src/main/java/io/akarin/server/mixin/bootstrap/DummyEula.java

@@ -7,7 +7,7 @@ import org.spongepowered.asm.mixin.Overwrite;
 import net.minecraft.server.EULA;
 
 @Mixin(value = EULA.class, remap = false)
-public class DummyEula {
+public abstract class DummyEula {
     /**
      * Read then check the EULA file <i>formerly</i>
      * @param file

sources/src/main/java/io/akarin/server/mixin/bootstrap/MetricsBootstrap.java

@@ -14,7 +14,7 @@ import com.destroystokyo.paper.Metrics;
 import net.minecraft.server.MinecraftServer;
 
 @Mixin(targets = "com.destroystokyo.paper.Metrics$PaperMetrics", remap = false)
-public class MetricsBootstrap {
+public abstract class MetricsBootstrap {
     @Overwrite
     static void startMetrics() {
         // Get the config file

sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinMetrics.java

@@ -17,7 +17,7 @@ import com.destroystokyo.paper.Metrics;
 import com.destroystokyo.paper.Metrics.CustomChart;
 
 @Mixin(value = Metrics.class, remap = false)
-public class MixinMetrics {
+public abstract class MixinMetrics {
     // The url to which the data is sent - bukkit/Torch (keep our old name)
     private final static String URL = "https://bStats.org/submitData/bukkit";
     

sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinRestartCommand.java

@@ -0,0 +1,22 @@
+package io.akarin.server.mixin.bootstrap;
+
+import org.spigotmc.RestartCommand;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.server.core.AkarinGlobalConfig;
+
+@Mixin(value = RestartCommand.class, remap = false)
+public abstract class MixinRestartCommand {
+    @Inject(method = "restart()V", at = @At("HEAD"))
+    private static void beforeRestart(CallbackInfo ci) {
+        if (AkarinGlobalConfig.noResponseDoGC) {
+            Akari.logger.warn("Attempting to garbage collect, may takes a few seconds");
+            System.runFinalization();
+            System.gc();
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/bootstrap/ParallelRegistry.java

@@ -10,8 +10,7 @@ import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-import io.akarin.api.Akari;
-import io.akarin.server.core.AkarinGlobalConfig;
+import io.akarin.api.internal.Akari;
 import net.minecraft.server.BiomeBase;
 import net.minecraft.server.Block;
 import net.minecraft.server.BlockFire;
@@ -25,7 +24,7 @@ import net.minecraft.server.PotionRegistry;
 import net.minecraft.server.SoundEffect;
 
 @Mixin(value = DispenserRegistry.class, remap = false)
-public class ParallelRegistry {
+public abstract class ParallelRegistry {
     /**
      * Registry order: SoundEffect -> Block
      */
@@ -40,8 +39,6 @@ public class ParallelRegistry {
      */
     private static final ExecutorService STAGE_STANDALONE = Executors.newFixedThreadPool(3, Akari.STAGE_FACTORY);
     
-    private static final int TERMINATION_IN_SEC = AkarinGlobalConfig.registryTerminationSeconds;
-    
     // We should keep the original order in codes thought orderless in runtime
     @Redirect(method = "c()V", at = @At(
             value = "INVOKE",
@@ -131,11 +128,12 @@ public class ParallelRegistry {
         // Shutdown BLOCK and STANDALONE stage
         STAGE_STANDALONE.shutdown();
         STAGE_BLOCK.shutdown();
-        STAGE_BLOCK.awaitTermination(TERMINATION_IN_SEC, TimeUnit.SECONDS);
+        STAGE_BLOCK.awaitTermination(10, TimeUnit.MINUTES);
         
         STAGE_BLOCK_BASE.shutdown(); // This must after STAGE_BLOCK terminated
-        STAGE_BLOCK_BASE.awaitTermination(TERMINATION_IN_SEC, TimeUnit.SECONDS);
+        STAGE_BLOCK_BASE.awaitTermination(20, TimeUnit.MINUTES);
 
-        STAGE_STANDALONE.awaitTermination(TERMINATION_IN_SEC, TimeUnit.SECONDS); // Behind the shutdown of BLOCK_BASE should faster
+        STAGE_STANDALONE.awaitTermination(30, TimeUnit.MINUTES); // Behind the shutdown of BLOCK_BASE should faster
     }
+    
 }

sources/src/main/java/io/akarin/server/mixin/bootstrap/Watchcat.java

@@ -20,7 +20,7 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import net.minecraft.server.MinecraftServer;
 
 @Mixin(value = WatchdogThread.class, remap = false)
-public class Watchcat extends Thread {
+public abstract class Watchcat extends Thread {
     @Shadow private static WatchdogThread instance;
     @Shadow private @Final long timeoutTime;
     @Shadow private @Final boolean restart;
@@ -74,7 +74,7 @@ public class Watchcat extends Thread {
                 }
                 log.log(Level.SEVERE, "------------------------------");
                 
-                if (restart) RestartCommand.restart();
+                if (restart) RestartCommand.restart(); // GC Inlined
                 break;
             }
             

sources/src/main/java/io/akarin/server/mixin/core/DesyncCatcher.java

@@ -1,16 +0,0 @@
-package io.akarin.server.mixin.core;
-
-import org.spigotmc.AsyncCatcher;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Overwrite;
-import org.spongepowered.asm.mixin.Shadow;
-
-@Mixin(value = AsyncCatcher.class, remap = false)
-public class DesyncCatcher {
-    @Shadow public static boolean enabled;
-    
-    @Overwrite
-    public static void catchOp(String reason) {
-        ;
-    }
-}

sources/src/main/java/io/akarin/server/mixin/core/MixinAsyncCatcher.java

@@ -0,0 +1,30 @@
+package io.akarin.server.mixin.core;
+
+import org.spigotmc.AsyncCatcher;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.PersistentCollection;
+
+@Mixin(value = AsyncCatcher.class, remap = false)
+public abstract class MixinAsyncCatcher {
+    @Shadow public static boolean enabled;
+    
+    @Overwrite
+    public static void catchOp(String reason) {
+        if (enabled) {
+            if (Akari.isPrimaryThread()) return;
+            
+            if (AkarinGlobalConfig.throwOnAsyncCaught) {
+                throw new IllegalStateException("Asynchronous " + reason + "!");
+            } else {
+                Akari.logger.warn("Asynchronous " + reason + "!");
+                Thread.dumpStack();
+                PersistentCollection.class.getName();
+            }
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinChunkIOExecutor.java

@@ -12,7 +12,7 @@ import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.Chunk;
 
 @Mixin(value = ChunkIOExecutor.class, remap = false)
-public class MixinChunkIOExecutor {
+public abstract class MixinChunkIOExecutor {
     @Shadow @Final static int BASE_THREADS;
     @Shadow @Mutable @Final static int PLAYERS_PER_THREAD;
     @Shadow @Final private static AsynchronousExecutor<?, Chunk, Runnable, RuntimeException> instance;

sources/src/main/java/io/akarin/server/mixin/core/MixinChunkSection.java

@@ -0,0 +1,18 @@
+package io.akarin.server.mixin.core;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.ChunkSection;
+
+@Mixin(value = ChunkSection.class, remap = false)
+public abstract class MixinChunkSection {
+    @Shadow private int nonEmptyBlockCount;
+    
+    @Overwrite // PAIL: isEmpty
+    public boolean a() {
+        return AkarinGlobalConfig.sendLightOnlyChunkSection ? false : nonEmptyBlockCount == 0;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinCommandBan.java

@@ -0,0 +1,61 @@
+package io.akarin.server.mixin.core;
+
+import java.util.Date;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+import com.mojang.authlib.GameProfile;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.CommandAbstract;
+import net.minecraft.server.CommandBan;
+import net.minecraft.server.CommandException;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.ExceptionUsage;
+import net.minecraft.server.GameProfileBanEntry;
+import net.minecraft.server.ICommand;
+import net.minecraft.server.ICommandListener;
+import net.minecraft.server.MinecraftServer;
+
+@Mixin(value = CommandBan.class, remap = false)
+public abstract class MixinCommandBan {
+    @Overwrite
+    public void execute(MinecraftServer server, ICommandListener sender, String[] args) throws CommandException {
+        if (args.length >= 1 && args[0].length() > 1) {
+            GameProfile profile = server.getUserCache().getProfile(args[0]);
+
+            if (profile == null) {
+                throw new CommandException("commands.ban.failed", new Object[] {args[0]});
+            } else {
+                // Akarin start - use string
+                boolean hasReason = true; // Akarin
+                String message = null;
+                if (args.length >= 2) {
+                    message = "";
+                    for (int i = 2; i < args.length; i++) {
+                        message = message + args[i];
+                    }
+                } else {
+                    hasReason = false; // Akarin
+                    message = Akari.EMPTY_STRING; // Akarin - modify message
+                }
+                // Akarin end
+                
+                GameProfileBanEntry entry = new GameProfileBanEntry(profile, (Date) null, sender.getName(), (Date) null, message);
+                
+                server.getPlayerList().getProfileBans().add(entry);
+                EntityPlayer entityplayer = server.getPlayerList().getPlayer(args[0]);
+                
+                if (entityplayer != null) {
+                    entityplayer.playerConnection.disconnect(hasReason ? message : AkarinGlobalConfig.messageBan);
+                }
+                
+                CommandAbstract.a(sender, (ICommand) this, "commands.ban.success", args[0]); // PAIL: notifyCommandListener
+            }
+        } else {
+            throw new ExceptionUsage("commands.ban.usage");
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinCommandBanIp.java

@@ -0,0 +1,49 @@
+package io.akarin.server.mixin.core;
+
+import java.util.Date;
+import java.util.List;
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.CommandAbstract;
+import net.minecraft.server.CommandBanIp;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.ICommand;
+import net.minecraft.server.ICommandListener;
+import net.minecraft.server.IpBanEntry;
+import net.minecraft.server.MinecraftServer;
+
+@Mixin(value = CommandBanIp.class, remap = false)
+public abstract class MixinCommandBanIp {
+    @Overwrite // PAIL: banIp
+    protected void a(MinecraftServer server, ICommandListener sender, String args, @Nullable String banReason) {
+        // Akarin start - modify message
+        boolean hasReason = true;
+        if (banReason == null) {
+            banReason = Akari.EMPTY_STRING;
+            hasReason = false;
+        }
+        // Akarin end
+        IpBanEntry ipbanentry = new IpBanEntry(args, (Date) null, sender.getName(), (Date) null, banReason);
+
+        server.getPlayerList().getIPBans().add(ipbanentry);
+        List<EntityPlayer> withIpPlayers = server.getPlayerList().b(args); // PAIL: getPlayersMatchingAddress
+        String[] banPlayerNames = new String[withIpPlayers.size()];
+        
+        for (int i = 0; i < banPlayerNames.length; i++) {
+            EntityPlayer each = withIpPlayers.get(i);
+            banPlayerNames[i] = each.getName();
+            each.playerConnection.disconnect(hasReason ? banReason : AkarinGlobalConfig.messageBanIp); // Akarin
+        }
+        
+        if (withIpPlayers.isEmpty()) {
+            CommandAbstract.a(sender, (ICommand) this, "commands.banip.success", args); // PAIL: notifyCommandListener
+        } else {
+            CommandAbstract.a(sender, (ICommand) this, "commands.banip.success.players", args, CommandAbstract.a(banPlayerNames)); // PAIL: notifyCommandListener - joinNiceString
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinCommandKick.java

@@ -0,0 +1,44 @@
+package io.akarin.server.mixin.core;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.CommandAbstract;
+import net.minecraft.server.CommandException;
+import net.minecraft.server.CommandKick;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.ExceptionPlayerNotFound;
+import net.minecraft.server.ExceptionUsage;
+import net.minecraft.server.ICommand;
+import net.minecraft.server.ICommandListener;
+import net.minecraft.server.MinecraftServer;
+
+@Mixin(value = CommandKick.class, remap = false)
+public abstract class MixinCommandKick {
+    @Overwrite
+    public void execute(MinecraftServer server, ICommandListener sender, String[] args) throws CommandException {
+        if (args.length > 0 && args[0].length() > 1) {
+            EntityPlayer target = server.getPlayerList().getPlayer(args[0]);
+
+            if (target == null) {
+                throw new ExceptionPlayerNotFound("commands.generic.player.notFound", args[0]);
+            } else {
+                if (args.length >= 2) {
+                    // Akarin start - use string
+                    String message = "";
+                    for (int i = 2; i < args.length; i++) {
+                        message = message + args[i];
+                    }
+                    target.playerConnection.disconnect(message);
+                    CommandAbstract.a(sender, (ICommand) this, "commands.kick.success.reason", target.getName(), message); // PAIL: notifyCommandListener
+                    // Akarin end
+                } else {
+                    target.playerConnection.disconnect(AkarinGlobalConfig.messageKick); // Akarin
+                    CommandAbstract.a(sender, (ICommand) this, "commands.kick.success", target.getName()); // PAIL: notifyCommandListener
+                }
+            }
+        } else {
+            throw new ExceptionUsage("commands.kick.usage");
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinCraftServer.java

@@ -7,19 +7,40 @@ import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 
+import io.akarin.api.internal.Akari;
+import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.MinecraftServer;
+
 @Mixin(value = CraftServer.class, remap = false)
-public class MixinCraftServer {
+public abstract class MixinCraftServer {
     @Shadow @Final @Mutable private String serverName;
+    @Shadow @Final @Mutable private String serverVersion;
+    @Shadow @Final protected MinecraftServer console;
     private boolean needApplyServerName = true;
+    private boolean needApplyServerVersion = true;
     
     @Overwrite
     public String getName() {
         // We cannot apply the name modification in <init> method,
         // cause the initializer will be added to the tail
         if (needApplyServerName) {
-            serverName = "Akarin";
+            serverName = AkarinGlobalConfig.serverBrandName.equals(Akari.EMPTY_STRING) ? "Akarin" : AkarinGlobalConfig.serverBrandName;
             needApplyServerName = false;
         }
         return serverName;
     }
+    
+    @Overwrite
+    public String getVersion() {
+        if (needApplyServerVersion) {
+            serverVersion = AkarinGlobalConfig.serverBrandName.equals(Akari.EMPTY_STRING) ? serverVersion : serverVersion.replace("Akarin", AkarinGlobalConfig.serverBrandName);
+            needApplyServerVersion = false;
+        }
+        return serverVersion + " (MC: " + console.getVersion() + ")";
+    }
+    
+    @Overwrite
+    public boolean isPrimaryThread() {
+        return Akari.isPrimaryThread();
+    }
 }

sources/src/main/java/io/akarin/server/mixin/core/MixinMCUtil.java

@@ -1,16 +1,38 @@
 package io.akarin.server.mixin.core;
 
+import java.util.concurrent.ExecutionException;
 import java.util.function.Supplier;
 
+import org.bukkit.craftbukkit.util.Waitable;
+import org.spigotmc.AsyncCatcher;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
 
+import io.akarin.api.internal.Akari;
 import net.minecraft.server.MCUtil;
+import net.minecraft.server.MinecraftServer;
 
 @Mixin(value = MCUtil.class, remap = false)
-public class MixinMCUtil {
+public abstract class MixinMCUtil {
     @Overwrite
     public static <T> T ensureMain(String reason, Supplier<T> run) {
+        if (AsyncCatcher.enabled && !Akari.isPrimaryThread()) {
+            new IllegalStateException("Asynchronous " + reason + "! Blocking thread until it returns ").printStackTrace();
+            Waitable<T> wait = new Waitable<T>() {
+                @Override
+                protected T evaluate() {
+                    return run.get();
+                }
+            };
+            MinecraftServer.getServer().processQueue.add(wait);
+            try {
+                return wait.get();
+            } catch (InterruptedException | ExecutionException e) {
+                e.printStackTrace();
+            }
+            return null;
+        }
+        
         return run.get();
     }
 }

sources/src/main/java/io/akarin/server/mixin/core/MixinMinecraftServer.java

@@ -2,10 +2,13 @@ package io.akarin.server.mixin.core;
 
 import java.util.List;
 import java.util.Queue;
+import java.util.concurrent.ExecutorCompletionService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.FutureTask;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.chunkio.ChunkIOExecutor;
 import org.bukkit.event.inventory.InventoryMoveItemEvent;
+import org.bukkit.event.world.WorldLoadEvent;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
@@ -16,9 +19,12 @@ import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 import co.aikar.timings.MinecraftTimings;
-import io.akarin.api.Akari;
+import io.akarin.api.internal.Akari;
+import io.akarin.api.internal.Akari.AssignableFactory;
+import io.akarin.api.internal.mixin.IMixinLockProvider;
 import io.akarin.server.core.AkarinGlobalConfig;
 import io.akarin.server.core.AkarinSlackScheduler;
+import net.minecraft.server.BlockPosition;
 import net.minecraft.server.CrashReport;
 import net.minecraft.server.CustomFunctionData;
 import net.minecraft.server.ITickable;
@@ -32,12 +38,36 @@ import net.minecraft.server.TileEntityHopper;
 import net.minecraft.server.WorldServer;
 
 @Mixin(value = MinecraftServer.class, remap = false)
-public class MixinMinecraftServer {
+public abstract class MixinMinecraftServer {
+    @Shadow @Final public Thread primaryThread;
+    
     @Overwrite
     public String getServerModName() {
         return "Akarin";
     }
     
+    @Inject(method = "run()V", at = @At(
+            value = "INVOKE",
+            target = "net/minecraft/server/MinecraftServer.aw()J",
+            shift = At.Shift.BEFORE
+    ))
+    private void prerun(CallbackInfo info) {
+        primaryThread.setPriority(AkarinGlobalConfig.primaryThreadPriority < Thread.NORM_PRIORITY ? Thread.NORM_PRIORITY :
+            (AkarinGlobalConfig.primaryThreadPriority > Thread.MAX_PRIORITY ? 10 : AkarinGlobalConfig.primaryThreadPriority));
+        
+        for (int i = 0; i < worlds.size(); ++i) {
+            WorldServer world = worlds.get(i);
+            TileEntityHopper.skipHopperEvents = world.paperConfig.disableHopperMoveEvents || InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0;
+        }
+        AkarinSlackScheduler.boot();
+        
+    }
+    
+    @Overwrite
+    public boolean isMainThread() {
+        return Akari.isPrimaryThread();
+    }
+    
     /*
      * Forcely disable snooper
      */
@@ -47,33 +77,71 @@ public class MixinMinecraftServer {
     @Overwrite
     public void b(MojangStatisticsGenerator generator) {}
     
-    @Inject(method = "run()V", at = @At(
-            value = "INVOKE",
-            target = "net/minecraft/server/MinecraftServer.aw()J",
-            shift = At.Shift.BEFORE
-    ))
-    private void prerun(CallbackInfo info) {
-        for (int i = 0; i < worlds.size(); ++i) {
-            WorldServer world = worlds.get(i);
-            TileEntityHopper.skipHopperEvents = world.paperConfig.disableHopperMoveEvents || InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0;
-        }
+    /*
+     * Parallel spawn chunks generation
+     */
+    @Shadow public abstract boolean isRunning();
+    @Shadow(aliases = "a_") protected abstract void output(String s, int i);
+    @Shadow(aliases = "t") protected abstract void enablePluginsPostWorld();
+    
+    private void prepareChunks(WorldServer world, int index) {
+        MinecraftServer.LOGGER.info("Preparing start region for level " + index + " (Seed: " + world.getSeed() + ")");
+        BlockPosition spawnPos = world.getSpawn();
+        long lastRecord = System.currentTimeMillis();
         
-        AkarinSlackScheduler.boot();
+        int preparedChunks = 0;
+        short radius = world.paperConfig.keepLoadedRange;
+        for (int skipX = -radius; skipX <= radius && isRunning(); skipX += 16) {
+            for (int skipZ = -radius; skipZ <= radius && isRunning(); skipZ += 16) {
+                long now = System.currentTimeMillis();
+                
+                if (now - lastRecord > 1000L) {
+                    output("Preparing spawn area (level " + index + ") ", preparedChunks * 100 / 625);
+                    lastRecord = now;
+                }
+                
+                preparedChunks++;
+                world.getChunkProviderServer().getChunkAt(spawnPos.getX() + skipX >> 4, spawnPos.getZ() + skipZ >> 4);
+            }
+        }
     }
     
+    @Overwrite
+    protected void l() throws InterruptedException {
+        ExecutorCompletionService<?> executor = new ExecutorCompletionService<>(Executors.newFixedThreadPool(worlds.size(), new AssignableFactory()));
+        
+        for (int index = 0; index < worlds.size(); index++) {
+            WorldServer world = this.worlds.get(index);
+            if (!world.getWorld().getKeepSpawnInMemory()) continue;
+            
+            int fIndex = index;
+            executor.submit(() -> prepareChunks(world, fIndex), null);
+        }
+        
+        for (WorldServer world : this.worlds) {
+            if (world.getWorld().getKeepSpawnInMemory()) executor.take();
+            this.server.getPluginManager().callEvent(new WorldLoadEvent(world.getWorld()));
+        }
+        
+        enablePluginsPostWorld();
+    }
+    
+    /*
+     * Parallel world ticking
+     */
     @Shadow public CraftServer server;
     @Shadow @Mutable protected Queue<FutureTask<?>> j;
     @Shadow public Queue<Runnable> processQueue;
     @Shadow private int ticks;
     @Shadow public List<WorldServer> worlds;
-    @Shadow private PlayerList v;
-    @Shadow @Final private List<ITickable> o;
+    @Shadow(aliases = "v") private PlayerList playerList;
+    @Shadow(aliases = "o") @Final private List<ITickable> tickables;
     
-    @Shadow public PlayerList getPlayerList() { return null; }
-    @Shadow public ServerConnection an() { return null; }
-    @Shadow public CustomFunctionData aL() { return null; }
+    @Shadow public abstract PlayerList getPlayerList();
+    @Shadow(aliases = "an") public abstract ServerConnection serverConnection();
+    @Shadow(aliases = "aL") public abstract CustomFunctionData functionManager();
     
-    private void tickEntities(WorldServer world) {
+    private boolean tickEntities(WorldServer world) {
         try {
             world.tickEntities();
         } catch (Throwable throwable) {
@@ -86,6 +154,7 @@ public class MixinMinecraftServer {
             world.a(crashreport);
             throw new ReportedException(crashreport);
         }
+        return true;
     }
     
     private void tickWorld(WorldServer world) {
@@ -106,10 +175,6 @@ public class MixinMinecraftServer {
     @Overwrite
     public void D() throws InterruptedException {
         Runnable runnable;
-        Akari.callbackTiming.startTiming();
-        while ((runnable = Akari.callbackQueue.poll()) != null) runnable.run();
-        Akari.callbackTiming.stopTiming();
-        
         MinecraftTimings.bukkitSchedulerTimer.startTiming();
         this.server.getScheduler().mainThreadHeartbeat(this.ticks);
         MinecraftTimings.bukkitSchedulerTimer.stopTiming();
@@ -137,13 +202,11 @@ public class MixinMinecraftServer {
                 worlds.get(i).timings.doTick.startTiming();
             }
         }
-        Akari.silentTiming = true; // Disable timings
         Akari.STAGE_TICK.submit(() -> {
             // Never tick one world concurrently!
-            // TODO better treat world index
             for (int i = 1; i <= worlds.size(); ++i) {
                 WorldServer world = worlds.get(i < worlds.size() ? i : 0);
-                synchronized (world.tickLock) {
+                synchronized (((IMixinLockProvider) world).lock()) {
                     tickEntities(world);
                 }
             }
@@ -151,13 +214,15 @@ public class MixinMinecraftServer {
         
         for (int i = 0; i < worlds.size(); ++i) {
             WorldServer world = worlds.get(i);
-            synchronized (world.tickLock) {
+            synchronized (((IMixinLockProvider) world).lock()) {
                 tickWorld(world);
             }
         }
         
+        Akari.entityCallbackTiming.startTiming();
         Akari.STAGE_TICK.take();
-        Akari.silentTiming = false; // Enable timings
+        Akari.entityCallbackTiming.stopTiming();
+        
         Akari.worldTiming.stopTiming();
         if (AkarinGlobalConfig.legacyWorldTimings) {
             for (int i = 0; i < worlds.size(); ++i) {
@@ -172,33 +237,34 @@ public class MixinMinecraftServer {
         
         for (int i = 0; i < worlds.size(); ++i) {
             WorldServer world = worlds.get(i);
-            tickConflictSync(world);
+            tickUnsafeSync(world);
             
             world.getTracker().updatePlayers();
             world.explosionDensityCache.clear(); // Paper - Optimize explosions
         }
         
         MinecraftTimings.connectionTimer.startTiming();
-        this.an().c();
+        serverConnection().c();
         MinecraftTimings.connectionTimer.stopTiming();
         
-        MinecraftTimings.playerListTimer.startTiming();
-        this.v.tick();
-        MinecraftTimings.playerListTimer.stopTiming();
+        Akari.callbackTiming.startTiming();
+        while ((runnable = Akari.callbackQueue.poll()) != null) runnable.run();
+        Akari.callbackTiming.stopTiming();
         
         MinecraftTimings.commandFunctionsTimer.startTiming();
-        this.aL().e();
+        functionManager().e();
         MinecraftTimings.commandFunctionsTimer.stopTiming();
         
         MinecraftTimings.tickablesTimer.startTiming();
-        for (int i = 0; i < this.o.size(); ++i) {
-            this.o.get(i).e();
+        for (int i = 0; i < this.tickables.size(); ++i) {
+            tickables.get(i).e();
         }
         MinecraftTimings.tickablesTimer.stopTiming();
     }
     
-    public void tickConflictSync(WorldServer world) {
-        ;
+    public void tickUnsafeSync(WorldServer world) {
+        world.timings.doChunkMap.startTiming();
+        world.manager.flush();
+        world.timings.doChunkMap.stopTiming();
     }
-    
 }

sources/src/main/java/io/akarin/server/mixin/core/MixinPlayerConnectionUtils.java

@@ -0,0 +1,29 @@
+package io.akarin.server.mixin.core;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import co.aikar.timings.MinecraftTimings;
+import co.aikar.timings.Timing;
+import io.akarin.api.internal.Akari;
+import net.minecraft.server.CancelledPacketHandleException;
+import net.minecraft.server.IAsyncTaskHandler;
+import net.minecraft.server.Packet;
+import net.minecraft.server.PacketListener;
+import net.minecraft.server.PlayerConnectionUtils;
+
+@Mixin(value = PlayerConnectionUtils.class, remap = false)
+public abstract class MixinPlayerConnectionUtils {
+    @Overwrite
+    public static <T extends PacketListener> void ensureMainThread(final Packet<T> packet, final T listener, IAsyncTaskHandler iasynctaskhandler) throws CancelledPacketHandleException {
+        if (!iasynctaskhandler.isMainThread()) {
+            Timing timing = MinecraftTimings.getPacketTiming(packet);
+            // MinecraftServer#postToMainThread inlined thread check, no twice
+            Akari.callbackQueue.add(() -> {
+                try (Timing ignored = timing.startTiming()) {
+                    packet.a(listener);
+                }
+            });
+            throw CancelledPacketHandleException.INSTANCE;
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinPlayerList.java

@@ -0,0 +1,12 @@
+package io.akarin.server.mixin.core;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+import net.minecraft.server.PlayerList;
+
+@Mixin(value = PlayerList.class, remap = false)
+public abstract class MixinPlayerList {
+    @Overwrite
+    public void tick() {} // Migrated to slack service
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinTimingHandler.java

@@ -7,47 +7,64 @@ import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
-import io.akarin.api.Akari;
+import co.aikar.timings.Timing;
+import io.akarin.api.internal.Akari;
+import io.akarin.api.internal.Akari.AssignableThread;
 import io.akarin.server.core.AkarinGlobalConfig;
+import net.minecraft.server.MinecraftServer;
 
 @Mixin(targets = "co.aikar.timings.TimingHandler", remap = false)
-public class MixinTimingHandler {
+public abstract class MixinTimingHandler {
     @Shadow @Final String name;
     @Shadow private boolean enabled;
     @Shadow private volatile long start;
     @Shadow private volatile int timingDepth;
     
+    @Shadow abstract void addDiff(long diff);
+    @Shadow public abstract Timing startTiming();
+    
+    @Overwrite
+    public Timing startTimingIfSync() {
+        if (Akari.isPrimaryThread(false)) {
+            startTiming();
+        }
+        return (Timing) this;
+    }
+    
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    @Inject(method = "startTiming", at = @At("HEAD"), cancellable = true)
+    public void onStartTiming(CallbackInfoReturnable ci) {
+        if (!Akari.isPrimaryThread(false)) ci.setReturnValue(this); // Avoid modify any field
+    }
+    
     @Overwrite
     public void stopTimingIfSync() {
-        if (Bukkit.isPrimaryThread()) {
+        if (Akari.isPrimaryThread(false)) {
             stopTiming(true); // Avoid twice thread check
         }
     }
     
     @Overwrite
     public void stopTiming() {
-        // Akarin start - avoid twice thread check
         stopTiming(false);
     }
     
-    @Shadow void addDiff(long diff) {}
-    
-    public void stopTiming(boolean sync) {
-        if (enabled && --timingDepth == 0 && start != 0) {
-            if (Akari.silentTiming) { // It must be off-main thread now
-                start = 0;
-                return;
-            } else {
-                if (!sync && !Bukkit.isPrimaryThread()) {
-                    if (AkarinGlobalConfig.silentAsyncTimings) {
-                        Bukkit.getLogger().log(Level.SEVERE, "stopTiming called async for " + name);
-                        new Throwable().printStackTrace();
-                    }
-                    start = 0;
-                    return;
-                }
-            }
+    public void stopTiming(boolean alreadySync) {
+        Thread curThread = Thread.currentThread();
+        if (!enabled || curThread instanceof AssignableThread) return;
+        if (!alreadySync && curThread != MinecraftServer.getServer().primaryThread) {
+            if (AkarinGlobalConfig.silentAsyncTimings) return;
+            
+            Bukkit.getLogger().log(Level.SEVERE, "stopTiming called async for " + name);
+            Thread.dumpStack();
+        }
+        
+        // Main thread ensured
+        if (--timingDepth == 0 && start != 0) {
             addDiff(System.nanoTime() - start);
             start = 0;
         }

sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java

@@ -9,12 +9,12 @@ import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 
-import io.akarin.api.Akari;
+import io.akarin.api.internal.Akari;
 import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.MCUtil;
 
 @Mixin(value = VersionCommand.class, remap = false)
-public class MixinVersionCommand {
+public abstract class MixinVersionCommand {
     @Shadow private static int getFromRepo(String repo, String hash) { return 0; }
     
     /**
@@ -70,7 +70,7 @@ public class MixinVersionCommand {
         
         if (hasVersion) {
             long current = System.currentTimeMillis();
-            if (current - lastCheckMillis > 7200000 /* 2 hours */) {
+            if (current - lastCheckMillis > AkarinGlobalConfig.versionUpdateInterval) {
                 lastCheckMillis = current;
                 hasVersion = false;
             } else {
@@ -104,7 +104,7 @@ public class MixinVersionCommand {
             versionWaiters.add(sender);
             sender.sendMessage("Checking version, please wait...");
             
-            String version = Bukkit.getVersion();
+            String version = Akari.getServerVersion();
             if (version == null) {
                 version = "Unique"; // Custom - > Unique
                 customVersion = true;

sources/src/main/java/io/akarin/server/mixin/core/MixinWorld.java

@@ -0,0 +1,34 @@
+package io.akarin.server.mixin.core;
+
+import java.util.List;
+
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import net.minecraft.server.AxisAlignedBB;
+import net.minecraft.server.Entity;
+import net.minecraft.server.World;
+
+/**
+ * Fixes MC-103516(https://bugs.mojang.com/browse/MC-103516)
+ */
+@Mixin(value = World.class, remap = false)
+public abstract class MixinWorld {
+    @Shadow public abstract List<Entity> getEntities(@Nullable Entity entity, AxisAlignedBB box);
+    
+    /**
+     * Returns true if there are no solid, live entities in the specified AxisAlignedBB, excluding the given entity
+     */
+    public boolean a(AxisAlignedBB box, @Nullable Entity target) { // PAIL: checkNoEntityCollision
+        List<Entity> list = this.getEntities(null, box);
+        
+        for (Entity each : list) {
+            if (!each.dead && each.i && each != target && (target == null || !each.x(target))) { // PAIL: preventEntitySpawning - isRidingSameEntity
+                return false;
+            }
+        }
+        return true;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MixinWorldServer.java

@@ -0,0 +1,24 @@
+package io.akarin.server.mixin.core;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinLockProvider;
+import net.minecraft.server.WorldServer;
+
+@Mixin(value = WorldServer.class, remap = false)
+public abstract class MixinWorldServer implements IMixinLockProvider {
+    @Redirect(method = "doTick", at = @At(
+            value = "INVOKE",
+            target = "net/minecraft/server/PlayerChunkMap.flush()V"
+    ))
+    public void onFlush() {} // Migrated to main thread
+    
+    private final Object tickLock = new Object();
+
+    @Override
+    public Object lock() {
+        return tickLock;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/core/MonsterEggGuardian.java

@@ -11,8 +11,7 @@ import net.minecraft.server.Blocks;
 import net.minecraft.server.ItemMonsterEgg;
 
 @Mixin(value = ItemMonsterEgg.class, remap = false)
-public class MonsterEggGuardian {
-    
+public abstract class MonsterEggGuardian {
     @Redirect(method = "a", at = @At(
             value = "FIELD",
             target = "net/minecraft/server/Blocks.MOB_SPAWNER:Lnet/minecraft/server/Block;",

sources/src/main/java/io/akarin/server/mixin/cps/MixinChunk.java

@@ -0,0 +1,130 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.cps;
+
+import java.util.List;
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.google.common.collect.Lists;
+
+import io.akarin.api.internal.mixin.IMixinChunk;
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.EnumDirection;
+import net.minecraft.server.MCUtil;
+import net.minecraft.server.World;
+
+@Mixin(value = Chunk.class, remap = false)
+public abstract class MixinChunk implements IMixinChunk {
+    private Chunk[] neighborChunks = new Chunk[4];
+    private static final EnumDirection[] CARDINAL_DIRECTIONS = new EnumDirection[] {EnumDirection.NORTH, EnumDirection.SOUTH, EnumDirection.EAST, EnumDirection.WEST};
+    
+    @Shadow @Final public World world;
+    @Shadow @Final public int locX;
+    @Shadow @Final public int locZ;
+    
+    @Override
+    public Chunk getNeighborChunk(int index) {
+        return this.neighborChunks[index];
+    }
+    
+    @Override
+    public void setNeighborChunk(int index, @Nullable Chunk chunk) {
+        this.neighborChunks[index] = chunk;
+    }
+    
+    @Override
+    public List<Chunk> getNeighbors() {
+        List<Chunk> neighborList = Lists.newArrayList();
+        for (Chunk neighbor : this.neighborChunks) {
+            if (neighbor != null) {
+                neighborList.add(neighbor);
+            }
+        }
+        return neighborList;
+    }
+    
+    @Override
+    public boolean areNeighborsLoaded() {
+        for (int i = 0; i < 4; i++) {
+            if (this.neighborChunks[i] == null) {
+                return false;
+            }
+        }
+        return true;
+    }
+    
+    private static int directionToIndex(EnumDirection direction) {
+        switch (direction) {
+            case NORTH:
+                return 0;
+            case SOUTH:
+                return 1;
+            case EAST:
+                return 2;
+            case WEST:
+                return 3;
+            default:
+                throw new IllegalArgumentException("Unexpected direction");
+        }
+    }
+    
+    @Inject(method = "addEntities", at = @At("RETURN"))
+    public void onLoadReturn(CallbackInfo ci) {
+        BlockPosition origin = new BlockPosition(locX, 0, locZ);
+        for (EnumDirection direction : CARDINAL_DIRECTIONS) {
+            BlockPosition shift = origin.shift(direction);
+            Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(world.getChunkProvider(), shift.getX(), shift.getZ());
+            if (neighbor != null) {
+                int neighborIndex = directionToIndex(direction);
+                int oppositeNeighborIndex = directionToIndex(direction.opposite());
+                this.setNeighborChunk(neighborIndex, neighbor);
+                ((IMixinChunk) neighbor).setNeighborChunk(oppositeNeighborIndex, (Chunk) (Object) this);
+            }
+        }
+    }
+    
+    @Inject(method = "removeEntities", at = @At("RETURN"))
+    public void onUnload(CallbackInfo ci) {
+        BlockPosition origin = new BlockPosition(locX, 0, locZ);
+        for (EnumDirection direction : CARDINAL_DIRECTIONS) {
+            BlockPosition shift = origin.shift(direction);
+            Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(world.getChunkProvider(), shift.getX(), shift.getZ());
+            if (neighbor != null) {
+                int neighborIndex = directionToIndex(direction);
+                int oppositeNeighborIndex = directionToIndex(direction.opposite());
+                this.setNeighborChunk(neighborIndex, null);
+                ((IMixinChunk) neighbor).setNeighborChunk(oppositeNeighborIndex, null);
+            }
+        }
+    }
+}

sources/src/main/java/io/akarin/server/mixin/cps/MixinChunkProviderServer.java

@@ -0,0 +1,87 @@
+package io.akarin.server.mixin.cps;
+
+import org.spigotmc.SlackActivityAccountant;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import it.unimi.dsi.fastutil.longs.Long2ObjectMap.Entry;
+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectIterator;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.ChunkProviderServer;
+import net.minecraft.server.IChunkLoader;
+import net.minecraft.server.WorldServer;
+
+@Mixin(value = ChunkProviderServer.class, remap = false)
+public abstract class MixinChunkProviderServer {
+    @Shadow @Final public WorldServer world;
+    @Shadow public Long2ObjectOpenHashMap<Chunk> chunks;
+    
+    public void unload(Chunk chunk) {
+        if (this.world.worldProvider.c(chunk.locX, chunk.locZ)) {
+            // Akarin - avoid using the queue and simply check the unloaded flag during unloads
+            // this.unloadQueue.add(Long.valueOf(ChunkCoordIntPair.a(chunk.locX, chunk.locZ)));
+            chunk.setShouldUnload(true);
+        }
+    }
+    
+    @Shadow public abstract boolean unloadChunk(Chunk chunk, boolean save);
+    @Shadow @Final private IChunkLoader chunkLoader;
+    @Shadow @Final private static double UNLOAD_QUEUE_RESIZE_FACTOR;
+    
+    @Overwrite
+    public boolean unloadChunks() {
+        if (!this.world.savingDisabled) {
+            long now = System.currentTimeMillis();
+            long unloadAfter = world.paperConfig.delayChunkUnloadsBy;
+            SlackActivityAccountant activityAccountant = world.getMinecraftServer().slackActivityAccountant;
+            activityAccountant.startActivity(0.5);
+            ObjectIterator<Entry<Chunk>> it = chunks.long2ObjectEntrySet().fastIterator();
+            int remainingChunks = chunks.size();
+            int targetSize = Math.min(remainingChunks - 100,  (int) (remainingChunks * UNLOAD_QUEUE_RESIZE_FACTOR)); // Paper - Make more aggressive
+            
+            while (it.hasNext()) {
+                Entry<Chunk> entry = it.next();
+                Chunk chunk = entry.getValue();
+                if (chunk == null) continue;
+                
+                if (chunk.isUnloading()) {
+                    if (chunk.scheduledForUnload != null) {
+                        if (now - chunk.scheduledForUnload > unloadAfter) {
+                            chunk.scheduledForUnload = null;
+                        } else continue;
+                    }
+                    
+                    if (!unloadChunk(chunk, true)) { // Event cancelled
+                        // If a plugin cancelled it, we shouldn't trying unload it for a while
+                        chunk.setShouldUnload(false);
+                        continue;
+                    }
+                    
+                    it.remove();
+                    if (--remainingChunks <= targetSize || activityAccountant.activityTimeIsExhausted()) break; // more slack since the target size not work as intended
+                }
+            }
+            activityAccountant.endActivity();
+            this.chunkLoader.b(); // PAIL: chunkTick
+        }
+        return false;
+    }
+    
+    @Redirect(method = "unloadChunk", at = @At(
+            value = "INVOKE",
+            target = "it/unimi/dsi/fastutil/longs/Long2ObjectOpenHashMap.remove(J)Ljava/lang/Object;"
+    ))
+    private Object remove(Long2ObjectOpenHashMap<Chunk> chunks, long chunkHash) {
+        return null;
+    }
+    
+    @Overwrite
+    public String getName() {
+        return "ServerChunkCache: " + chunks.size();
+    }
+}

sources/src/main/java/io/akarin/server/mixin/cps/MixinCraftWorld.java

@@ -0,0 +1,39 @@
+package io.akarin.server.mixin.cps;
+
+import java.util.Set;
+
+import org.bukkit.craftbukkit.CraftWorld;
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import net.minecraft.server.Chunk;
+import net.minecraft.server.WorldServer;
+
+@Mixin(value = CraftWorld.class, remap = false)
+public abstract class MixinCraftWorld {
+    @Shadow @Final private WorldServer world;
+    
+    @Redirect(method = "processChunkGC()V", at = @At(
+            value = "INVOKE",
+            target = "java/util/Set.contains(Ljava/lang/Object;)Z",
+            opcode = Opcodes.INVOKEINTERFACE
+    ))
+    public boolean checkUnloading(Set<Long> set, Object chunkHash) {
+        return false;
+    }
+    
+    @Redirect(method = "regenerateChunk", at = @At(
+            value = "INVOKE",
+            target = "java/util/Set.remove(Ljava/lang/Object;)Z",
+            opcode = Opcodes.INVOKEINTERFACE
+    ))
+    public boolean regenChunk(Set<Long> set, Object chunkHash) {
+        Chunk chunk = world.getChunkProviderServer().chunks.get(chunkHash);
+        if (chunk != null) chunk.setShouldUnload(false);
+        return true;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunk.java

@@ -0,0 +1,640 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.lighting;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.google.common.collect.Lists;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.api.internal.mixin.IMixinChunk;
+import io.akarin.api.internal.mixin.IMixinWorldServer;
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.Blocks;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.ChunkSection;
+import net.minecraft.server.EnumDirection;
+import net.minecraft.server.EnumSkyBlock;
+import net.minecraft.server.IBlockData;
+import net.minecraft.server.MCUtil;
+import net.minecraft.server.TileEntity;
+import net.minecraft.server.World;
+import net.minecraft.server.BlockPosition.MutableBlockPosition;
+
+@Mixin(value = Chunk.class, remap = false, priority = 1001)
+public abstract class MixinChunk implements IMixinChunk {
+    
+    // Keeps track of block positions in this chunk currently queued for sky light update
+    private CopyOnWriteArrayList<Short> queuedSkyLightingUpdates = new CopyOnWriteArrayList<>();
+    // Keeps track of block positions in this chunk currently queued for block light update
+    private CopyOnWriteArrayList<Short> queuedBlockLightingUpdates = new CopyOnWriteArrayList<>();
+    private AtomicInteger pendingLightUpdates = new AtomicInteger();
+    private long lightUpdateTime;
+    private ExecutorService lightExecutorService;
+    
+    @Shadow(aliases = "m") private boolean isGapLightingUpdated;
+    @Shadow(aliases = "r") private boolean ticked;
+    @Shadow @Final private ChunkSection[] sections;
+    @Shadow @Final public int locX;
+    @Shadow @Final public int locZ;
+    @Shadow @Final public World world;
+    @Shadow @Final public int[] heightMap;
+    /** Which columns need their skylightMaps updated. */
+    @Shadow(aliases = "i") @Final private boolean[] updateSkylightColumns;
+    /** Queue containing the BlockPosition of tile entities queued for creation */
+    @Shadow(aliases = "y") @Final private ConcurrentLinkedQueue<BlockPosition> tileEntityPosQueue;
+    /** Boolean value indicating if the terrain is populated. */
+    @Shadow(aliases = "done") private boolean isTerrainPopulated;
+    @Shadow(aliases = "lit") private boolean isLightPopulated;
+    /** Lowest value in the heightmap. */
+    @Shadow(aliases = "v") private int heightMapMinimum;
+    
+    @Shadow(aliases = "b") public abstract int getHeightValue(int x, int z);
+    @Shadow(aliases = "g") @Nullable public abstract TileEntity createNewTileEntity(BlockPosition pos);
+    @Shadow(aliases = "a") @Nullable public abstract TileEntity getTileEntity(BlockPosition pos, Chunk.EnumTileEntityState state);
+    @Shadow @Final public abstract IBlockData getBlockData(BlockPosition pos);
+    @Shadow @Final public abstract IBlockData getBlockData(int x, int y, int z);
+    @Shadow public abstract boolean isUnloading();
+    /** Checks the height of a block next to a sky-visible block and schedules a lighting update as necessary */
+    @Shadow(aliases = "b") public abstract void checkSkylightNeighborHeight(int x, int z, int maxValue);
+    @Shadow(aliases = "a") public abstract void updateSkylightNeighborHeight(int x, int z, int startY, int endY);
+    @Shadow(aliases = "z") public abstract void setSkylightUpdated();
+    @Shadow(aliases = "g") public abstract int getTopFilledSegment();
+    @Shadow public abstract void markDirty();
+    
+    @Inject(method = "<init>", at = @At("RETURN"))
+    public void onConstruct(World worldIn, int x, int z, CallbackInfo ci) {
+        lightExecutorService = ((IMixinWorldServer) worldIn).getLightingExecutor();
+    }
+    
+    @Override
+    public AtomicInteger getPendingLightUpdates() {
+        return this.pendingLightUpdates;
+    }
+    
+    @Override
+    public long getLightUpdateTime() {
+        return this.lightUpdateTime;
+    }
+    
+    @Override
+    public void setLightUpdateTime(long time) {
+        this.lightUpdateTime = time;
+    }
+    
+    @Inject(method = "b(Z)V", at = @At("HEAD"), cancellable = true)
+    private void onTickHead(boolean skipRecheckGaps, CallbackInfo ci) {
+        final List<Chunk> neighbors = this.getSurroundingChunks();
+        if (this.isGapLightingUpdated && this.world.worldProvider.m() && !skipRecheckGaps && !neighbors.isEmpty()) { // PAIL: hasSkyLight
+            lightExecutorService.execute(() -> {
+                this.recheckGapsAsync(neighbors);
+            });
+            this.isGapLightingUpdated = false;
+        }
+        
+        this.ticked = true;
+        
+        if (!this.isLightPopulated && this.isTerrainPopulated && !neighbors.isEmpty()) {
+            lightExecutorService.execute(() -> {
+                this.checkLightAsync(neighbors);
+            });
+            // set to true to avoid requeuing the same task when not finished
+            this.isLightPopulated = true;
+        }
+        
+        while (!this.tileEntityPosQueue.isEmpty()) {
+            BlockPosition blockpos = this.tileEntityPosQueue.poll();
+            
+            if (this.getTileEntity(blockpos, Chunk.EnumTileEntityState.CHECK) == null && this.getBlockData(blockpos).getBlock().isTileEntity()) { // PAIL: getTileEntity
+                TileEntity tileentity = this.createNewTileEntity(blockpos);
+                this.world.setTileEntity(blockpos, tileentity);
+                this.world.b(blockpos, blockpos); // PAIL: markBlockRangeForRenderUpdate
+            }
+        }
+        ci.cancel();
+    }
+    
+    @Redirect(method = "b(III)V", at = @At(value = "INVOKE", target = "net/minecraft/server/World.getHighestBlockYAt(Lnet/minecraft/server/BlockPosition;)Lnet/minecraft/server/BlockPosition;"))
+    private BlockPosition onCheckSkylightGetHeight(World world, BlockPosition pos) {
+        final Chunk chunk = this.getLightChunk(pos.getX() >> 4, pos.getZ() >> 4, null);
+        if (chunk == null) {
+            return BlockPosition.ZERO;
+        }
+        
+        return new BlockPosition(pos.getX(), chunk.b(pos.getX() & 15, pos.getZ() & 15), pos.getZ()); // PAIL: getHeightValue
+    }
+    
+    @Redirect(method = "a(IIII)V", at = @At(value = "INVOKE", target = "net/minecraft/server/World.areChunksLoaded(Lnet/minecraft/server/BlockPosition;I)Z"))
+    private boolean onAreaLoadedSkyLightNeighbor(World world, BlockPosition pos, int radius) {
+        return this.isAreaLoaded();
+    }
+    
+    @Redirect(method = "a(IIII)V", at = @At(value = "INVOKE", target = "net/minecraft/server/World.c(Lnet/minecraft/server/EnumSkyBlock;Lnet/minecraft/server/BlockPosition;)Z"))
+    private boolean onCheckLightForSkylightNeighbor(World world, EnumSkyBlock enumSkyBlock, BlockPosition pos) {
+        return this.checkWorldLightFor(enumSkyBlock, pos);
+    }
+    
+    /**
+     * Rechecks chunk gaps async.
+     * 
+     * @param neighbors A thread-safe list of surrounding neighbor chunks
+     */
+    private void recheckGapsAsync(List<Chunk> neighbors) {
+        for (int i = 0; i < 16; ++i) {
+            for (int j = 0; j < 16; ++j) {
+                if (this.updateSkylightColumns[i + j * 16]) {
+                    this.updateSkylightColumns[i + j * 16] = false;
+                    int k = this.getHeightValue(i, j);
+                    int l = this.locX * 16 + i;
+                    int i1 = this.locZ * 16 + j;
+                    int j1 = Integer.MAX_VALUE;
+                    
+                    for (EnumDirection enumfacing : EnumDirection.EnumDirectionLimit.HORIZONTAL) {
+                        final Chunk chunk = this.getLightChunk((l + enumfacing.getAdjacentX()) >> 4, (i1 + enumfacing.getAdjacentZ()) >> 4, neighbors);
+                        if (chunk == null || chunk.isUnloading()) {
+                            continue;
+                        }
+                        j1 = Math.min(j1, chunk.w()); // PAIL: getLowestHeight
+                    }
+                    
+                    this.checkSkylightNeighborHeight(l, i1, j1);
+                    
+                    for (EnumDirection enumfacing1 : EnumDirection.EnumDirectionLimit.HORIZONTAL) {
+                        this.checkSkylightNeighborHeight(l + enumfacing1.getAdjacentX(), i1 + enumfacing1.getAdjacentZ(), k);
+                    }
+                }
+            }
+            
+            // this.isGapLightingUpdated = false;
+        }
+    }
+    
+    @Redirect(method = "n()V", at = @At(value = "INVOKE", target = "net/minecraft/server/World.getType(Lnet/minecraft/server/BlockPosition;)Lnet/minecraft/server/IBlockData;"))
+    private IBlockData onRelightChecksGetBlockData(World world, BlockPosition pos) {
+        Chunk chunk = MCUtil.getLoadedChunkWithoutMarkingActive(world.getChunkProvider(), pos.getX() >> 4, pos.getZ() >> 4);
+        
+        final IMixinChunk spongeChunk = (IMixinChunk) chunk;
+        if (chunk == null || chunk.isUnloading() || !spongeChunk.areNeighborsLoaded()) {
+            return Blocks.AIR.getBlockData();
+        }
+        
+        return chunk.getBlockData(pos);
+    }
+    
+    @Redirect(method = "n()V", at = @At(value = "INVOKE", target = "net/minecraft/server/World.w(Lnet/minecraft/server/BlockPosition;)Z"))
+    private boolean onRelightChecksCheckLight(World world, BlockPosition pos) {
+        return this.checkWorldLight(pos);
+    }
+    
+    // Avoids grabbing chunk async during light check
+    @Redirect(method = "e(II)Z", at = @At(value = "INVOKE", target = "net/minecraft/server/World.w(Lnet/minecraft/server/BlockPosition;)Z"))
+    private boolean onCheckLightWorld(World world, BlockPosition pos) {
+        return this.checkWorldLight(pos);
+    }
+    
+    @Inject(method = "o()V", at = @At("HEAD"), cancellable = true)
+    private void checkLightHead(CallbackInfo ci) {
+        if (this.world.getMinecraftServer().isStopped() || lightExecutorService.isShutdown()) {
+            return;
+        }
+        
+        if (this.isUnloading()) {
+            return;
+        }
+        final List<Chunk> neighborChunks = this.getSurroundingChunks();
+        if (neighborChunks.isEmpty()) {
+            this.isLightPopulated = false;
+            return;
+        }
+        
+        if (Akari.isPrimaryThread(false)) {
+            try {
+                lightExecutorService.execute(() -> {
+                    this.checkLightAsync(neighborChunks);
+                });
+            } catch (RejectedExecutionException ex) {
+                // This could happen if ServerHangWatchdog kills the server
+                // between the start of the method and the execute() call.
+                if (!this.world.getMinecraftServer().isStopped() && !lightExecutorService.isShutdown()) {
+                    throw ex;
+                }
+            }
+        } else {
+            this.checkLightAsync(neighborChunks);
+        }
+        ci.cancel();
+    }
+    
+    /**
+     * Checks light async.
+     * 
+     * @param neighbors A thread-safe list of surrounding neighbor chunks
+     */
+    private void checkLightAsync(List<Chunk> neighbors) {
+        this.isTerrainPopulated = true;
+        this.isLightPopulated = true;
+        BlockPosition blockpos = new BlockPosition(this.locX << 4, 0, this.locZ << 4);
+        
+        if (this.world.worldProvider.m()) { // PAIL: hasSkyLight
+            reCheckLight:
+            
+            for (int i = 0; i < 16; ++i) {
+                for (int j = 0; j < 16; ++j) {
+                    if (!this.checkLightAsync(i, j, neighbors)) {
+                        this.isLightPopulated = false;
+                        break reCheckLight;
+                    }
+                }
+            }
+            
+            if (this.isLightPopulated) {
+                for (EnumDirection enumfacing : EnumDirection.EnumDirectionLimit.HORIZONTAL) {
+                    int k = enumfacing.c() == EnumDirection.EnumAxisDirection.POSITIVE ? 16 : 1; // PAIL: getAxisDirection
+                    final BlockPosition pos = blockpos.shift(enumfacing, k);
+                    final Chunk chunk = this.getLightChunk(pos.getX() >> 4, pos.getZ() >> 4, neighbors);
+                    if (chunk == null) {
+                        continue;
+                    }
+                    chunk.checkLightSide(enumfacing.opposite());
+                }
+                
+                this.setSkylightUpdated();
+            }
+        }
+    }
+    
+    /**
+     * Checks light async.
+     * 
+     * @param x The x position of chunk
+     * @param z The z position of chunk
+     * @param neighbors A thread-safe list of surrounding neighbor chunks
+     * @return True if light update was successful, false if not
+     */
+    private boolean checkLightAsync(int x, int z, List<Chunk> neighbors) {
+        int i = this.getTopFilledSegment();
+        boolean flag = false;
+        boolean flag1 = false;
+        MutableBlockPosition blockpos$mutableblockpos = new MutableBlockPosition((this.locX << 4) + x, 0, (this.locZ << 4) + z);
+        
+        for (int j = i + 16 - 1; j > this.world.getSeaLevel() || j > 0 && !flag1; --j) {
+            blockpos$mutableblockpos.setValues(blockpos$mutableblockpos.getX(), j, blockpos$mutableblockpos.getZ());
+            int k = this.getBlockData(blockpos$mutableblockpos).c(); // PAIL: getLightOpacity
+            
+            if (k == 255 && blockpos$mutableblockpos.getY() < this.world.getSeaLevel()) {
+                flag1 = true;
+            }
+            
+            if (!flag && k > 0) {
+                flag = true;
+            } else if (flag && k == 0 && !this.checkWorldLight(blockpos$mutableblockpos, neighbors)) {
+                return false;
+            }
+        }
+        
+        for (int l = blockpos$mutableblockpos.getY(); l > 0; --l) {
+            blockpos$mutableblockpos.setValues(blockpos$mutableblockpos.getX(), l, blockpos$mutableblockpos.getZ());
+            
+            if (this.getBlockData(blockpos$mutableblockpos).d() > 0) { // getLightValue
+                this.checkWorldLight(blockpos$mutableblockpos, neighbors);
+            }
+        }
+        
+        return true;
+    }
+    
+    /**
+     * Thread-safe method to retrieve a chunk during async light updates.
+     * 
+     * @param chunkX The x position of chunk.
+     * @param chunkZ The z position of chunk.
+     * @param neighbors A thread-safe list of surrounding neighbor chunks
+     * @return The chunk if available, null if not
+     */
+    private Chunk getLightChunk(int chunkX, int chunkZ, List<Chunk> neighbors) {
+        final Chunk currentChunk = (Chunk) (Object) this;
+        if (currentChunk.a(chunkX, chunkZ)) { // PAIL: isAtLocation
+            if (currentChunk.isUnloading()) {
+                return null;
+            }
+            return currentChunk;
+        }
+        if (neighbors == null) {
+            neighbors = this.getSurroundingChunks();
+            if (neighbors.isEmpty()) {
+                return null;
+            }
+        }
+        for (Chunk neighbor : neighbors) {
+            if (neighbor.a(chunkX, chunkZ)) { // PAIL: isAtLocation
+                if (neighbor.isUnloading()) {
+                    return null;
+                }
+                return neighbor;
+            }
+        }
+
+        return null;
+    }
+    
+    /**
+     * Checks if surrounding chunks are loaded thread-safe.
+     * 
+     * @return True if surrounded chunks are loaded, false if not
+     */
+    private boolean isAreaLoaded() {
+        if (!this.areNeighborsLoaded()) {
+            return false;
+        }
+        
+        // add diagonal chunks
+        final Chunk southEastChunk = ((IMixinChunk) this.getNeighborChunk(0)).getNeighborChunk(2);
+        if (southEastChunk == null) {
+            return false;
+        }
+        
+        final Chunk southWestChunk = ((IMixinChunk) this.getNeighborChunk(0)).getNeighborChunk(3);
+        if (southWestChunk == null) {
+            return false;
+        }
+        
+        final Chunk northEastChunk = ((IMixinChunk) this.getNeighborChunk(1)).getNeighborChunk(2);
+        if (northEastChunk == null) {
+            return false;
+        }
+        
+        final Chunk northWestChunk = ((IMixinChunk) this.getNeighborChunk(1)).getNeighborChunk(3);
+        if (northWestChunk == null) {
+            return false;
+        }
+        
+        return true;
+    }
+    
+    /**
+     * Gets surrounding chunks thread-safe.
+     * 
+     * @return The list of surrounding chunks, empty list if not loaded
+     */
+    private List<Chunk> getSurroundingChunks() {
+        if (!this.areNeighborsLoaded()) {
+            return Collections.emptyList();
+        }
+        
+        // add diagonal chunks
+        final Chunk southEastChunk = ((IMixinChunk) this.getNeighborChunk(0)).getNeighborChunk(2);
+        if (southEastChunk == null) {
+            return Collections.emptyList();
+        }
+        
+        final Chunk southWestChunk = ((IMixinChunk) this.getNeighborChunk(0)).getNeighborChunk(3);
+        if (southWestChunk == null) {
+            return Collections.emptyList();
+        }
+        
+        final Chunk northEastChunk = ((IMixinChunk) this.getNeighborChunk(1)).getNeighborChunk(2);
+        if (northEastChunk == null) {
+            return Collections.emptyList();
+        }
+        
+        final Chunk northWestChunk = ((IMixinChunk) this.getNeighborChunk(1)).getNeighborChunk(3);
+        if (northWestChunk == null) {
+            return Collections.emptyList();
+        }
+        
+        List<Chunk> chunkList = Lists.newArrayList();
+        chunkList = this.getNeighbors();
+        chunkList.add(southEastChunk);
+        chunkList.add(southWestChunk);
+        chunkList.add(northEastChunk);
+        chunkList.add(northWestChunk);
+        return chunkList;
+    }
+    
+    @Inject(method = "c(III)V", at = @At("HEAD"), cancellable = true)
+    private void onRelightBlock(int x, int y, int z, CallbackInfo ci) {
+        lightExecutorService.execute(() -> {
+            this.relightBlockAsync(x, y, z);
+        });
+        ci.cancel();
+    }
+    
+    /**
+     * Relight's a block async.
+     * 
+     * @param x The x position
+     * @param y The y position
+     * @param z The z position
+     */
+    private void relightBlockAsync(int x, int y, int z) {
+        int i = this.heightMap[z << 4 | x] & 255;
+        int j = i;
+        
+        if (y > i) {
+            j = y;
+        }
+        
+        while (j > 0 && this.getBlockData(x, j - 1, z).c() == 0) { // PAIL: getLightOpacity
+            --j;
+        }
+        
+        if (j != i) {
+            this.markBlocksDirtyVerticalAsync(x + this.locX * 16, z + this.locZ * 16, j, i);
+            this.heightMap[z << 4 | x] = j;
+            int k = this.locX * 16 + x;
+            int l = this.locZ * 16 + z;
+            
+            if (this.world.worldProvider.m()) { // PAIL: hasSkyLight
+                if (j < i) {
+                    for (int j1 = j; j1 < i; ++j1) {
+                        ChunkSection extendedblockstorage2 = this.sections[j1 >> 4];
+                        
+                        if (extendedblockstorage2 != Chunk.EMPTY_CHUNK_SECTION) {
+                            extendedblockstorage2.a(x, j1 & 15, z, 15); // PAIL: setSkyLight
+                            // this.world.m(new BlockPosition((this.locX << 4) + x, j1, (this.locZ << 4) + z)); // PAIL: notifyLightSet - client side
+                        }
+                    }
+                } else {
+                    for (int i1 = i; i1 < j; ++i1) {
+                        ChunkSection extendedblockstorage = this.sections[i1 >> 4];
+                        
+                        if (extendedblockstorage != Chunk.EMPTY_CHUNK_SECTION) {
+                            extendedblockstorage.a(x, i1 & 15, z, 0); // PAIL: setSkyLight
+                            // this.world.m(new BlockPosition((this.locX << 4) + x, i1, (this.locZ << 4) + z)); // PAIL: notifyLightSet - client side
+                        }
+                    }
+                }
+                
+                int k1 = 15;
+                
+                while (j > 0 && k1 > 0) {
+                    --j;
+                    int i2 = this.getBlockData(x, j, z).c();
+                    
+                    if (i2 == 0) {
+                        i2 = 1;
+                    }
+                    
+                    k1 -= i2;
+                    
+                    if (k1 < 0) {
+                        k1 = 0;
+                    }
+                    
+                    ChunkSection extendedblockstorage1 = this.sections[j >> 4];
+                    
+                    if (extendedblockstorage1 != Chunk.EMPTY_CHUNK_SECTION) {
+                        extendedblockstorage1.a(x, j & 15, z, k1); // PAIL: setSkyLight
+                    }
+                }
+            }
+            
+            int l1 = this.heightMap[z << 4 | x];
+            int j2 = i;
+            int k2 = l1;
+            
+            if (l1 < i) {
+                j2 = l1;
+                k2 = i;
+            }
+            
+            if (l1 < this.heightMapMinimum) {
+                this.heightMapMinimum = l1;
+            }
+            
+            if (this.world.worldProvider.m()) { // PAIL: hasSkyLight
+                for (EnumDirection enumfacing : EnumDirection.EnumDirectionLimit.HORIZONTAL) {
+                    this.updateSkylightNeighborHeight(k + enumfacing.getAdjacentX(), l + enumfacing.getAdjacentZ(), j2, k2); // PAIL: updateSkylightNeighborHeight
+                }
+                
+                this.updateSkylightNeighborHeight(k, l, j2, k2);
+            }
+            
+            this.markDirty();
+        }
+    }
+    
+    /**
+     * Marks a vertical line of blocks as dirty async.
+     * Instead of calling world directly, we pass chunk safely for async light method.
+     * 
+     * @param x1
+     * @param z1
+     * @param x2
+     * @param z2
+     */
+    private void markBlocksDirtyVerticalAsync(int x1, int z1, int x2, int z2) {
+        if (x2 > z2) {
+            int i = z2;
+            z2 = x2;
+            x2 = i;
+        }
+        
+        if (this.world.worldProvider.m()) { // PAIL: hasSkyLight
+            for (int j = x2; j <= z2; ++j) {
+                final BlockPosition pos = new BlockPosition(x1, j, z1);
+                final Chunk chunk = this.getLightChunk(pos.getX() >> 4, pos.getZ() >> 4, null);
+                if (chunk == null) {
+                    continue;
+                }
+                ((IMixinWorldServer) this.world).updateLightAsync(EnumSkyBlock.SKY, new BlockPosition(x1, j, z1), chunk);
+            }
+        }
+        
+        this.world.b(x1, x2, z1, x1, z2, z1); // PAIL: markBlockRangeForRenderUpdate
+    }
+    
+    /**
+     * Checks world light thread-safe.
+     * 
+     * @param lightType The type of light to check
+     * @param pos The block position
+     * @return True if light update was successful, false if not
+     */
+    private boolean checkWorldLightFor(EnumSkyBlock lightType, BlockPosition pos) {
+        final Chunk chunk = this.getLightChunk(pos.getX() >> 4, pos.getZ() >> 4, null);
+        if (chunk == null) {
+            return false;
+        }
+        
+        return ((IMixinWorldServer) this.world).updateLightAsync(lightType, pos, chunk);
+    }
+    
+    private boolean checkWorldLight(BlockPosition pos) {
+        return this.checkWorldLight(pos, null);
+    }
+    
+    /**
+     * Checks world light async.
+     * 
+     * @param pos The block position
+     * @param neighbors A thread-safe list of surrounding neighbor chunks
+     * @return True if light update was successful, false if not
+     */
+    private boolean checkWorldLight(BlockPosition pos, List<Chunk> neighbors) {
+        boolean flag = false;
+        final Chunk chunk = this.getLightChunk(pos.getX() >> 4, pos.getZ() >> 4, neighbors);
+        if (chunk == null) {
+            return false;
+        }
+        
+        if (this.world.worldProvider.m()) { // PAIL: hasSkyLight
+            flag |= ((IMixinWorldServer) this.world).updateLightAsync(EnumSkyBlock.SKY, pos, chunk);
+        }
+        
+        flag = flag | ((IMixinWorldServer) this.world).updateLightAsync(EnumSkyBlock.BLOCK, pos, chunk);
+        return flag;
+    }
+    
+    /**
+     * Gets the list of block positions currently queued for lighting updates.
+     * 
+     * @param type The light type
+     * @return The list of queued block positions, empty if none
+     */
+    @Override
+    public CopyOnWriteArrayList<Short> getQueuedLightingUpdates(EnumSkyBlock type) {
+        if (type == EnumSkyBlock.SKY) {
+            return this.queuedSkyLightingUpdates;
+        }
+        return this.queuedBlockLightingUpdates;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunkProviderServer.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.lighting;
+
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinChunk;
+import net.minecraft.server.ChunkProviderServer;
+import net.minecraft.server.WorldServer;
+
+@Mixin(value = ChunkProviderServer.class, remap = false, priority = 1001)
+public abstract class MixinChunkProviderServer {
+    @Shadow @Final public WorldServer world;
+
+    @Redirect(method = "unloadChunks", at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/server/Chunk;isUnloading()Z"
+    ))
+    public boolean shouldUnload(IMixinChunk chunk) {
+        if (chunk.getPendingLightUpdates().get() > 0 || this.world.getTime() - chunk.getLightUpdateTime() < 20) {
+            return false;
+        }
+        return true;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/lighting/MixinWorld.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.lighting;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.EnumSkyBlock;
+import net.minecraft.server.IChunkProvider;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.World;
+
+@Mixin(value = World.class, remap = false, priority = 1001)
+public abstract class MixinWorld {
+    @Shadow protected IChunkProvider chunkProvider;
+    @Shadow int[] J; // PAIL: lightUpdateBlockList
+    
+    @Shadow(aliases = "c") public abstract boolean checkLightFor(EnumSkyBlock lightType, BlockPosition pos);
+    @Shadow public abstract MinecraftServer getMinecraftServer();
+    @Shadow public abstract boolean areChunksLoaded(BlockPosition center, int radius, boolean allowEmpty);
+    @Shadow public abstract Chunk getChunkIfLoaded(int x, int z);
+}

sources/src/main/java/io/akarin/server/mixin/lighting/MixinWorldServer.java

@@ -0,0 +1,374 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.lighting;
+
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Mixin;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+import io.akarin.api.internal.Akari;
+import io.akarin.api.internal.mixin.IMixinChunk;
+import io.akarin.api.internal.mixin.IMixinWorldServer;
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.EnumDirection;
+import net.minecraft.server.EnumSkyBlock;
+import net.minecraft.server.IBlockData;
+import net.minecraft.server.MCUtil;
+import net.minecraft.server.MathHelper;
+import net.minecraft.server.WorldServer;
+import net.minecraft.server.BlockPosition.PooledBlockPosition;
+
+@Mixin(value = WorldServer.class, remap = false)
+public abstract class MixinWorldServer extends MixinWorld implements IMixinWorldServer {
+    
+    private static final int NUM_XZ_BITS = 4;
+    private static final int NUM_SHORT_Y_BITS = 8;
+    private static final short XZ_MASK = 0xF;
+    private static final short Y_SHORT_MASK = 0xFF;
+    
+    private final static ThreadFactory SERVICE_FACTORY = new ThreadFactoryBuilder().setNameFormat("Akarin Async Lighting Thread - %1$d").build();
+    private final ExecutorService lightExecutorService = getExecutorService();
+    
+    private ExecutorService getExecutorService() {
+        return Executors.newFixedThreadPool(1, SERVICE_FACTORY);
+    }
+    
+    @Override
+    public boolean checkLightFor(EnumSkyBlock lightType, BlockPosition pos) { // PAIL: checkLightFor
+        return updateLightAsync(lightType, pos, null);
+    }
+    
+    public boolean checkLightAsync(EnumSkyBlock lightType, BlockPosition pos, Chunk currentChunk, List<Chunk> neighbors) {
+        // Sponge - This check is not needed as neighbors are checked in updateLightAsync
+        if (false && !this.areChunksLoaded(pos, 17, false)) {
+            return false;
+        } else {
+            final IMixinChunk spongeChunk = (IMixinChunk) currentChunk;
+            int i = 0;
+            int j = 0;
+            int current = this.getLightForAsync(lightType, pos, currentChunk, neighbors); // Sponge - use thread safe method
+            int rawLight = this.getRawBlockLightAsync(lightType, pos, currentChunk, neighbors); // Sponge - use thread safe method
+            int x = pos.getX();
+            int y = pos.getY();
+            int z = pos.getZ();
+            
+            if (rawLight > current) {
+                this.J[j++] = 133152; // PAIL: lightUpdateBlockList
+            } else if (rawLight < current) {
+                this.J[j++] = 133152 | current << 18; // PAIL: lightUpdateBlockList
+                
+                while (i < j) {
+                    int l1 = this.J[i++]; // PAIL: lightUpdateBlockList
+                    int i2 = (l1 & 63) - 32 + x;
+                    int j2 = (l1 >> 6 & 63) - 32 + y;
+                    int k2 = (l1 >> 12 & 63) - 32 + z;
+                    int l2 = l1 >> 18 & 15;
+                    BlockPosition blockpos = new BlockPosition(i2, j2, k2);
+                    int lightLevel = this.getLightForAsync(lightType, blockpos, currentChunk, neighbors); // Sponge - use thread safe method
+                    
+                    if (lightLevel == l2) {
+                        this.setLightForAsync(lightType, blockpos, 0, currentChunk, neighbors); // Sponge - use thread safe method
+                        
+                        if (l2 > 0) {
+                            int j3 = MathHelper.a(i2 - x); // abs
+                            int k3 = MathHelper.a(j2 - y);
+                            int l3 = MathHelper.a(k2 - z);
+                            
+                            if (j3 + k3 + l3 < 17) {
+                                PooledBlockPosition mutableBlockpos = PooledBlockPosition.aquire();
+                                
+                                for (EnumDirection enumfacing : EnumDirection.values()) {
+                                    int i4 = i2 + enumfacing.getAdjacentX();
+                                    int j4 = j2 + enumfacing.getAdjacentX();
+                                    int k4 = k2 + enumfacing.getAdjacentX();
+                                    mutableBlockpos.setValues(i4, j4, k4);
+                                    // Sponge start - get chunk safely
+                                    final Chunk pooledChunk = this.getLightChunk(mutableBlockpos, currentChunk, neighbors);
+                                    if (pooledChunk == null) {
+                                        continue;
+                                    }
+                                    int opacity = Math.max(1, pooledChunk.getBlockData(mutableBlockpos).c()); // PAIL: getLightOpacity
+                                    lightLevel = this.getLightForAsync(lightType, mutableBlockpos, currentChunk, neighbors);
+                                    // Sponge end
+                                    
+                                    if (lightLevel == l2 - opacity && j < this.J.length) { // PAIL: lightUpdateBlockList
+                                        this.J[j++] = i4 - x + 32 | j4 - y + 32 << 6 | k4 - z + 32 << 12 | l2 - opacity << 18; // PAIL: lightUpdateBlockList
+                                    }
+                                }
+                                
+                                mutableBlockpos.free();
+                            }
+                        }
+                    }
+                }
+                
+                i = 0;
+            }
+            
+            while (i < j) {
+                int i5 = this.J[i++]; // PAIL: lightUpdateBlockList
+                int j5 = (i5 & 63) - 32 + x;
+                int k5 = (i5 >> 6 & 63) - 32 + y;
+                int l5 = (i5 >> 12 & 63) - 32 + z;
+                BlockPosition blockpos1 = new BlockPosition(j5, k5, l5);
+                int i6 = this.getLightForAsync(lightType, blockpos1, currentChunk, neighbors); // Sponge - use thread safe method
+                int j6 = this.getRawBlockLightAsync(lightType, blockpos1, currentChunk, neighbors); // Sponge - use thread safe method
+                
+                if (j6 != i6) {
+                    this.setLightForAsync(lightType, blockpos1, j6, currentChunk, neighbors); // Sponge - use thread safe method
+                    
+                    if (j6 > i6) {
+                        int k6 = Math.abs(j5 - x);
+                        int l6 = Math.abs(k5 - y);
+                        int i7 = Math.abs(l5 - z);
+                        boolean flag = j < this.J.length - 6; // PAIL: lightUpdateBlockList
+                        
+                        if (k6 + l6 + i7 < 17 && flag) {
+                            // Sponge start - use thread safe method getLightForAsync
+                            if (this.getLightForAsync(lightType, blockpos1.west(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 - 1 - x + 32 + (k5 - y + 32 << 6) + (l5 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+
+                            if (this.getLightForAsync(lightType, blockpos1.east(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 + 1 - x + 32 + (k5 - y + 32 << 6) + (l5 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+
+                            if (this.getLightForAsync(lightType, blockpos1.down(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 - x + 32 + (k5 - 1 - y + 32 << 6) + (l5 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+
+                            if (this.getLightForAsync(lightType, blockpos1.up(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 - x + 32 + (k5 + 1 - y + 32 << 6) + (l5 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+
+                            if (this.getLightForAsync(lightType, blockpos1.north(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 - x + 32 + (k5 - y + 32 << 6) + (l5 - 1 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+
+                            if (this.getLightForAsync(lightType, blockpos1.south(), currentChunk, neighbors) < j6) {
+                                this.J[j++] = j5 - x + 32 + (k5 - y + 32 << 6) + (l5 + 1 - z + 32 << 12); // PAIL: lightUpdateBlockList
+                            }
+                            // Sponge end
+                        }
+                    }
+                }
+            }
+            
+            // Sponge start - Asynchronous light updates
+            spongeChunk.getQueuedLightingUpdates(lightType).remove((Short) this.blockPosToShort(pos));
+            spongeChunk.getPendingLightUpdates().decrementAndGet();
+            for (Chunk neighborChunk : neighbors) {
+                final IMixinChunk neighbor = (IMixinChunk) neighborChunk;
+                neighbor.getPendingLightUpdates().decrementAndGet();
+            }
+            // Sponge end
+            return true;
+        }
+    }
+    
+    @Override
+    public boolean updateLightAsync(EnumSkyBlock lightType, BlockPosition pos, @Nullable Chunk currentChunk) {
+        if (this.getMinecraftServer().isStopped() || this.lightExecutorService.isShutdown()) {
+            return false;
+        }
+        
+        if (currentChunk == null) {
+            currentChunk = MCUtil.getLoadedChunkWithoutMarkingActive(chunkProvider, pos.getX() >> 4, pos.getZ() >> 4);
+        }
+        
+        final IMixinChunk spongeChunk = (IMixinChunk) currentChunk;
+        if (currentChunk == null || currentChunk.isUnloading() || !spongeChunk.areNeighborsLoaded()) {
+            return false;
+        }
+        
+        final short shortPos = this.blockPosToShort(pos);
+        if (spongeChunk.getQueuedLightingUpdates(lightType).contains(shortPos)) {
+            return false;
+        }
+        
+        final Chunk chunk = currentChunk;
+        spongeChunk.getQueuedLightingUpdates(lightType).add(shortPos);
+        spongeChunk.getPendingLightUpdates().incrementAndGet();
+        spongeChunk.setLightUpdateTime(chunk.getWorld().getTime());
+        
+        List<Chunk> neighbors = spongeChunk.getNeighbors();
+        // add diagonal chunks
+        Chunk southEastChunk = ((IMixinChunk) spongeChunk.getNeighborChunk(0)).getNeighborChunk(2);
+        Chunk southWestChunk = ((IMixinChunk) spongeChunk.getNeighborChunk(0)).getNeighborChunk(3);
+        Chunk northEastChunk = ((IMixinChunk) spongeChunk.getNeighborChunk(1)).getNeighborChunk(2);
+        Chunk northWestChunk = ((IMixinChunk) spongeChunk.getNeighborChunk(1)).getNeighborChunk(3);
+        if (southEastChunk != null) {
+            neighbors.add(southEastChunk);
+        }
+        if (southWestChunk != null) {
+            neighbors.add(southWestChunk);
+        }
+        if (northEastChunk != null) {
+            neighbors.add(northEastChunk);
+        }
+        if (northWestChunk != null) {
+            neighbors.add(northWestChunk);
+        }
+        
+        for (Chunk neighborChunk : neighbors) {
+            final IMixinChunk neighbor = (IMixinChunk) neighborChunk;
+            neighbor.getPendingLightUpdates().incrementAndGet();
+            neighbor.setLightUpdateTime(chunk.getWorld().getTime());
+        }
+        
+        if (Akari.isPrimaryThread()) { // Akarin
+            this.lightExecutorService.execute(() -> {
+                this.checkLightAsync(lightType, pos, chunk, neighbors);
+            });
+        } else {
+            this.checkLightAsync(lightType, pos, chunk, neighbors);
+        }
+        
+        return true;
+    }
+    
+    @Override
+    public ExecutorService getLightingExecutor() {
+        return this.lightExecutorService;
+    }
+    
+    // Thread safe methods to retrieve a chunk during async light updates
+    // Each method avoids calling getLoadedChunk and instead accesses the passed neighbor chunk list to avoid concurrency issues
+    public Chunk getLightChunk(BlockPosition pos, Chunk currentChunk, List<Chunk> neighbors) {
+        if (currentChunk.a(pos.getX() >> 4, pos.getZ() >> 4)) { // PAIL: isAtLocation
+            if (currentChunk.isUnloading()) {
+                return null;
+            }
+            return currentChunk;
+        }
+        for (Chunk neighbor : neighbors) {
+            if (neighbor.a(pos.getX() >> 4, pos.getZ() >> 4)) { // PAIL: isAtLocation
+                if (neighbor.isUnloading()) {
+                    return null;
+                }
+                return neighbor;
+            }
+        }
+        
+        return null;
+    }
+    
+    private int getLightForAsync(EnumSkyBlock lightType, BlockPosition pos, Chunk currentChunk, List<Chunk> neighbors) {
+        if (pos.getY() < 0) {
+            pos = new BlockPosition(pos.getX(), 0, pos.getZ());
+        }
+        if (!pos.isValidLocation()) {
+            return lightType.c; // PAIL: defaultLightValue
+        }
+        
+        final Chunk chunk = this.getLightChunk(pos, currentChunk, neighbors);
+        if (chunk == null || chunk.isUnloading()) {
+            return lightType.c; // PAIL: defaultLightValue
+        }
+        
+        return chunk.getBrightness(lightType, pos);
+    }
+    
+    private int getRawBlockLightAsync(EnumSkyBlock lightType, BlockPosition pos, Chunk currentChunk, List<Chunk> neighbors) {
+        final Chunk chunk = getLightChunk(pos, currentChunk, neighbors);
+        if (chunk == null || chunk.isUnloading()) {
+            return lightType.c; // PAIL: defaultLightValue
+        }
+        if (lightType == EnumSkyBlock.SKY && chunk.c(pos)) { // PAIL: canSeeSky
+            return 15;
+        } else {
+            IBlockData blockData = chunk.getBlockData(pos);
+            int blockLight = blockData.d(); // getLightValue
+            int rawLight = lightType == EnumSkyBlock.SKY ? 0 : blockLight;
+            int opacity = blockData.c(); // PAIL: getLightOpacity
+            
+            if (opacity >= 15 && blockLight > 0) {
+                opacity = 1;
+            }
+            
+            if (opacity < 1) {
+                opacity = 1;
+            }
+            
+            if (opacity >= 15) {
+                return 0;
+            } else if (rawLight >= 14) {
+                return rawLight;
+            } else {
+                for (EnumDirection facing : EnumDirection.values()) {
+                    BlockPosition blockpos = pos.shift(facing);
+                    int current = this.getLightForAsync(lightType, blockpos, currentChunk, neighbors) - opacity;
+                    
+                    if (current > rawLight) {
+                        rawLight = current;
+                    }
+                    
+                    if (rawLight >= 14) {
+                        return rawLight;
+                    }
+                }
+                
+                return rawLight;
+            }
+        }
+    }
+
+    public void setLightForAsync(EnumSkyBlock type, BlockPosition pos, int lightValue, Chunk currentChunk, List<Chunk> neighbors) {
+        if (pos.isValidLocation()) {
+            final Chunk chunk = this.getLightChunk(pos, currentChunk, neighbors);
+            if (chunk != null && !chunk.isUnloading()) {
+                chunk.a(type, pos, lightValue); // PAIL: setLightFor
+                // this.notifyLightSet(pos); // client side
+            }
+        }
+    }
+    
+    private short blockPosToShort(BlockPosition pos) {
+        short serialized = (short) setNibble(0, pos.getX() & XZ_MASK, 0, NUM_XZ_BITS);
+        serialized = (short) setNibble(serialized, pos.getY() & Y_SHORT_MASK, 1, NUM_SHORT_Y_BITS);
+        serialized = (short) setNibble(serialized, pos.getZ() & XZ_MASK, 3, NUM_XZ_BITS);
+        return serialized;
+    }
+
+    /**
+     * Modifies bits in an integer.
+     *
+     * @param num Integer to modify
+     * @param data Bits of data to add
+     * @param which Index of nibble to start at
+     * @param bitsToReplace The number of bits to replace starting from nibble index
+     * @return The modified integer
+     */
+    private int setNibble(int num, int data, int which, int bitsToReplace) {
+        return (num & ~(bitsToReplace << (which * 4)) | (data << (which * 4)));
+    }
+}

sources/src/main/java/io/akarin/server/mixin/nsc/MixinPlayerConnection.java

@@ -1,14 +0,0 @@
-package io.akarin.server.mixin.nsc;
-
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Overwrite;
-
-import net.minecraft.server.PlayerConnection;
-
-@Mixin(value = PlayerConnection.class, remap = false)
-public class MixinPlayerConnection {
-    @Overwrite
-    private long d() {
-        return System.currentTimeMillis(); // nanoTime() / 1000000L
-    }
-}

sources/src/main/java/io/akarin/server/mixin/nsc/NonblockingServerConnection.java

@@ -7,6 +7,7 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.spigotmc.SpigotConfig;
@@ -17,41 +18,52 @@ import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 import com.google.common.collect.Lists;
 
-import io.akarin.api.LocalAddress;
+import io.akarin.api.internal.LocalAddress;
 import io.akarin.server.core.AkarinGlobalConfig;
-import io.akarin.server.core.ChannelAdapter;
 import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelException;
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.ServerChannel;
 import io.netty.channel.epoll.Epoll;
 import io.netty.channel.epoll.EpollServerSocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.timeout.ReadTimeoutHandler;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
 import net.minecraft.server.ChatComponentText;
+import net.minecraft.server.EnumProtocolDirection;
+import net.minecraft.server.HandshakeListener;
+import net.minecraft.server.LegacyPingHandler;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.NetworkManager;
+import net.minecraft.server.PacketDecoder;
+import net.minecraft.server.PacketEncoder;
 import net.minecraft.server.PacketPlayOutKickDisconnect;
+import net.minecraft.server.PacketPrepender;
+import net.minecraft.server.PacketSplitter;
 import net.minecraft.server.ServerConnection;
 
 @Mixin(value = ServerConnection.class, remap = false)
-public class NonblockingServerConnection {
+public abstract class NonblockingServerConnection {
     private final static Logger logger = LogManager.getLogger("NSC");
     
     /**
      * Contains all endpoints added to this NetworkSystem
      */
-    @Shadow @Mutable @Final private List<ChannelFuture> g;
+    @Shadow(aliases = "g") @Mutable @Final private List<ChannelFuture> endPoints;
     /**
      * A list containing all NetworkManager instances of all endpoints
      */
-    @Shadow @Mutable @Final private List<NetworkManager> h;
+    @Shadow(aliases = "h") @Mutable @Final private List<NetworkManager> networkManagers;
     
     @Overwrite
     private void addPending() {} // just keep compatibility
     
-    @Shadow @Final private MinecraftServer f;
+    @Shadow(aliases = "f") @Final private MinecraftServer server;
     
     /**
      * Adds channels (endpoint) that listens on publicly accessible network ports
@@ -65,7 +77,7 @@ public class NonblockingServerConnection {
         Class<? extends ServerChannel> channelClass;
         EventLoopGroup loopGroup;
         
-        if (Epoll.isAvailable() && this.f.af()) { // PAIL: MinecraftServer::useNativeTransport
+        if (Epoll.isAvailable() && this.server.af()) { // PAIL: MinecraftServer::useNativeTransport
             channelClass = EpollServerSocketChannel.class;
             loopGroup = ServerConnection.b.c();
             logger.info("Using epoll channel type");
@@ -75,8 +87,27 @@ public class NonblockingServerConnection {
             logger.info("Using nio channel type");
         }
         
-        ServerBootstrap bootstrap = new ServerBootstrap().channel(channelClass).childHandler(ChannelAdapter.create(h)).group(loopGroup);
-        synchronized (g) {
+        ServerBootstrap bootstrap = new ServerBootstrap().channel(channelClass).childHandler(new ChannelInitializer<Channel>() {
+            @Override
+            protected void initChannel(Channel channel) throws Exception {
+                try {
+                    channel.config().setOption(ChannelOption.TCP_NODELAY, true);
+                } catch (ChannelException ex) {
+                    ;
+                }
+                channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30))
+                                  .addLast("legacy_query", new LegacyPingHandler(MinecraftServer.getServer().getServerConnection()))
+                                  .addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder(EnumProtocolDirection.SERVERBOUND))
+                                  .addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder(EnumProtocolDirection.CLIENTBOUND));
+                
+                NetworkManager manager = new NetworkManager(EnumProtocolDirection.SERVERBOUND);
+                networkManagers.add(manager);
+                
+                channel.pipeline().addLast("packet_handler", manager);
+                manager.setPacketListener(new HandshakeListener(MinecraftServer.getServer(), manager));
+            }
+        }).group(loopGroup);
+        synchronized (endPoints) {
             data.addAll(Lists.transform(AkarinGlobalConfig.extraAddress, s -> {
                 String[] info = s.split(":");
                 try {
@@ -87,7 +118,7 @@ public class NonblockingServerConnection {
                     return null;
                 }
             }));
-            data.forEach(address -> g.add(bootstrap.localAddress(address.host(), address.port()).bind().syncUninterruptibly())); // supports multi-port bind
+            data.forEach(address -> endPoints.add(bootstrap.localAddress(address.host(), address.port()).bind().syncUninterruptibly())); // supports multi-port bind
         }
     }
     
@@ -98,8 +129,8 @@ public class NonblockingServerConnection {
     public void b() {
         this.d = false;
         try {
-            synchronized (g) { // safe fixes
-                for (ChannelFuture channel : g) channel.channel().close().sync();
+            synchronized (endPoints) { // safe fixes
+                for (ChannelFuture channel : endPoints) channel.channel().close().sync();
             }
         } catch (InterruptedException ex) {
             logger.error("Interrupted whilst closing channel");
@@ -110,13 +141,13 @@ public class NonblockingServerConnection {
         try {
             manager.a(); // PAIL: NetworkManager::processReceivedPackets
         } catch (Exception ex) {
-            logger.warn("Failed to handle packet for {}", new Object[] { manager.getSocketAddress(), ex });
-            final ChatComponentText kick = new ChatComponentText("Internal server error");
+            logger.warn("Failed to handle packet for {}", manager.getSocketAddress(), ex);
+            final ChatComponentText message = new ChatComponentText("Internal server error");
             
-            manager.sendPacket(new PacketPlayOutKickDisconnect(kick), new GenericFutureListener<Future<? super Void>>() {
+            manager.sendPacket(new PacketPlayOutKickDisconnect(message), new GenericFutureListener<Future<? super Void>>() {
                 @Override
                 public void operationComplete(Future<? super Void> future) throws Exception {
-                    manager.close(kick);
+                    manager.close(message);
                 }
             }, new GenericFutureListener[0]);
             manager.stopReading();
@@ -128,13 +159,13 @@ public class NonblockingServerConnection {
      */
     @Overwrite
     public void c() throws InterruptedException {
-        synchronized (h) {
+        synchronized (networkManagers) {
             // Spigot - This prevents players from 'gaming' the server, and strategically relogging to increase their position in the tick order
             if (SpigotConfig.playerShuffle > 0 && MinecraftServer.currentTick % SpigotConfig.playerShuffle == 0) {
-                Collections.shuffle(h);
+                Collections.shuffle(networkManagers);
             }
             
-            Iterator<NetworkManager> it = h.iterator();
+            Iterator<NetworkManager> it = networkManagers.iterator();
             while (it.hasNext()) {
                 NetworkManager manager = it.next();
                 if (manager.h()) continue; // PAIL: NetworkManager::hasNoChannel

sources/src/main/java/io/akarin/server/mixin/nsc/OptimisticNetworkManager.java

@@ -8,7 +8,7 @@ import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 
-import io.akarin.api.CheckedConcurrentLinkedQueue;
+import io.akarin.api.internal.collections.CheckedConcurrentLinkedQueue;
 import io.netty.channel.Channel;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
@@ -18,26 +18,26 @@ import net.minecraft.server.Packet;
 import net.minecraft.server.PacketPlayOutMapChunk;
 
 @Mixin(value = NetworkManager.class, remap = false)
-public class OptimisticNetworkManager {
+public abstract class OptimisticNetworkManager {
     @Shadow public Channel channel;
-    @Shadow @Final private Queue<NetworkManager.QueuedPacket> i;
-    @Shadow @Final private ReentrantReadWriteLock j;
+    @Shadow(aliases = "i") @Final private Queue<NetworkManager.QueuedPacket> packets;
+    @Shadow(aliases = "j") @Final private ReentrantReadWriteLock queueLock;
     
-    @Shadow private Queue<NetworkManager.QueuedPacket> getPacketQueue() { return null; }
-    @Shadow private void dispatchPacket(Packet<?> packet, GenericFutureListener<? extends Future<? super Void>>[] genericFutureListeners) {}
+    @Shadow public abstract Queue<NetworkManager.QueuedPacket> getPacketQueue();
+    @Shadow public abstract void dispatchPacket(Packet<?> packet, GenericFutureListener<? extends Future<? super Void>>[] genericFutureListeners);
     
     private static final QueuedPacket SIGNAL_PACKET = new QueuedPacket(null, null);
     
-    @Overwrite
+    @Overwrite // PAIL: trySendQueue
     private boolean m() {
         if (this.channel != null && this.channel.isOpen()) {
-            if (this.i.isEmpty()) { // return if the packet queue is empty so that the write lock by Anti-Xray doesn't affect the vanilla performance at all
+            if (this.packets.isEmpty()) { // return if the packet queue is empty so that the write lock by Anti-Xray doesn't affect the vanilla performance at all
                 return true;
             }
 
-            this.j.readLock().lock();
+            this.queueLock.readLock().lock();
             try {
-                while (!this.i.isEmpty()) {
+                while (!this.packets.isEmpty()) {
                     NetworkManager.QueuedPacket packet = ((CheckedConcurrentLinkedQueue<QueuedPacket>) getPacketQueue()).poll(item -> {
                         return item.getPacket() instanceof PacketPlayOutMapChunk && !((PacketPlayOutMapChunk) item.getPacket()).isReady();
                     }, SIGNAL_PACKET);
@@ -51,7 +51,7 @@ public class OptimisticNetworkManager {
                     }
                 }
             } finally {
-                this.j.readLock().unlock();
+                this.queueLock.readLock().unlock();
             }
             
         }

sources/src/main/java/io/akarin/server/mixin/optimization/MixinEntityHorseAbstract.java

@@ -42,20 +42,21 @@ import net.minecraft.server.World;
 
 @Mixin(value = EntityHorseAbstract.class, remap = false)
 public abstract class MixinEntityHorseAbstract extends Entity {
-    @Shadow @Final private static DataWatcherObject<Optional<UUID>> bJ;
+    @Shadow(aliases = "bJ") @Final private static DataWatcherObject<Optional<UUID>> OWNER_UNIQUE_ID;
     
     @Nullable private Optional<UUID> cachedOwnerId;
     
+    @Nullable
     @Overwrite
-    @Nullable public UUID getOwnerUUID() {
-        if (cachedOwnerId == null) cachedOwnerId = datawatcher.get(bJ);
+    public UUID getOwnerUUID() {
+        if (cachedOwnerId == null) cachedOwnerId = datawatcher.get(OWNER_UNIQUE_ID);
         return cachedOwnerId.orNull();
     }
     
     @Overwrite
     public void setOwnerUUID(@Nullable UUID uuid) {
         cachedOwnerId = Optional.fromNullable(uuid);
-        datawatcher.set(bJ, cachedOwnerId);
+        datawatcher.set(OWNER_UNIQUE_ID, cachedOwnerId);
     }
     
     /**

sources/src/main/java/io/akarin/server/mixin/optimization/MixinEntityTameableAnimal.java

@@ -46,8 +46,9 @@ public abstract class MixinEntityTameableAnimal extends Entity {
     
     @Nullable private Optional<UUID> cachedOwnerId;
     
+    @Nullable
     @Overwrite
-    @Nullable public UUID getOwnerUUID() {
+    public UUID getOwnerUUID() {
         if (cachedOwnerId == null) cachedOwnerId = datawatcher.get(by);
         return cachedOwnerId.orNull();
     }

sources/src/main/java/io/akarin/server/mixin/optimization/MixinPersistentCollection.java

@@ -0,0 +1,47 @@
+package io.akarin.server.mixin.optimization;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import com.destroystokyo.paper.exception.ServerInternalException;
+
+import net.minecraft.server.IDataManager;
+import net.minecraft.server.MCUtil;
+import net.minecraft.server.NBTCompressedStreamTools;
+import net.minecraft.server.NBTTagCompound;
+import net.minecraft.server.PersistentBase;
+import net.minecraft.server.PersistentCollection;
+
+@Mixin(value = PersistentCollection.class, remap = false)
+public abstract class MixinPersistentCollection {
+    @Shadow(aliases = "b") @Final private IDataManager dataManager;
+    
+    @Overwrite
+    private void a(PersistentBase persistentbase) {
+        if (this.dataManager == null) return;
+        
+        File file = this.dataManager.getDataFile(persistentbase.id);
+        if (file == null) return;
+        
+        NBTTagCompound nbttagcompound = new NBTTagCompound();
+        nbttagcompound.set("data", persistentbase.b(new NBTTagCompound()));
+        
+        // Akarin start
+        MCUtil.scheduleAsyncTask(() -> {
+            try {
+                FileOutputStream fileoutputstream = new FileOutputStream(file);
+                
+                NBTCompressedStreamTools.a(nbttagcompound, fileoutputstream);
+                fileoutputstream.close();
+            } catch (Exception exception) {
+                exception.printStackTrace();
+                ServerInternalException.reportInternalException(exception); // Paper
+            }
+        });
+        // Akarin end
+    }
+}

sources/src/main/java/io/akarin/server/mixin/optimization/MixinTileEntityEnchantTable.java

@@ -5,7 +5,7 @@ import org.spongepowered.asm.mixin.Overwrite;
 import net.minecraft.server.TileEntityEnchantTable;
 
 @Mixin(value = TileEntityEnchantTable.class, remap = false)
-public class MixinTileEntityEnchantTable {
+public abstract class MixinTileEntityEnchantTable {
     @Overwrite
     public void e() {} // No tickable
 }

sources/src/main/java/io/akarin/server/mixin/optimization/PandaRedstoneWire.java

@@ -0,0 +1,509 @@
+package io.akarin.server.mixin.optimization;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.bukkit.event.block.BlockRedstoneEvent;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+
+import io.akarin.api.internal.Akari;
+import net.minecraft.server.BaseBlockPosition;
+import net.minecraft.server.Block;
+import net.minecraft.server.BlockDiodeAbstract;
+import net.minecraft.server.BlockObserver;
+import net.minecraft.server.BlockPiston;
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.BlockRedstoneComparator;
+import net.minecraft.server.BlockRedstoneTorch;
+import net.minecraft.server.BlockRedstoneWire;
+import net.minecraft.server.BlockRepeater;
+import net.minecraft.server.Blocks;
+import net.minecraft.server.EnumDirection;
+import net.minecraft.server.IBlockAccess;
+import net.minecraft.server.IBlockData;
+import net.minecraft.server.Material;
+import net.minecraft.server.World;
+
+@Mixin(value = BlockRedstoneWire.class, remap = false)
+public abstract class PandaRedstoneWire extends Block {
+    
+    protected PandaRedstoneWire(Material material) {
+        super(material);
+    }
+    
+    /** Positions that need to be turned off **/
+    private List<BlockPosition> turnOff = Lists.newArrayList();
+    /** Positions that need to be checked to be turned on **/
+    private List<BlockPosition> turnOn = Lists.newArrayList();
+    /** Positions of wire that was updated already (Ordering determines update order and is therefore required!) **/
+    private final Set<BlockPosition> updatedRedstoneWire = Sets.newLinkedHashSet();
+    
+    /** Ordered arrays of the facings; Needed for the update order.
+     *  I went with a vertical-first order here, but vertical last would work to.
+     *  However it should be avoided to update the vertical axis between the horizontal ones as this would cause unneeded directional behavior. **/
+    private static final EnumDirection[] facingsHorizontal = {EnumDirection.WEST, EnumDirection.EAST, EnumDirection.NORTH, EnumDirection.SOUTH};
+    private static final EnumDirection[] facingsVertical = {EnumDirection.DOWN, EnumDirection.UP};
+    private static final EnumDirection[] facings = ArrayUtils.addAll(facingsVertical, facingsHorizontal);
+    
+    /** Offsets for all surrounding blocks that need to receive updates **/
+    private static final BaseBlockPosition[] surroundingBlocksOffset;
+    static {
+        Set<BaseBlockPosition> set = Sets.newLinkedHashSet();
+        for (EnumDirection facing : facings) {
+            set.add(facing.getDirectionPosition());
+        }
+        for (EnumDirection facing1 : facings) {
+            BaseBlockPosition v1 = facing1.getDirectionPosition();
+            for (EnumDirection facing2 : facings) {
+                BaseBlockPosition v2 = facing2.getDirectionPosition();
+                set.add(new BaseBlockPosition(v1.getX() + v2.getX(), v1.getY() + v2.getY(), v1.getZ() + v2.getZ()));
+            }
+        }
+        set.remove(BaseBlockPosition.ZERO);
+        surroundingBlocksOffset = set.toArray(new BaseBlockPosition[set.size()]);
+    }
+    
+    @Shadow(aliases = "g") private boolean canProvidePower;
+    @Shadow public abstract int getPower(World world, BlockPosition pos, int strength);
+    @Shadow(aliases = "b") public abstract boolean isPowerSourceAt(IBlockAccess worldIn, BlockPosition pos, EnumDirection side);
+    
+    @Inject(method = "e", at = @At("HEAD"), cancellable = true)
+    private void onUpdateSurroundingRedstone(World worldIn, BlockPosition pos, IBlockData state, CallbackInfoReturnable<IBlockData> cir) {
+        this.updateSurroundingRedstone(worldIn, pos);
+        cir.setReturnValue(state);
+    }
+    
+    @Inject(method = "a*", at = @At("HEAD"), cancellable = true)
+    private void onCalculateCurrentChanges(World worldIn, BlockPosition pos1, BlockPosition pos2, IBlockData state, CallbackInfoReturnable<IBlockData> cir) {
+        this.calculateCurrentChanges(worldIn, pos1);
+        cir.setReturnValue(state);
+    }
+    
+    /**
+     * Recalculates all surrounding wires and causes all needed updates
+     * 
+     * @author panda
+     * 
+     * @param world World
+     * @param pos Position that needs updating
+     */
+    private void updateSurroundingRedstone(World world, BlockPosition pos) {
+        // Recalculate the connected wires
+        this.calculateCurrentChanges(world, pos);
+
+        // Set to collect all the updates, to only execute them once. Ordering required.
+        Set<BlockPosition> blocksNeedingUpdate = Sets.newLinkedHashSet();
+        
+        // Add the needed updates
+        for (BlockPosition posi : this.updatedRedstoneWire) {
+            this.addBlocksNeedingUpdate(world, posi, blocksNeedingUpdate);
+        }
+        // Add all other updates to keep known behaviors
+        // They are added in a backwards order because it preserves a commonly used behavior with the update order
+        Iterator<BlockPosition> it = Lists.newLinkedList(this.updatedRedstoneWire).descendingIterator();
+        while (it.hasNext()) {
+            this.addAllSurroundingBlocks(it.next(), blocksNeedingUpdate);
+        }
+        // Remove updates on the wires as they just were updated
+        blocksNeedingUpdate.removeAll(this.updatedRedstoneWire);
+        /*
+         * Avoid unnecessary updates on the just updated wires A huge scale test
+         * showed about 40% more ticks per second It's probably less in normal
+         * usage but likely still worth it
+         */
+        this.updatedRedstoneWire.clear();
+        
+        // Execute updates
+        for (BlockPosition posi : blocksNeedingUpdate) {
+            world.applyPhysics(posi, (BlockRedstoneWire) (Object) this, false);
+        }
+    }
+    
+    /**
+     * Turns on or off all connected wires
+     * 
+     * @param worldIn World
+     * @param position Position of the wire that received the update
+     */
+    private void calculateCurrentChanges(World worldIn, BlockPosition position) {
+        // Turn off all connected wires first if needed
+        if (worldIn.getType(position).getBlock() == (BlockRedstoneWire) (Object) this) {
+            turnOff.add(position);
+        } else {
+            // In case this wire was removed, check the surrounding wires
+            this.checkSurroundingWires(worldIn, position);
+        }
+        
+        while (!turnOff.isEmpty()) {
+            BlockPosition pos = turnOff.remove(0);
+            IBlockData state = worldIn.getType(pos);
+            int oldPower = state.get(BlockRedstoneWire.POWER).intValue();
+            this.canProvidePower = false;
+            int blockPower = worldIn.z(pos); // PAIL: isBlockIndirectlyGettingPowered
+            this.canProvidePower = true;
+            int wirePower = this.getSurroundingWirePower(worldIn, pos);
+            
+            // Lower the strength as it moved a block
+            wirePower--;
+            int newPower = Math.max(blockPower, wirePower);
+            
+            // Akarin start - BlockRedstoneEvent
+            if (oldPower != newPower) {
+                BlockRedstoneEvent event = new BlockRedstoneEvent(worldIn.getWorld().getBlockAt(pos.getX(), pos.getY(), pos.getZ()), oldPower, newPower);
+                worldIn.getServer().getPluginManager().callEvent(event);
+                newPower = event.getNewCurrent();
+            }
+            // Akarin end
+            
+            // Power lowered?
+            if (newPower < oldPower) {
+                // If it's still powered by a direct source (but weaker) mark for turn on
+                if (blockPower > 0 && !this.turnOn.contains(pos)) {
+                    this.turnOn.add(pos);
+                }
+                // Set all the way to off for now, because wires that were powered by this need to update first
+                setWireState(worldIn, pos, state, 0);
+            // Power rose?
+            } else if (newPower > oldPower) {
+                // Set new Power
+                this.setWireState(worldIn, pos, state, newPower);
+            }
+            // Check if surrounding wires need to change based on the current/new state and add them to the lists
+            this.checkSurroundingWires(worldIn, pos);
+        }
+        // Now all needed wires are turned off. Time to turn them on again if there is a power source.
+        while (!this.turnOn.isEmpty()) {
+            BlockPosition pos = this.turnOn.remove(0);
+            IBlockData state = worldIn.getType(pos);
+            int oldPower = state.get(BlockRedstoneWire.POWER).intValue();
+            this.canProvidePower = false;
+            int blockPower = worldIn.z(pos); // PAIL: isBlockIndirectlyGettingPowered
+            this.canProvidePower = true;
+            int wirePower = this.getSurroundingWirePower(worldIn, pos);
+            // Lower the strength as it moved a block
+            wirePower--;
+            int newPower = Math.max(blockPower, wirePower);
+            
+            // Akarin start - BlockRedstoneEvent
+            BlockRedstoneEvent event = new BlockRedstoneEvent(worldIn.getWorld().getBlockAt(pos.getX(), pos.getY(), pos.getZ()), oldPower, newPower);
+            worldIn.getServer().getPluginManager().callEvent(event);
+            newPower = event.getNewCurrent();
+            // Akarin end
+            
+            if (newPower > oldPower) {
+                setWireState(worldIn, pos, state, newPower);
+            } else if (newPower < oldPower) {
+                // Add warning
+            }
+            // Check if surrounding wires need to change based on the current/new state and add them to the lists
+            this.checkSurroundingWires(worldIn, pos);
+        }
+        this.turnOff.clear();
+        this.turnOn.clear();
+    }
+
+    /**
+     * Checks if an wire needs to be marked for update depending on the power next to it
+     * 
+     * @author panda
+     * 
+     * @param worldIn World
+     * @param pos Position of the wire that might need to change
+     * @param otherPower Power of the wire next to it
+     */
+    private void addWireToList(World worldIn, BlockPosition pos, int otherPower) {
+        IBlockData state = worldIn.getType(pos);
+        if (state.getBlock() == (BlockRedstoneWire) (Object) this) {
+            int power = state.get(BlockRedstoneWire.POWER).intValue();
+            // Could get powered stronger by the neighbor?
+            if (power < (otherPower - 1) && !this.turnOn.contains(pos)) {
+                // Mark for turn on check.
+                this.turnOn.add(pos);
+            }
+            // Should have powered the neighbor? Probably was powered by it and is in turn off phase.
+            if (power > otherPower && !this.turnOff.contains(pos)) {
+                // Mark for turn off check.
+                this.turnOff.add(pos);
+            }
+        }
+    }
+
+    /**
+     * Checks if the wires around need to get updated depending on this wires state.
+     * Checks all wires below before the same layer before on top to keep
+     * some more rotational symmetry around the y-axis. 
+     * 
+     * @author panda
+     * 
+     * @param worldIn World
+     * @param pos Position of the wire
+     */
+    private void checkSurroundingWires(World worldIn, BlockPosition pos) {
+        IBlockData state = worldIn.getType(pos);
+        int ownPower = 0;
+        if (state.getBlock() == (BlockRedstoneWire) (Object) this) {
+            ownPower = state.get(BlockRedstoneWire.POWER).intValue();
+        }
+        // Check wires on the same layer first as they appear closer to the wire
+        for (EnumDirection facing : facingsHorizontal) {
+            BlockPosition offsetPos = pos.shift(facing);
+            if (facing.getAxis().isHorizontal()) {
+                this.addWireToList(worldIn, offsetPos, ownPower);
+            }
+        }
+        for (EnumDirection facingVertical : facingsVertical) {
+            BlockPosition offsetPos = pos.shift(facingVertical);
+            boolean solidBlock = worldIn.getType(offsetPos).k(); // PAIL: isBlockNormalCube
+            for (EnumDirection facingHorizontal : facingsHorizontal) {
+                // wire can travel upwards if the block on top doesn't cut the wire (is non-solid)
+                // it can travel down if the block below is solid and the block "diagonal" doesn't cut off the wire (is non-solid) 
+                if ((facingVertical == EnumDirection.UP && !solidBlock) || (facingVertical == EnumDirection.DOWN && solidBlock && !worldIn.getType(offsetPos.shift(facingHorizontal)).k())) { // PAIL: isBlockNormalCube
+                    this.addWireToList(worldIn, offsetPos.shift(facingHorizontal), ownPower);
+                }
+            }
+        }
+    }
+
+    /**
+     * Gets the maximum power of the surrounding wires
+     * 
+     * @author panda
+     * 
+     * @param worldIn World
+     * @param pos Position of the asking wire
+     * @return The maximum power of the wires that could power the wire at pos
+     */
+    private int getSurroundingWirePower(World worldIn, BlockPosition pos) {
+        int wirePower = 0;
+        for (EnumDirection enumfacing : EnumDirection.EnumDirectionLimit.HORIZONTAL) {
+            BlockPosition offsetPos = pos.shift(enumfacing);
+            // Wires on the same layer
+            wirePower = this.getPower(worldIn, offsetPos, wirePower);
+            
+            // Block below the wire need to be solid (Upwards diode of slabs/stairs/glowstone) and no block should cut the wire
+            if(worldIn.getType(offsetPos).l() && !worldIn.getType(pos.up()).l()) { // PAIL: isNormalCube
+                wirePower = this.getPower(worldIn, offsetPos.up(), wirePower);
+                // Only get from power below if no block is cutting the wire
+            } else if (!worldIn.getType(offsetPos).l()) { // PAIL: isNormalCube
+                wirePower = this.getPower(worldIn, offsetPos.down(), wirePower);
+            }
+        }
+        return wirePower;
+    }
+
+    /**
+     * Adds all blocks that need to receive an update from a redstone change in this position.
+     * This means only blocks that actually could change.
+     * 
+     * @author panda
+     * 
+     * @param worldIn World
+     * @param pos Position of the wire
+     * @param set Set to add the update positions too
+     */
+    private void addBlocksNeedingUpdate(World worldIn, BlockPosition pos, Set<BlockPosition> set) {
+        List<EnumDirection> connectedSides = this.getSidesToPower(worldIn, pos);
+        // Add the blocks next to the wire first (closest first order)
+        for (EnumDirection facing : facings) {
+            BlockPosition offsetPos = pos.shift(facing);
+            // canConnectTo() is not the nicest solution here as it returns true for e.g. the front of a repeater
+            // canBlockBePowereFromSide catches these cases
+            if (!connectedSides.contains(facing.opposite()) && facing != EnumDirection.DOWN
+                    && (!facing.getAxis().isHorizontal() || canConnectToBlock(worldIn.getType(offsetPos), facing))) continue;
+            if (this.canBlockBePoweredFromSide(worldIn.getType(offsetPos), facing, true))
+                set.add(offsetPos);
+        }
+        // Later add blocks around the surrounding blocks that get powered
+        for (EnumDirection facing : facings) {
+            BlockPosition offsetPos = pos.shift(facing);
+            if (!connectedSides.contains(facing.opposite()) && facing != EnumDirection.DOWN || !worldIn.getType(offsetPos).l()) continue; // PAIL: isNormalCube
+            for (EnumDirection facing1 : facings) {
+                if (this.canBlockBePoweredFromSide(worldIn.getType(offsetPos.shift(facing1)), facing1, false))
+                    set.add(offsetPos.shift(facing1));
+            }
+        }
+    }
+
+    /**
+     * Checks if a block can get powered from a side.
+     * This behavior would better be implemented per block type as follows:
+     *  - return false as default. (blocks that are not affected by redstone don't need to be updated, it doesn't really hurt if they are either)
+     *  - return true for all blocks that can get powered from all side and change based on it (doors, fence gates, trap doors, note blocks, lamps, dropper, hopper, TNT, rails, possibly more)
+     *  - implement own logic for pistons, repeaters, comparators and redstone torches
+     *  The current implementation was chosen to keep everything in one class.
+     *  
+     *  Why is this extra check needed?
+     *  1. It makes sure that many old behaviors still work (QC + Pistons).
+     *  2. It prevents updates from "jumping".
+     *     Or rather it prevents this wire to update a block that would get powered by the next one of the same line.
+     *     This is to prefer as it makes understanding the update order of the wire really easy. The signal "travels" from the power source.
+     * 
+     * @author panda
+     * 
+     * @param state      State of the block
+     * @param side       Side from which it gets powered
+     * @param isWire     True if it's powered by a wire directly, False if through a block
+     * @return           True if the block can change based on the power level it gets on the given side, false otherwise
+     */
+    private boolean canBlockBePoweredFromSide(IBlockData state, EnumDirection side, boolean isWire) {
+        if (state.getBlock() instanceof BlockPiston && state.get(BlockPiston.FACING) == side.opposite()) {
+            return false;
+        }
+        if (state.getBlock() instanceof BlockDiodeAbstract && state.get(BlockDiodeAbstract.FACING) != side.opposite()) {
+            if (isWire && state.getBlock() instanceof BlockRedstoneComparator
+                    && state.get(BlockRedstoneComparator.FACING).k() != side.getAxis() && side.getAxis().isHorizontal()) {
+                return true;
+            }
+            return false;
+        }
+        if (state.getBlock() instanceof BlockRedstoneTorch) {
+            if (isWire || state.get(BlockRedstoneTorch.FACING) != side) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Creates a list of all horizontal sides that can get powered by a wire.
+     * The list is ordered the same as the facingsHorizontal.
+     * 
+     * @param worldIn World
+     * @param pos Position of the wire
+     * @return List of all facings that can get powered by this wire
+     */
+    private List<EnumDirection> getSidesToPower(World worldIn, BlockPosition pos) {
+        List<EnumDirection> retval = Lists.newArrayList();
+        for (EnumDirection facing : facingsHorizontal) {
+            if (isPowerSourceAt(worldIn, pos, facing))
+                retval.add(facing);
+        }
+        if (retval.isEmpty()) return Lists.newArrayList(facingsHorizontal);
+        boolean northsouth = retval.contains(EnumDirection.NORTH) || retval.contains(EnumDirection.SOUTH);
+        boolean eastwest = retval.contains(EnumDirection.EAST) || retval.contains(EnumDirection.WEST);
+        if (northsouth) {
+            retval.remove(EnumDirection.EAST);
+            retval.remove(EnumDirection.WEST);
+        }
+        if (eastwest) {
+            retval.remove(EnumDirection.NORTH);
+            retval.remove(EnumDirection.SOUTH);
+        }
+        return retval;
+    }
+
+    /**
+     * Adds all surrounding positions to a set.
+     * This is the neighbor blocks, as well as their neighbors 
+     * 
+     * @param pos
+     * @param set
+     */
+    private void addAllSurroundingBlocks(BlockPosition pos, Set<BlockPosition> set) {
+        for (BaseBlockPosition vect : surroundingBlocksOffset) {
+            set.add(pos.a(vect)); // PAIL: add
+        }
+    }
+
+    /**
+     * Sets the block state of a wire with a new power level and marks for updates
+     * 
+     * @author panda
+     * 
+     * @param worldIn World
+     * @param pos Position at which the state needs to be set
+     * @param state Old state
+     * @param power Power it should get set to
+     */
+    private void setWireState(World worldIn, BlockPosition pos, IBlockData state, int power) {
+        state = state.set(BlockRedstoneWire.POWER, Integer.valueOf(power));
+        worldIn.setTypeAndData(pos, state, 2);
+        updatedRedstoneWire.add(pos);
+    }
+    
+    /**
+     * @author panda
+     * @reason Uses local surrounding block offset list for notifications.
+     *
+     * @param world The world
+     * @param pos The position
+     * @param state The block state
+     */
+    @Override
+    @Overwrite
+    public void onPlace(World world, BlockPosition pos, IBlockData state) {
+        this.updateSurroundingRedstone(world, pos);
+        for (BaseBlockPosition vec : surroundingBlocksOffset) {
+            world.applyPhysics(pos.a(vec), this, false); // PAIL: add
+        }
+    }
+    
+    /**
+     * @author panda
+     * @reason Uses local surrounding block offset list for notifications.
+     *
+     * @param world The world
+     * @param pos The position
+     */
+    @Override
+    @Overwrite
+    public void remove(World world, BlockPosition pos, IBlockData state) {
+        super.remove(world, pos, state);
+        this.updateSurroundingRedstone(world, pos);
+        for (BaseBlockPosition vec : surroundingBlocksOffset) {
+            world.applyPhysics(pos.a(vec), this, false); // PAIL: add
+        }
+    }
+
+    /**
+     * @author panda
+     * @reason Changed to use getSidesToPower() to avoid duplicate implementation.
+     *
+     * @param blockState The block state
+     * @param blockAccess The block access
+     * @param pos The position
+     * @param side The side
+     */
+    @Override
+    @Overwrite
+    public int b(IBlockData blockState, IBlockAccess blockAccess, BlockPosition pos, EnumDirection side) { // PAIL: getWeakPower
+        if (!this.canProvidePower) {
+            return 0;
+        } else {
+            if (side == EnumDirection.UP || this.getSidesToPower((World) blockAccess, pos).contains(side)) {
+                return blockState.get(BlockRedstoneWire.POWER).intValue();
+            } else {
+                return 0;
+            }
+        }
+    }
+
+    private static boolean canConnectToBlock(IBlockData blockState, @Nullable EnumDirection side) {
+        Block block = blockState.getBlock();
+        
+        if (block == Blocks.REDSTONE_WIRE) {
+            return true;
+        } else if (Blocks.UNPOWERED_REPEATER.D(blockState)) { // PAIL: isSameDiode
+            EnumDirection enumdirection1 = blockState.get(BlockRepeater.FACING);
+            
+            return enumdirection1 == side || enumdirection1.opposite() == side;
+        } else if (Blocks.dk == blockState.getBlock()) {
+            return side == blockState.get(BlockObserver.FACING); // PAIL: OBSERVER
+        } else {
+            return blockState.m() && side != null; // PAIL: canProvidePower
+        }
+    }
+    
+}

sources/src/main/java/io/akarin/server/mixin/optimization/WeakBigTree.java

@@ -16,11 +16,11 @@ import net.minecraft.server.WorldGenBigTree;
  * Fixes MC-128547(https://bugs.mojang.com/browse/MC-128547)
  */
 @Mixin(value = WorldGenBigTree.class, remap = false)
-public class WeakBigTree {
-    @Shadow private World l;
+public abstract class WeakBigTree {
+    @Shadow(aliases = "l") private World worldReference;
     
     @Inject(method = "generate", at = @At("RETURN"))
     private void clearWorldRef(World world, Random random, BlockPosition pos, CallbackInfoReturnable<?> info) {
-        l = null; // Akarin - remove references to world objects to avoid memory leaks
+        world = null; // Akarin - remove references to world objects to avoid memory leaks
     }
 }

sources/src/main/java/io/akarin/server/mixin/optimization/WeakEnchantmentManager.java

@@ -40,56 +40,56 @@ import net.minecraft.server.ItemStack;
  * Fixes MC-128547(https://bugs.mojang.com/browse/MC-128547)
  */
 @Mixin(value = EnchantmentManager.class, remap = false)
-public class WeakEnchantmentManager {
-    @Shadow @Final private static EnchantmentManager.EnchantmentModifierProtection a;
-    @Shadow @Final private static EnchantmentManager.EnchantmentModifierThorns c;
-    @Shadow @Final private static EnchantmentManager.EnchantmentModifierArthropods d;
+public abstract class WeakEnchantmentManager {
+    @Shadow(aliases = "a") @Final private static EnchantmentManager.EnchantmentModifierProtection protection;
+    @Shadow(aliases = "c") @Final private static EnchantmentManager.EnchantmentModifierThorns thorns;
+    @Shadow(aliases = "d") @Final private static EnchantmentManager.EnchantmentModifierArthropods arthropods;
     
     @Shadow private static void a(EnchantmentManager.EnchantmentModifier modifier, Iterable<ItemStack> iterable) {}
     @Shadow private static void a(EnchantmentManager.EnchantmentModifier modifier, ItemStack itemstack) {}
     
     @Overwrite
     public static int a(Iterable<ItemStack> iterable, DamageSource damageSource) {
-        EnchantmentManager.a.a = 0; // PAIL: damageModifier
-        EnchantmentManager.a.b = damageSource;
-        a(EnchantmentManager.a, iterable);
-        a.b = null; // Akarin - Remove reference to Damagesource
-        return EnchantmentManager.a.a;
+        protection.a = 0; // PAIL: damageModifier
+        protection.b = damageSource;
+        a(protection, iterable); // PAIL: applyEnchantmentModifierArray
+        protection.b = null; // Akarin - Remove reference to Damagesource
+        return protection.a;
     }
     
     @Overwrite
     public static void a(EntityLiving user, Entity attacker) { // PAIL: applyThornEnchantments
-        EnchantmentManager.c.b = attacker;
-        EnchantmentManager.c.a = user;
+        thorns.b = attacker;
+        thorns.a = user;
         if (user != null) {
-            a(EnchantmentManager.c, user.aQ()); // PAIL: applyEnchantmentModifierArray, getEquipmentAndArmor
+            a(thorns, user.aQ()); // PAIL: applyEnchantmentModifierArray - getEquipmentAndArmor
         }
         
         if (attacker instanceof EntityHuman) {
-            a(EnchantmentManager.c, user.getItemInMainHand()); // PAIL: applyEnchantmentModifier
+            a(thorns, user.getItemInMainHand()); // PAIL: applyEnchantmentModifier
         }
         
         // Akarin Start - remove references to entity objects to avoid memory leaks
-        c.b = null;
-        c.a = null;
-        // SAkarin end
+        thorns.b = null;
+        thorns.a = null;
+        // Akarin end
     }
 
     @Overwrite
     public static void b(EntityLiving user, Entity target) { // PAIL: applyArthropodEnchantments
-        EnchantmentManager.d.a = user;
-        EnchantmentManager.d.b = target;
+        arthropods.a = user;
+        arthropods.b = target;
         if (user != null) {
-            a(EnchantmentManager.d, user.aQ()); // PAIL: applyEnchantmentModifierArray, getEquipmentAndArmor
+            a(arthropods, user.aQ()); // PAIL: applyEnchantmentModifierArray - getEquipmentAndArmor
         }
         
         if (user instanceof EntityHuman) {
-            a(EnchantmentManager.d, user.getItemInMainHand()); // PAIL: applyEnchantmentModifier
+            a(arthropods, user.getItemInMainHand()); // PAIL: applyEnchantmentModifier
         }
         
         // Akarin Start - remove references to entity objects to avoid memory leaks
-        d.a = null;
-        d.b = null;
+        arthropods.a = null;
+        arthropods.b = null;
         // Akarin end
     }
 }

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntity.java

@@ -0,0 +1,56 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.Entity;
+import net.minecraft.server.World;
+
+@Mixin(value = Entity.class, remap = false)
+public abstract class MixinEntity {
+    private static final String ENTITY_RIDABLE_COOLDOWN_FIELD = "Lnet/minecraft/entity/Entity;j:I"; // PUTFIELD: rideCooldown
+    private static final String ENTITY_PORTAL_COUNTER_FIELD = "Lnet/minecraft/entity/Entity;al:I"; // PUTFIELD: portalCounter
+    @Shadow protected int j;
+    @Shadow protected int al;
+    @Shadow public World world;
+    
+    // PAIL: onEntityUpdate
+    @Redirect(method = "Y()V", at = @At(value = "FIELD", target = ENTITY_RIDABLE_COOLDOWN_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupEntityCooldown(Entity self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.world).getRealTimeTicks();
+        this.j = Math.max(0, this.j - ticks); // PAIL: rideCooldown
+    }
+    
+    @Redirect(method = "Y()V", at = @At(value = "FIELD", target = ENTITY_PORTAL_COUNTER_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupPortalCounter(Entity self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.world).getRealTimeTicks();
+        this.al += ticks; // PAIL: portalCounter
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityAgeable.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityAgeable;
+
+@Mixin(value = EntityAgeable.class, remap = false)
+public abstract class MixinEntityAgeable {
+    private static final String ENTITY_AGEABLE_SET_GROWING_AGE_METHOD = "Lnet/minecraft/entity/EntityAgeable;setAgeRaw(I)V";
+    
+    // PAIL: onLivingUpdate
+    @Redirect(method = "n()V", at = @At(value = "INVOKE", target = ENTITY_AGEABLE_SET_GROWING_AGE_METHOD, ordinal = 0))
+    public void fixupGrowingUp(EntityAgeable self, int age) {
+        // Subtract the one the original update method added
+        int diff = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks() - 1;
+        self.setAgeRaw(Math.min(0, age + diff));
+    }
+    
+    @Redirect(method = "n()V", at = @At(value = "INVOKE", target = ENTITY_AGEABLE_SET_GROWING_AGE_METHOD, ordinal = 1))
+    public void fixupBreedingCooldown(EntityAgeable self, int age) {
+        // Subtract the one the original update method added
+        int diff = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks() - 1;
+        self.setAgeRaw(Math.max(0, age - diff));
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityExperienceOrb.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityExperienceOrb;
+
+@Mixin(value = EntityExperienceOrb.class, remap = false)
+public abstract class MixinEntityExperienceOrb {
+    private static final String ENTITY_XP_DELAY_PICKUP_FIELD = "Lnet/minecraft/entity/item/EntityExperienceOrb;c:I"; // PUTFIELD: delayBeforeCanPickup
+    private static final String ENTITY_XP_AGE_FIELD = "Lnet/minecraft/entity/item/EntityExperienceOrb;b:I"; // PUTFIELD: xpOrbAge
+    @Shadow public int c; // PAIL: delayBeforeCanPickup
+    @Shadow public int b; // PAIL: xpOrbAge
+    
+    // PAIL: onUpdate
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_XP_DELAY_PICKUP_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupPickupDelay(EntityExperienceOrb self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.c = Math.max(0, this.c - ticks); // PAIL: delayBeforeCanPickup
+    }
+    
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_XP_AGE_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupAge(EntityExperienceOrb self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.b += ticks; // PAIL: xpOrbAge
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityHuman.java

@@ -0,0 +1,61 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityHuman;
+
+@Mixin(value = EntityHuman.class, remap = false)
+public abstract class MixinEntityHuman {
+    private static final String ENTITY_PLAYER_XP_COOLDOWN_FIELD = "Lnet/minecraft/entity/player/EntityHuman;bD:I"; // PUTFIELD: xpCooldown
+    private static final String ENTITY_PLAYER_SLEEP_TIMER_FIELD = "Lnet/minecraft/entity/player/EntityHuman;sleepTicks:I";
+    @Shadow public int bD;
+    @Shadow private int sleepTicks;
+    
+    // PAIL: onUpdate
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_PLAYER_XP_COOLDOWN_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupXpCooldown(EntityHuman self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.bD = Math.max(0, this.bD - ticks); // PAIL: xpCooldown
+    }
+
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_PLAYER_SLEEP_TIMER_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupSleepTimer(EntityHuman self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.sleepTicks += ticks;
+    }
+
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_PLAYER_SLEEP_TIMER_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 2))
+    public void fixupWakeTimer(EntityHuman self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.sleepTicks += ticks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityInsentient.java

@@ -0,0 +1,50 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityInsentient;
+import net.minecraft.server.EntityLiving;
+import net.minecraft.server.World;
+
+@Mixin(value = EntityInsentient.class, remap = false)
+public abstract class MixinEntityInsentient extends EntityLiving {
+    private static final String ENTITY_LIVING_AGE_FIELD = "Lnet/minecraft/entity/EntityInsentient;ticksFarFromPlayer:I";
+
+    public MixinEntityInsentient(World world) {
+        super(world);
+    }
+    
+    @Redirect(method = "doTick", at = @At(value = "FIELD", target = ENTITY_LIVING_AGE_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupEntityDespawnAge(EntityInsentient self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.ticksFarFromPlayer += ticks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityItem.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityItem;
+
+@Mixin(value = EntityItem.class, remap = false)
+public abstract class MixinEntityItem {
+    private static final String ENTITY_ITEM_DELAY_PICKUP_FIELD = "Lnet/minecraft/entity/item/EntityItem;pickupDelay:I";
+    private static final String ENTITY_ITEM_AGE_FIELD = "Lnet/minecraft/entity/item/EntityItem;age:I";
+    @Shadow public int age;
+    @Shadow private int pickupDelay;
+    
+    // PAIL: onUpdate
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_ITEM_DELAY_PICKUP_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupPickupDelay(EntityItem self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.pickupDelay = Math.max(0, this.pickupDelay - ticks);
+    }
+
+    @Redirect(method = "B_()V", at = @At(value = "FIELD", target = ENTITY_ITEM_AGE_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupAge(EntityItem self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.age += ticks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityPlayer.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.Entity;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.World;
+
+@Mixin(value = EntityPlayer.class, remap = false)
+public abstract class MixinEntityPlayer extends Entity {
+    private static final String ENTITY_PLAYER_MP_PORTAL_COOLDOWN_FIELD = "Lnet/minecraft/entity/player/EntityPlayer;portalCooldown:I";
+    
+    public MixinEntityPlayer(World worldIn) {
+        super(worldIn);
+    }
+    
+    // PAIL: decrementTimeUntilPortal
+    @Redirect(method = "I()V", at = @At(value = "FIELD", target = ENTITY_PLAYER_MP_PORTAL_COOLDOWN_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupPortalCooldown(EntityPlayer self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        this.portalCooldown = Math.max(0, this.portalCooldown - ticks);
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinEntityZombieVillager.java

@@ -0,0 +1,47 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.EntityZombieVillager;
+
+@Mixin(value = EntityZombieVillager.class, remap = false)
+public abstract class MixinEntityZombieVillager {
+    private static final String ENTITY_ZOMBIE_GET_CONVERSION_BOOST_METHOD = "Lnet/minecraft/entity/monster/EntityZombieVillager;du()I"; // INVOKE: getConversionProgress
+    
+    @Shadow(aliases = "du") protected abstract int getConversionProgress();
+    
+    // PAIL: onUpdate
+    @Redirect(method = "B_()V", at = @At(value = "INVOKE", target = ENTITY_ZOMBIE_GET_CONVERSION_BOOST_METHOD, ordinal = 0))
+    public int fixupConversionTimeBoost(EntityZombieVillager self) {
+        int ticks = (int) ((IMixinRealTimeTicking) self.getWorld()).getRealTimeTicks();
+        return this.getConversionProgress() * ticks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinMinecraftServer.java

@@ -0,0 +1,30 @@
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.MinecraftServer;
+
+@Mixin(value = MinecraftServer.class, remap = false, priority = 1001)
+public abstract class MixinMinecraftServer implements IMixinRealTimeTicking {
+    private static long lastTickNanos = System.nanoTime();
+    private static long realTimeTicks = 1;
+    
+    @Inject(method = "C()V", at = @At("HEAD")) // PAIL: fullTick
+    public void onTickUpdateRealTimeTicks(CallbackInfo ci) {
+        long currentNanos = System.nanoTime();
+        realTimeTicks = (currentNanos - lastTickNanos) / 50000000;
+        if (realTimeTicks < 1) {
+            realTimeTicks = 1;
+        }
+        lastTickNanos = currentNanos;
+    }
+    
+    @Override
+    public long getRealTimeTicks() {
+        return realTimeTicks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinPlayerConnection.java

@@ -0,0 +1,58 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.PlayerConnection;
+
+@Mixin(value = PlayerConnection.class, remap = false)
+public abstract class MixinPlayerConnection {
+    private static final String NET_HANDLER_PLAY_CHAT_SPAM_FIELD = "Lnet/minecraft/network/PlayerConnection;chatThrottle:I";
+    private static final String NET_HANDLER_PLAY_DROP_SPAM_FIELD = "Lnet/minecraft/network/PlayerConnection;itemDropThreshold:I";
+    @Shadow private volatile int chatThrottle;
+    @Shadow(aliases = "j") private int itemDropThreshold;
+    @Shadow @Final private MinecraftServer minecraftServer;
+    
+    // PAIL: update
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = NET_HANDLER_PLAY_CHAT_SPAM_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupChatSpamCheck(PlayerConnection self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.minecraftServer).getRealTimeTicks();
+        this.chatThrottle = Math.max(0, this.chatThrottle - ticks);
+    }
+    
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = NET_HANDLER_PLAY_DROP_SPAM_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupDropSpamCheck(PlayerConnection self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.minecraftServer).getRealTimeTicks();
+        this.itemDropThreshold = Math.max(0, this.itemDropThreshold - ticks);
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinPlayerInteractManager.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.PlayerInteractManager;
+import net.minecraft.server.World;
+
+@Mixin(value = PlayerInteractManager.class, remap = false)
+public abstract class MixinPlayerInteractManager {
+    private static final String PLAYER_INTERACTION_BLOCK_DAMAGE_FIELD = "Lnet/minecraft/server/management/PlayerInteractManager;currentTick:I";
+    @Shadow public World world;
+    @Shadow private int currentTick;
+    
+    // PAIL: updateBlockRemoving
+    @Redirect(method = "a()V", at = @At(value = "FIELD", target = PLAYER_INTERACTION_BLOCK_DAMAGE_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupDiggingTime(PlayerInteractManager self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.world.getMinecraftServer()).getRealTimeTicks();
+        this.currentTick += ticks;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinTileEntityBrewingStand.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.TileEntity;
+import net.minecraft.server.TileEntityBrewingStand;
+
+@Mixin(value = TileEntityBrewingStand.class, remap = false)
+public abstract class MixinTileEntityBrewingStand extends TileEntity {
+    private static final String BREWING_STAND_BREW_TIME_FIELD = "Lnet/minecraft/tileentity/TileEntityBrewingStand;brewTime:I";
+    @Shadow private int brewTime;
+    
+    // PAIL: update
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = BREWING_STAND_BREW_TIME_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupBrewTime(TileEntityBrewingStand self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.getWorld()).getRealTimeTicks();
+        this.brewTime = Math.max(0, this.brewTime - ticks);
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinTileEntityFurnace.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.spongepowered.asm.lib.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.MathHelper;
+import net.minecraft.server.TileEntity;
+import net.minecraft.server.TileEntityFurnace;
+
+@Mixin(value = TileEntityFurnace.class, remap = false)
+public abstract class MixinTileEntityFurnace extends TileEntity {
+    private static final String FURNACE_BURN_TIME_FIELD = "Lnet/minecraft/tileentity/TileEntityFurnace;burnTime:I";
+    private static final String FURNACE_COOK_TIME_FIELD = "Lnet/minecraft/tileentity/TileEntityFurnace;cookTime:I";
+    @Shadow private int burnTime;
+    @Shadow private int cookTime;
+    @Shadow private int cookTimeTotal;
+    
+    // PAIL: update
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = FURNACE_BURN_TIME_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupBurnTime(TileEntityFurnace self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.getWorld()).getRealTimeTicks();
+        this.burnTime = Math.max(0, this.burnTime - ticks);
+    }
+    
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = FURNACE_COOK_TIME_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 0))
+    public void fixupCookTime(TileEntityFurnace self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.getWorld()).getRealTimeTicks();
+        this.cookTime = Math.min(this.cookTimeTotal, this.cookTime + ticks);
+    }
+    
+    @Redirect(method = "e()V", at = @At(value = "FIELD", target = FURNACE_COOK_TIME_FIELD, opcode = Opcodes.PUTFIELD, ordinal = 3))
+    public void fixupCookTimeCooldown(TileEntityFurnace self, int modifier) {
+        int ticks = (int) ((IMixinRealTimeTicking) this.getWorld()).getRealTimeTicks();
+        this.cookTime = MathHelper.clamp(this.cookTime - (2 * ticks), 0, this.cookTimeTotal);
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorld.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.World;
+
+@Mixin(value = World.class, remap = false, priority = 1002)
+public abstract class MixinWorld implements IMixinRealTimeTicking {
+    @Shadow @Nullable public abstract MinecraftServer getMinecraftServer();
+
+    @Override
+    public long getRealTimeTicks() {
+        if (this.getMinecraftServer() != null) {
+            return ((IMixinRealTimeTicking) this.getMinecraftServer()).getRealTimeTicks();
+        }
+        return 1;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorldServer.java

@@ -0,0 +1,61 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.akarin.server.mixin.realtime;
+
+import org.bukkit.World.Environment;
+import org.bukkit.generator.ChunkGenerator;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import io.akarin.api.internal.mixin.IMixinRealTimeTicking;
+import net.minecraft.server.IDataManager;
+import net.minecraft.server.MethodProfiler;
+import net.minecraft.server.World;
+import net.minecraft.server.WorldData;
+import net.minecraft.server.WorldProvider;
+import net.minecraft.server.WorldServer;
+
+@Mixin(value = WorldServer.class, remap = false, priority = 1001)
+public abstract class MixinWorldServer extends World implements IMixinRealTimeTicking {
+
+    protected MixinWorldServer(IDataManager idatamanager, WorldData worlddata, WorldProvider worldprovider, MethodProfiler methodprofiler, boolean flag, ChunkGenerator gen, Environment env) {
+        super(idatamanager, worlddata, worldprovider, methodprofiler, flag, gen, env);
+    }
+    
+    @Inject(method = "doTick()V", at = @At("HEAD"))
+    public void fixTimeOfDay(CallbackInfo ci) {
+        if (this.getGameRules().getBoolean("doDaylightCycle")) {
+            // Subtract the one the original tick method is going to add
+            long diff = this.getRealTimeTicks() - 1;
+            // Don't set if we're not changing it as other mods might be listening for changes
+            if (diff > 0) {
+                this.worldData.setDayTime(this.worldData.getDayTime() + diff);
+            }
+        }
+    }
+    
+}

sources/src/main/java/net/minecraft/server/EnchantmentManager.java

@@ -18,10 +18,10 @@ import java.util.Map.Entry;
  */
 public class EnchantmentManager {
 
-    public static final EnchantmentManager.EnchantmentModifierProtection a = new EnchantmentManager.EnchantmentModifierProtection(null); // Akarin - private -> public
+    private static final EnchantmentManager.EnchantmentModifierProtection a = new EnchantmentManager.EnchantmentModifierProtection(null);
     private static final EnchantmentManager.EnchantmentModifierDamage b = new EnchantmentManager.EnchantmentModifierDamage(null);
-    public static final EnchantmentManager.EnchantmentModifierThorns c = new EnchantmentManager.EnchantmentModifierThorns(null); // Akarin - private -> public
-    public static final EnchantmentManager.EnchantmentModifierArthropods d = new EnchantmentManager.EnchantmentModifierArthropods(null); // Akarin - private -> public
+    private static final EnchantmentManager.EnchantmentModifierThorns c = new EnchantmentManager.EnchantmentModifierThorns(null);
+    private static final EnchantmentManager.EnchantmentModifierArthropods d = new EnchantmentManager.EnchantmentModifierArthropods(null);
 
     public static int getEnchantmentLevel(Enchantment enchantment, ItemStack itemstack) {
         if (itemstack.isEmpty()) {

sources/src/main/java/net/minecraft/server/EntityPlayer.java

@@ -129,7 +129,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
         if (worldserver.worldProvider.m() && worldserver.getWorldData().getGameType() != EnumGamemode.ADVENTURE) {
             int i = Math.max(0, minecraftserver.a(worldserver));
-            int j = MathHelper.floor(worldserver.getWorldBorder().b(blockposition.getX(), blockposition.getZ()));
+            int j = MathHelper.floor(worldserver.getWorldBorder().b((double) blockposition.getX(), (double) blockposition.getZ()));
 
             if (j < i) {
                 i = j;
@@ -146,7 +146,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
     // CraftBukkit end
 
-    @Override
     public void a(NBTTagCompound nbttagcompound) {
         super.a(nbttagcompound);
         if (this.locY > 300) this.locY = 257; // Paper - bring down to a saner Y level if out of world
@@ -174,7 +173,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     public static void a(DataConverterManager dataconvertermanager) {
         dataconvertermanager.a(DataConverterTypes.PLAYER, new DataInspector() {
-            @Override
             public NBTTagCompound a(DataConverter dataconverter, NBTTagCompound nbttagcompound, int i) {
                 if (nbttagcompound.hasKeyOfType("RootVehicle", 10)) {
                     NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("RootVehicle");
@@ -189,7 +187,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         });
     }
 
-    @Override
     public void b(NBTTagCompound nbttagcompound) {
         super.b(nbttagcompound);
         nbttagcompound.setInt("playerGameType", this.playerInteractManager.getGameMode().getId());
@@ -221,7 +218,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
 
     // CraftBukkit start - World fallback code, either respawn location or global spawn
-    @Override
     public void spawnIn(World world) {
         super.spawnIn(world);
         if (world == null) {
@@ -246,13 +242,11 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
     // CraftBukkit end
 
-    @Override
     public void levelDown(int i) {
         super.levelDown(i);
         this.lastSentExp = -1;
     }
 
-    @Override
     public void enchantDone(ItemStack itemstack, int i) {
         super.enchantDone(itemstack, i);
         this.lastSentExp = -1;
@@ -262,29 +256,24 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.activeContainer.addSlotListener(this);
     }
 
-    @Override
     public void enterCombat() {
         super.enterCombat();
         this.playerConnection.sendPacket(new PacketPlayOutCombatEvent(this.getCombatTracker(), PacketPlayOutCombatEvent.EnumCombatEventType.ENTER_COMBAT));
     }
 
-    @Override
     public void exitCombat() {
         super.exitCombat();
         this.playerConnection.sendPacket(new PacketPlayOutCombatEvent(this.getCombatTracker(), PacketPlayOutCombatEvent.EnumCombatEventType.END_COMBAT));
     }
 
-    @Override
     protected void a(IBlockData iblockdata) {
         CriterionTriggers.d.a(this, iblockdata);
     }
 
-    @Override
     protected ItemCooldown l() {
         return new ItemCooldownPlayer(this);
     }
 
-    @Override
     public void B_() {
         // CraftBukkit start
         if (this.joining) {
@@ -304,7 +293,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
         // Paper end
         if (!this.world.isClientSide && !this.activeContainer.canUse(this)) {
-            this.closeInventory();
+            this.closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.CANT_USE); // Paper
             this.activeContainer = this.defaultContainer;
         }
 
@@ -359,7 +348,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
                 ItemStack itemstack = this.inventory.getItem(i);
 
                 if (!itemstack.isEmpty() && itemstack.getItem().f()) {
-                    Packet packet = ((ItemWorldMapBase) itemstack.getItem()).a(itemstack, this.world, this);
+                    Packet packet = ((ItemWorldMapBase) itemstack.getItem()).a(itemstack, this.world, (EntityHuman) this);
 
                     if (packet != null) {
                         this.playerConnection.sendPacket(packet);
@@ -425,7 +414,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
             }
 
             if (this.oldLevel != this.expLevel) {
-                CraftEventFactory.callPlayerLevelChangeEvent(this.world.getServer().getPlayer(this), this.oldLevel, this.expLevel);
+                CraftEventFactory.callPlayerLevelChangeEvent(this.world.getServer().getPlayer((EntityPlayer) this), this.oldLevel, this.expLevel);
                 this.oldLevel = this.expLevel;
             }
             // CraftBukkit end
@@ -450,7 +439,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void die(DamageSource damagesource) {
         boolean flag = this.world.getGameRules().getBoolean("showDeathMessages");
 
@@ -483,9 +471,9 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
                 if (scoreboardteambase != null && scoreboardteambase.getDeathMessageVisibility() != ScoreboardTeamBase.EnumNameTagVisibility.ALWAYS) {
                     if (scoreboardteambase.getDeathMessageVisibility() == ScoreboardTeamBase.EnumNameTagVisibility.HIDE_FOR_OTHER_TEAMS) {
-                        this.server.getPlayerList().a(this, chatmessage);
+                        this.server.getPlayerList().a((EntityHuman) this, chatmessage);
                     } else if (scoreboardteambase.getDeathMessageVisibility() == ScoreboardTeamBase.EnumNameTagVisibility.HIDE_FOR_OWN_TEAM) {
-                        this.server.getPlayerList().b(this, chatmessage);
+                        this.server.getPlayerList().b((EntityHuman) this, chatmessage);
                     }
                 } else {
                     this.server.getPlayerList().sendMessage(chatmessage);
@@ -501,7 +489,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
             this.inventory.clear();
         }
 
-        this.closeInventory();
+        this.closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.DEATH); // Paper
         this.setSpectatorTarget(this); // Remove spectated target
         // CraftBukkit end
 
@@ -518,7 +506,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         EntityLiving entityliving = this.ci();
 
         if (entityliving != null) {
-            EntityTypes.MonsterEggInfo entitytypes_monsteregginfo = EntityTypes.eggInfo.get(EntityTypes.a(entityliving));
+            EntityTypes.MonsterEggInfo entitytypes_monsteregginfo = (EntityTypes.MonsterEggInfo) EntityTypes.eggInfo.get(EntityTypes.a((Entity) entityliving));
 
             if (entitytypes_monsteregginfo != null) {
                 this.b(entitytypes_monsteregginfo.killedByEntityStatistic);
@@ -534,7 +522,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.getCombatTracker().g();
     }
 
-    @Override
     public void a(Entity entity, int i, DamageSource damagesource) {
         if (entity != this) {
             super.a(entity, i, damagesource);
@@ -603,7 +590,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return Lists.newArrayList();
     }
 
-    @Override
     public boolean damageEntity(DamageSource damagesource, float f) {
         if (this.isInvulnerable(damagesource)) {
             return false;
@@ -634,7 +620,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public boolean a(EntityHuman entityhuman) {
         return !this.canPvP() ? false : super.a(entityhuman);
     }
@@ -644,7 +629,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return this.world.pvpMode;
     }
 
-    @Override
     @Nullable
     public Entity b(int i) {
         if (this.isSleeping()) return this; // CraftBukkit - SPIGOT-3154
@@ -683,7 +667,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public boolean a(EntityPlayer entityplayer) {
         return entityplayer.isSpectator() ? this.getSpecatorTarget() == this : (this.isSpectator() ? false : super.a(entityplayer));
     }
@@ -699,13 +682,11 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void receive(Entity entity, int i) {
         super.receive(entity, i);
         this.activeContainer.b();
     }
 
-    @Override
     public EntityHuman.EnumBedResult a(BlockPosition blockposition) {
         EntityHuman.EnumBedResult entityhuman_enumbedresult = super.a(blockposition);
 
@@ -713,7 +694,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
             this.b(StatisticList.ab);
             PacketPlayOutBed packetplayoutbed = new PacketPlayOutBed(this, blockposition);
 
-            this.x().getTracker().a(this, packetplayoutbed);
+            this.x().getTracker().a((Entity) this, (Packet) packetplayoutbed);
             this.playerConnection.a(this.locX, this.locY, this.locZ, this.yaw, this.pitch);
             this.playerConnection.sendPacket(packetplayoutbed);
             CriterionTriggers.p.a(this);
@@ -722,7 +703,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return entityhuman_enumbedresult;
     }
 
-    @Override
     public void a(boolean flag, boolean flag1, boolean flag2) {
         if (!this.sleeping) return; // CraftBukkit - Can't leave bed if not in one!
         if (this.isSleeping()) {
@@ -736,7 +716,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public boolean a(Entity entity, boolean flag) {
         Entity entity1 = this.bJ();
 
@@ -753,7 +732,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public void stopRiding() {
         Entity entity = this.bJ();
 
@@ -773,15 +751,12 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public boolean isInvulnerable(DamageSource damagesource) {
         return super.isInvulnerable(damagesource) || this.L();
     }
 
-    @Override
     protected void a(double d0, boolean flag, IBlockData iblockdata, BlockPosition blockposition) {}
 
-    @Override
     protected void b(BlockPosition blockposition) {
         if (!this.isSpectator()) {
             super.b(blockposition);
@@ -810,9 +785,8 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         super.a(d0, flag, iblockdata, blockposition);
     }
 
-    @Override
     public void openSign(TileEntitySign tileentitysign) {
-        tileentitysign.a(this);
+        tileentitysign.a((EntityHuman) this);
         this.playerConnection.sendPacket(new PacketPlayOutOpenSignEditor(tileentitysign.getPosition()));
     }
 
@@ -821,7 +795,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return containerCounter; // CraftBukkit
     }
 
-    @Override
     public void openTileEntity(ITileEntityContainer itileentitycontainer) {
         // CraftBukkit start - Inventory open hook
         if (false && itileentitycontainer instanceof ILootable && ((ILootable) itileentitycontainer).b() != null && this.isSpectator()) {
@@ -841,7 +814,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public void openContainer(IInventory iinventory) {
         // CraftBukkit start - Inventory open hook
         // Copied from below
@@ -871,7 +843,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
             this.a((new ChatMessage("container.spectatorCantOpen", new Object[0])).setChatModifier((new ChatModifier()).setColor(EnumChatFormat.RED)), true);
         } else {
             if (this.activeContainer != this.defaultContainer) {
-                this.closeInventory();
+                this.closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.OPEN_NEW); // Paper
             }
 
             if (iinventory instanceof ITileInventory) {
@@ -901,7 +873,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public void openTrade(IMerchant imerchant) {
         // CraftBukkit start - Inventory open hook
         Container container = CraftEventFactory.callInventoryOpenEvent(this, new ContainerMerchant(this.inventory, imerchant, this.world));
@@ -929,7 +900,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void openHorseInventory(EntityHorseAbstract entityhorseabstract, IInventory iinventory) {
         // CraftBukkit start - Inventory open hook
         Container container = CraftEventFactory.callInventoryOpenEvent(this, new ContainerHorse(this.inventory, iinventory, entityhorseabstract, this));
@@ -939,7 +909,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
         // CraftBukkit end
         if (this.activeContainer != this.defaultContainer) {
-            this.closeInventory();
+            this.closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.OPEN_NEW); // Paper
         }
 
         this.nextContainerCounter();
@@ -949,26 +919,23 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.activeContainer.addSlotListener(this);
     }
 
-    @Override
     public void a(ItemStack itemstack, EnumHand enumhand) {
         Item item = itemstack.getItem();
 
         if (item == Items.WRITTEN_BOOK) {
             PacketDataSerializer packetdataserializer = new PacketDataSerializer(Unpooled.buffer());
 
-            packetdataserializer.a(enumhand);
+            packetdataserializer.a((Enum) enumhand);
             this.playerConnection.sendPacket(new PacketPlayOutCustomPayload("MC|BOpen", packetdataserializer));
         }
 
     }
 
-    @Override
     public void a(TileEntityCommand tileentitycommand) {
         tileentitycommand.c(true);
         this.a((TileEntity) tileentitycommand);
     }
 
-    @Override
     public void a(Container container, int i, ItemStack itemstack) {
         if (!(container.getSlot(i) instanceof SlotResult)) {
             if (container == this.defaultContainer) {
@@ -985,7 +952,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.a(container, container.a());
     }
 
-    @Override
     public void a(Container container, NonNullList<ItemStack> nonnulllist) {
         this.playerConnection.sendPacket(new PacketPlayOutWindowItems(container.windowId, nonnulllist));
         this.playerConnection.sendPacket(new PacketPlayOutSetSlot(-1, -1, this.inventory.getCarried()));
@@ -996,12 +962,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         // CraftBukkit end
     }
 
-    @Override
     public void setContainerData(Container container, int i, int j) {
         this.playerConnection.sendPacket(new PacketPlayOutWindowData(container.windowId, i, j));
     }
 
-    @Override
     public void setContainerData(Container container, IInventory iinventory) {
         for (int i = 0; i < iinventory.h(); ++i) {
             this.playerConnection.sendPacket(new PacketPlayOutWindowData(container.windowId, i, iinventory.getProperty(i)));
@@ -1009,9 +973,13 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void closeInventory() {
-        CraftEventFactory.handleInventoryCloseEvent(this); // CraftBukkit
+        // Paper start
+        closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.UNKNOWN);
+    }
+    public void closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason reason) {
+        CraftEventFactory.handleInventoryCloseEvent(this, reason); // CraftBukkit
+        // Paper end
         this.playerConnection.sendPacket(new PacketPlayOutCloseWindow(this.activeContainer.windowId));
         this.r();
     }
@@ -1023,7 +991,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
 
     public void r() {
-        this.activeContainer.b(this);
+        this.activeContainer.b((EntityHuman) this);
         this.activeContainer = this.defaultContainer;
     }
 
@@ -1043,7 +1011,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void a(Statistic statistic, int i) {
         if (statistic != null) {
             this.bZ.b(this, statistic, i);
@@ -1058,7 +1025,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public void a(Statistic statistic) {
         if (statistic != null) {
             this.bZ.setStatistic(this, statistic, 0);
@@ -1073,12 +1039,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
     }
 
-    @Override
     public void a(List<IRecipe> list) {
         this.cr.a(list, this);
     }
 
-    @Override
     public void a(MinecraftKey[] aminecraftkey) {
         ArrayList arraylist = Lists.newArrayList();
         MinecraftKey[] aminecraftkey1 = aminecraftkey;
@@ -1099,7 +1063,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.a((List<IRecipe>) arraylist); // CraftBukkit - decompile error
     }
 
-    @Override
     public void b(List<IRecipe> list) {
         this.cr.b(list, this);
     }
@@ -1130,12 +1093,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
     // CraftBukkit end
 
-    @Override
     public void a(IChatBaseComponent ichatbasecomponent, boolean flag) {
         this.playerConnection.sendPacket(new PacketPlayOutChat(ichatbasecomponent, flag ? ChatMessageType.GAME_INFO : ChatMessageType.CHAT));
     }
 
-    @Override
     protected void v() {
         if (!this.activeItem.isEmpty() && this.isHandRaised()) {
             this.playerConnection.sendPacket(new PacketPlayOutEntityStatus(this, (byte) 9));
@@ -1182,7 +1143,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.setShoulderEntityRight(entityplayer.getShoulderEntityRight());
     }
 
-    @Override
     protected void a(MobEffect mobeffect) {
         super.a(mobeffect);
         this.playerConnection.sendPacket(new PacketPlayOutEntityEffect(this.getId(), mobeffect));
@@ -1194,14 +1154,12 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         CriterionTriggers.z.a(this);
     }
 
-    @Override
     protected void a(MobEffect mobeffect, boolean flag) {
         super.a(mobeffect, flag);
         this.playerConnection.sendPacket(new PacketPlayOutEntityEffect(this.getId(), mobeffect));
         CriterionTriggers.z.a(this);
     }
 
-    @Override
     protected void b(MobEffect mobeffect) {
         super.b(mobeffect);
         this.playerConnection.sendPacket(new PacketPlayOutRemoveEntityEffect(this.getId(), mobeffect.getMobEffect()));
@@ -1212,22 +1170,18 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         CriterionTriggers.z.a(this);
     }
 
-    @Override
     public void enderTeleportTo(double d0, double d1, double d2) {
         this.playerConnection.a(d0, d1, d2, this.yaw, this.pitch);
     }
 
-    @Override
     public void a(Entity entity) {
         this.x().getTracker().sendPacketToEntity(this, new PacketPlayOutAnimation(entity, 4));
     }
 
-    @Override
     public void b(Entity entity) {
         this.x().getTracker().sendPacketToEntity(this, new PacketPlayOutAnimation(entity, 5));
     }
 
-    @Override
     public void updateAbilities() {
         if (this.playerConnection != null) {
             this.playerConnection.sendPacket(new PacketPlayOutAbilities(this.abilities));
@@ -1239,7 +1193,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return (WorldServer) this.world;
     }
 
-    @Override
     public void a(EnumGamemode enumgamemode) {
         // CraftBukkit start
         if (enumgamemode == this.playerInteractManager.getGameMode()) {
@@ -1254,7 +1207,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         // CraftBukkit end
 
         this.playerInteractManager.setGameMode(enumgamemode);
-        this.playerConnection.sendPacket(new PacketPlayOutGameStateChange(3, enumgamemode.getId()));
+        this.playerConnection.sendPacket(new PacketPlayOutGameStateChange(3, (float) enumgamemode.getId()));
         if (enumgamemode == EnumGamemode.SPECTATOR) {
             this.releaseShoulderEntities();
             this.stopRiding();
@@ -1266,22 +1219,18 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.cE();
     }
 
-    @Override
     public boolean isSpectator() {
         return this.playerInteractManager.getGameMode() == EnumGamemode.SPECTATOR;
     }
 
-    @Override
     public boolean z() {
         return this.playerInteractManager.getGameMode() == EnumGamemode.CREATIVE;
     }
 
-    @Override
     public void sendMessage(IChatBaseComponent ichatbasecomponent) {
         this.playerConnection.sendPacket(new PacketPlayOutChat(ichatbasecomponent));
     }
 
-    @Override
     public boolean a(int i, String s) {
         /* CraftBukkit start
         if ("seed".equals(s) && !this.server.aa()) {
@@ -1354,7 +1303,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.playerConnection.sendPacket(new PacketPlayOutResourcePackSend(s, s1));
     }
 
-    @Override
     public BlockPosition getChunkCoordinates() {
         return new BlockPosition(this.locX, this.locY + 0.5D, this.locZ);
     }
@@ -1384,7 +1332,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.removeQueue.remove(Integer.valueOf(entity.getId()));
     }
 
-    @Override
     protected void G() {
         if (this.isSpectator()) {
             this.bY();
@@ -1397,13 +1344,13 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
 
     public Entity getSpecatorTarget() {
-        return this.co == null ? this : this.co;
+        return (Entity) (this.co == null ? this : this.co);
     }
 
     public void setSpectatorTarget(Entity entity) {
         Entity entity1 = this.getSpecatorTarget();
 
-        this.co = entity == null ? this : entity;
+        this.co = (Entity) (entity == null ? this : entity);
         if (entity1 != this.co) {
             this.playerConnection.sendPacket(new PacketPlayOutCamera(this.co));
             this.playerConnection.a(this.co.locX, this.co.locY, this.co.locZ, this.yaw, this.pitch, TeleportCause.SPECTATE); // CraftBukkit
@@ -1411,7 +1358,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     protected void I() {
         if (this.portalCooldown > 0 && !this.worldChangeInvuln) {
             --this.portalCooldown;
@@ -1419,7 +1365,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     }
 
-    @Override
     public void attack(Entity entity) {
         if (this.playerInteractManager.getGameMode() == EnumGamemode.SPECTATOR) {
             this.setSpectatorTarget(entity);
@@ -1438,7 +1383,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return listName; // CraftBukkit
     }
 
-    @Override
     public void a(EnumHand enumhand) {
         super.a(enumhand);
         this.ds();

sources/src/main/java/net/minecraft/server/EntityTracker.java

@@ -0,0 +1,333 @@
+package net.minecraft.server;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+/**
+ * <b>Akarin Changes Note</b><br>
+ * <br>
+ * 1) Make entries-set concurrent<br>
+ * 2) Add lock for entries-set operations<br>
+ * @author cakoyo
+ */
+public class EntityTracker {
+
+    private static final Logger a = LogManager.getLogger();
+    private final WorldServer world;
+    private final Set<EntityTrackerEntry> c = Sets.newConcurrentHashSet(); // Akarin - make concurrent
+    private final ReentrantReadWriteLock entriesLock = new ReentrantReadWriteLock(); // Akarin - add lock
+    public final IntHashMap<EntityTrackerEntry> trackedEntities = new IntHashMap();
+    private int e;
+
+    public EntityTracker(WorldServer worldserver) {
+        this.world = worldserver;
+        this.e = PlayerChunkMap.getFurthestViewableBlock(worldserver.spigotConfig.viewDistance); // Spigot
+    }
+
+    public static long a(double d0) {
+        return MathHelper.d(d0 * 4096.0D);
+    }
+
+    public void track(Entity entity) {
+        if (entity instanceof EntityPlayer) {
+            this.addEntity(entity, 512, 2);
+            EntityPlayer entityplayer = (EntityPlayer) entity;
+            entriesLock.readLock().lock(); // Akarin
+            Iterator iterator = this.c.iterator();
+
+            while (iterator.hasNext()) {
+                EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+                if (entitytrackerentry.b() != entityplayer) {
+                    entitytrackerentry.updatePlayer(entityplayer);
+                }
+            }
+            entriesLock.readLock().unlock(); // Akarin
+        } else if (entity instanceof EntityFishingHook) {
+            this.addEntity(entity, 64, 5, true);
+        } else if (entity instanceof EntityArrow) {
+            this.addEntity(entity, 64, 20, false);
+        } else if (entity instanceof EntitySmallFireball) {
+            this.addEntity(entity, 64, 10, false);
+        } else if (entity instanceof EntityFireball) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntitySnowball) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityLlamaSpit) {
+            this.addEntity(entity, 64, 10, false);
+        } else if (entity instanceof EntityEnderPearl) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityEnderSignal) {
+            this.addEntity(entity, 64, 4, true);
+        } else if (entity instanceof EntityEgg) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityPotion) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityThrownExpBottle) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityFireworks) {
+            this.addEntity(entity, 64, 10, true);
+        } else if (entity instanceof EntityItem) {
+            this.addEntity(entity, 64, 20, true);
+        } else if (entity instanceof EntityMinecartAbstract) {
+            this.addEntity(entity, 80, 3, true);
+        } else if (entity instanceof EntityBoat) {
+            this.addEntity(entity, 80, 3, true);
+        } else if (entity instanceof EntitySquid) {
+            this.addEntity(entity, 64, 3, true);
+        } else if (entity instanceof EntityWither) {
+            this.addEntity(entity, 80, 3, false);
+        } else if (entity instanceof EntityShulkerBullet) {
+            this.addEntity(entity, 80, 3, true);
+        } else if (entity instanceof EntityBat) {
+            this.addEntity(entity, 80, 3, false);
+        } else if (entity instanceof EntityEnderDragon) {
+            this.addEntity(entity, 160, 3, true);
+        } else if (entity instanceof IAnimal) {
+            this.addEntity(entity, 80, 3, true);
+        } else if (entity instanceof EntityTNTPrimed) {
+            this.addEntity(entity, 160, 10, true);
+        } else if (entity instanceof EntityFallingBlock) {
+            this.addEntity(entity, 160, 20, true);
+        } else if (entity instanceof EntityHanging) {
+            this.addEntity(entity, 160, Integer.MAX_VALUE, false);
+        } else if (entity instanceof EntityArmorStand) {
+            this.addEntity(entity, 160, 3, true);
+        } else if (entity instanceof EntityExperienceOrb) {
+            this.addEntity(entity, 160, 20, true);
+        } else if (entity instanceof EntityAreaEffectCloud) {
+            this.addEntity(entity, 160, 10, true); // CraftBukkit
+        } else if (entity instanceof EntityEnderCrystal) {
+            this.addEntity(entity, 256, Integer.MAX_VALUE, false);
+        } else if (entity instanceof EntityEvokerFangs) {
+            this.addEntity(entity, 160, 2, false);
+        }
+
+    }
+
+    public void addEntity(Entity entity, int i, int j) {
+        this.addEntity(entity, i, j, false);
+    }
+
+    public void addEntity(Entity entity, int i, final int j, boolean flag) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity track"); // Spigot
+        i = org.spigotmc.TrackingRange.getEntityTrackingRange(entity, i); // Spigot
+        try {
+            if (this.trackedEntities.b(entity.getId())) {
+                throw new IllegalStateException("Entity is already tracked!");
+            }
+
+            EntityTrackerEntry entitytrackerentry = new EntityTrackerEntry(entity, i, this.e, j, flag);
+
+            entriesLock.writeLock().lock(); // Akarin
+            this.c.add(entitytrackerentry);
+            entriesLock.writeLock().unlock(); // Akarin
+            
+            this.trackedEntities.a(entity.getId(), entitytrackerentry);
+            entitytrackerentry.scanPlayers(this.world.players);
+        } catch (Throwable throwable) {
+            CrashReport crashreport = CrashReport.a(throwable, "Adding entity to track");
+            CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Entity To Track");
+
+            crashreportsystemdetails.a("Tracking range", i + " blocks");
+            final int finalI = i; // CraftBukkit - fix decompile error
+            crashreportsystemdetails.a("Update interval", new CrashReportCallable() {
+                public String a() throws Exception {
+                    String s = "Once per " + finalI + " ticks"; // CraftBukkit
+
+                    if (finalI == Integer.MAX_VALUE) { // CraftBukkit
+                        s = "Maximum (" + s + ")";
+                    }
+
+                    return s;
+                }
+
+                @Override
+                public Object call() throws Exception {
+                    return this.a();
+                }
+            });
+            entity.appendEntityCrashDetails(crashreportsystemdetails);
+            this.trackedEntities.get(entity.getId()).b().appendEntityCrashDetails(crashreport.a("Entity That Is Already Tracked"));
+
+            try {
+                throw new ReportedException(crashreport);
+            } catch (ReportedException reportedexception) {
+                EntityTracker.a.error("\"Silently\" catching entity tracking error.", reportedexception);
+            }
+        }
+
+    }
+
+    public void untrackEntity(Entity entity) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity untrack"); // Spigot
+        entriesLock.writeLock().lock(); // Akarin
+        if (entity instanceof EntityPlayer) {
+            EntityPlayer entityplayer = (EntityPlayer) entity;
+            Iterator iterator = this.c.iterator();
+
+            while (iterator.hasNext()) {
+                EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+                entitytrackerentry.a(entityplayer);
+            }
+        }
+
+        EntityTrackerEntry entitytrackerentry1 = this.trackedEntities.d(entity.getId());
+
+        if (entitytrackerentry1 != null) {
+            this.c.remove(entitytrackerentry1);
+            entitytrackerentry1.a();
+        }
+        entriesLock.writeLock().unlock(); // Akarin
+    }
+
+    public void updatePlayers() {
+        ArrayList arraylist = Lists.newArrayList();
+        entriesLock.readLock().lock(); // Akarin
+        Iterator iterator = this.c.iterator();
+        world.timings.tracker1.startTiming(); // Spigot
+        while (iterator.hasNext()) {
+            EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+            entitytrackerentry.track(this.world.players);
+            if (entitytrackerentry.b) {
+                Entity entity = entitytrackerentry.b();
+
+                if (entity instanceof EntityPlayer) {
+                    arraylist.add(entity);
+                }
+            }
+        }
+        entriesLock.readLock().unlock(); // Akarin
+        world.timings.tracker1.stopTiming(); // Spigot
+
+        world.timings.tracker2.startTiming(); // Spigot
+        for (int i = 0; i < arraylist.size(); ++i) {
+            EntityPlayer entityplayer = (EntityPlayer) arraylist.get(i);
+            Iterator iterator1 = this.c.iterator();
+
+            while (iterator1.hasNext()) {
+                EntityTrackerEntry entitytrackerentry1 = (EntityTrackerEntry) iterator1.next();
+
+                if (entitytrackerentry1.b() != entityplayer) {
+                    entitytrackerentry1.updatePlayer(entityplayer);
+                }
+            }
+        }
+        world.timings.tracker2.stopTiming(); // Spigot
+
+    }
+
+    public void a(EntityPlayer entityplayer) {
+        entriesLock.readLock().lock(); // Akarin
+        Iterator iterator = this.c.iterator();
+
+        while (iterator.hasNext()) {
+            EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+            if (entitytrackerentry.b() == entityplayer) {
+                entitytrackerentry.scanPlayers(this.world.players);
+            } else {
+                entitytrackerentry.updatePlayer(entityplayer);
+            }
+        }
+        entriesLock.readLock().unlock(); // Akarin
+    }
+
+    public void a(Entity entity, Packet<?> packet) {
+        EntityTrackerEntry entitytrackerentry = this.trackedEntities.get(entity.getId());
+
+        if (entitytrackerentry != null) {
+            entitytrackerentry.broadcast(packet);
+        }
+
+    }
+
+    public void sendPacketToEntity(Entity entity, Packet<?> packet) {
+        EntityTrackerEntry entitytrackerentry = this.trackedEntities.get(entity.getId());
+
+        if (entitytrackerentry != null) {
+            entitytrackerentry.broadcastIncludingSelf(packet);
+        }
+
+    }
+
+    public void untrackPlayer(EntityPlayer entityplayer) {
+        entriesLock.readLock().lock(); // Akarin
+        Iterator iterator = this.c.iterator();
+
+        while (iterator.hasNext()) {
+            EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+            entitytrackerentry.clear(entityplayer);
+        }
+        entriesLock.readLock().unlock(); // Akarin
+    }
+
+    public void a(EntityPlayer entityplayer, Chunk chunk) {
+        ArrayList arraylist = Lists.newArrayList();
+        ArrayList arraylist1 = Lists.newArrayList();
+        entriesLock.readLock().lock(); // Akarin
+        Iterator iterator = this.c.iterator();
+
+        while (iterator.hasNext()) {
+            EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+            Entity entity = entitytrackerentry.b();
+
+            if (entity != entityplayer && entity.ab == chunk.locX && entity.ad == chunk.locZ) {
+                entitytrackerentry.updatePlayer(entityplayer);
+                if (entity instanceof EntityInsentient && ((EntityInsentient) entity).getLeashHolder() != null) {
+                    arraylist.add(entity);
+                }
+
+                if (!entity.bF().isEmpty()) {
+                    arraylist1.add(entity);
+                }
+            }
+        }
+        entriesLock.readLock().unlock(); // Akarin
+
+        Entity entity1;
+
+        if (!arraylist.isEmpty()) {
+            iterator = arraylist.iterator();
+
+            while (iterator.hasNext()) {
+                entity1 = (Entity) iterator.next();
+                entityplayer.playerConnection.sendPacket(new PacketPlayOutAttachEntity(entity1, ((EntityInsentient) entity1).getLeashHolder()));
+            }
+        }
+
+        if (!arraylist1.isEmpty()) {
+            iterator = arraylist1.iterator();
+
+            while (iterator.hasNext()) {
+                entity1 = (Entity) iterator.next();
+                entityplayer.playerConnection.sendPacket(new PacketPlayOutMount(entity1));
+            }
+        }
+
+    }
+
+    public void a(int i) {
+        this.e = (i - 1) * 16;
+        entriesLock.readLock().lock(); // Akarin
+        Iterator iterator = this.c.iterator();
+
+        while (iterator.hasNext()) {
+            EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
+
+            entitytrackerentry.a(this.e);
+        }
+        entriesLock.readLock().unlock(); // Akarin
+    }
+}

sources/src/main/java/net/minecraft/server/EnumDirection.java

@@ -0,0 +1,319 @@
+package net.minecraft.server;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterators;
+import com.google.common.collect.Maps;
+import java.util.Iterator;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+import javax.annotation.Nullable;
+
+/**
+ * <b>Akarin Changes Note</b><br>
+ * <br>
+ * 1) Add OBFHELPER<br>
+ * @author cakoyo
+ */
+public enum EnumDirection implements INamable {
+
+    DOWN(0, 1, -1, "down", EnumDirection.EnumAxisDirection.NEGATIVE, EnumDirection.EnumAxis.Y, new BaseBlockPosition(0, -1, 0)), UP(1, 0, -1, "up", EnumDirection.EnumAxisDirection.POSITIVE, EnumDirection.EnumAxis.Y, new BaseBlockPosition(0, 1, 0)), NORTH(2, 3, 2, "north", EnumDirection.EnumAxisDirection.NEGATIVE, EnumDirection.EnumAxis.Z, new BaseBlockPosition(0, 0, -1)), SOUTH(3, 2, 0, "south", EnumDirection.EnumAxisDirection.POSITIVE, EnumDirection.EnumAxis.Z, new BaseBlockPosition(0, 0, 1)), WEST(4, 5, 1, "west", EnumDirection.EnumAxisDirection.NEGATIVE, EnumDirection.EnumAxis.X, new BaseBlockPosition(-1, 0, 0)), EAST(5, 4, 3, "east", EnumDirection.EnumAxisDirection.POSITIVE, EnumDirection.EnumAxis.X, new BaseBlockPosition(1, 0, 0));
+
+    private final int g;
+    private final int h;
+    private final int i;
+    private final String j;
+    private final EnumDirection.EnumAxis k;
+    private final EnumDirection.EnumAxisDirection l;
+    private final BaseBlockPosition m; public BaseBlockPosition getDirectionPosition() { return m; } // Akarin - OBFHELPER
+    private static final EnumDirection[] n = new EnumDirection[6];
+    private static final EnumDirection[] o = new EnumDirection[4];
+    private static final Map<String, EnumDirection> p = Maps.newHashMap();
+
+    private EnumDirection(int i, int j, int k, String s, EnumDirection.EnumAxisDirection enumdirection_enumaxisdirection, EnumDirection.EnumAxis enumdirection_enumaxis, BaseBlockPosition baseblockposition) {
+        this.g = i;
+        this.i = k;
+        this.h = j;
+        this.j = s;
+        this.k = enumdirection_enumaxis;
+        this.l = enumdirection_enumaxisdirection;
+        this.m = baseblockposition;
+    }
+
+    public int a() {
+        return this.g;
+    }
+
+    public int get2DRotationValue() {
+        return this.i;
+    }
+
+    public EnumDirection.EnumAxisDirection c() {
+        return this.l;
+    }
+
+    public EnumDirection opposite() {
+        return fromType1(this.h);
+    }
+
+    public EnumDirection e() {
+        switch (this) {
+        case NORTH:
+            return EnumDirection.EAST;
+
+        case EAST:
+            return EnumDirection.SOUTH;
+
+        case SOUTH:
+            return EnumDirection.WEST;
+
+        case WEST:
+            return EnumDirection.NORTH;
+
+        default:
+            throw new IllegalStateException("Unable to get Y-rotated facing of " + this);
+        }
+    }
+
+    public EnumDirection f() {
+        switch (this) {
+        case NORTH:
+            return EnumDirection.WEST;
+
+        case EAST:
+            return EnumDirection.NORTH;
+
+        case SOUTH:
+            return EnumDirection.EAST;
+
+        case WEST:
+            return EnumDirection.SOUTH;
+
+        default:
+            throw new IllegalStateException("Unable to get CCW facing of " + this);
+        }
+    }
+
+    public int getAdjacentX() {
+        return this.k == EnumDirection.EnumAxis.X ? this.l.a() : 0;
+    }
+
+    public int getAdjacentY() {
+        return this.k == EnumDirection.EnumAxis.Y ? this.l.a() : 0;
+    }
+
+    public int getAdjacentZ() {
+        return this.k == EnumDirection.EnumAxis.Z ? this.l.a() : 0;
+    }
+
+    public String j() {
+        return this.j;
+    }
+
+    public EnumDirection.EnumAxis getAxis() { return k(); } // Akarin - OBFHELPER
+    public EnumDirection.EnumAxis k() {
+        return this.k;
+    }
+
+    public static EnumDirection fromType1(int i) {
+        return EnumDirection.n[MathHelper.a(i % EnumDirection.n.length)];
+    }
+
+    public static EnumDirection fromType2(int i) {
+        return EnumDirection.o[MathHelper.a(i % EnumDirection.o.length)];
+    }
+
+    public static EnumDirection fromAngle(double d0) {
+        return fromType2(MathHelper.floor(d0 / 90.0D + 0.5D) & 3);
+    }
+
+    public float l() {
+        return (this.i & 3) * 90;
+    }
+
+    public static EnumDirection a(Random random) {
+        return values()[random.nextInt(values().length)];
+    }
+
+    @Override
+    public String toString() {
+        return this.j;
+    }
+
+    @Override
+    public String getName() {
+        return this.j;
+    }
+
+    public static EnumDirection a(EnumDirection.EnumAxisDirection enumdirection_enumaxisdirection, EnumDirection.EnumAxis enumdirection_enumaxis) {
+        EnumDirection[] aenumdirection = values();
+        int i = aenumdirection.length;
+
+        for (int j = 0; j < i; ++j) {
+            EnumDirection enumdirection = aenumdirection[j];
+
+            if (enumdirection.c() == enumdirection_enumaxisdirection && enumdirection.k() == enumdirection_enumaxis) {
+                return enumdirection;
+            }
+        }
+
+        throw new IllegalArgumentException("No such direction: " + enumdirection_enumaxisdirection + " " + enumdirection_enumaxis);
+    }
+
+    public static EnumDirection a(BlockPosition blockposition, EntityLiving entityliving) {
+        if (Math.abs(entityliving.locX - (blockposition.getX() + 0.5F)) < 2.0D && Math.abs(entityliving.locZ - (blockposition.getZ() + 0.5F)) < 2.0D) {
+            double d0 = entityliving.locY + entityliving.getHeadHeight();
+
+            if (d0 - blockposition.getY() > 2.0D) {
+                return EnumDirection.UP;
+            }
+
+            if (blockposition.getY() - d0 > 0.0D) {
+                return EnumDirection.DOWN;
+            }
+        }
+
+        return entityliving.getDirection().opposite();
+    }
+
+    static {
+        EnumDirection[] aenumdirection = values();
+        int i = aenumdirection.length;
+
+        for (int j = 0; j < i; ++j) {
+            EnumDirection enumdirection = aenumdirection[j];
+
+            EnumDirection.n[enumdirection.g] = enumdirection;
+            if (enumdirection.k().c()) {
+                EnumDirection.o[enumdirection.i] = enumdirection;
+            }
+
+            EnumDirection.p.put(enumdirection.j().toLowerCase(Locale.ROOT), enumdirection);
+        }
+
+    }
+
+    public static enum EnumDirectionLimit implements Predicate<EnumDirection>, Iterable<EnumDirection> {
+
+        HORIZONTAL, VERTICAL;
+
+        private EnumDirectionLimit() {}
+
+        public EnumDirection[] a() {
+            switch (this) {
+            case HORIZONTAL:
+                return new EnumDirection[] { EnumDirection.NORTH, EnumDirection.EAST, EnumDirection.SOUTH, EnumDirection.WEST};
+
+            case VERTICAL:
+                return new EnumDirection[] { EnumDirection.UP, EnumDirection.DOWN};
+
+            default:
+                throw new Error("Someone\'s been tampering with the universe!");
+            }
+        }
+
+        public EnumDirection a(Random random) {
+            EnumDirection[] aenumdirection = this.a();
+
+            return aenumdirection[random.nextInt(aenumdirection.length)];
+        }
+
+        public boolean a(@Nullable EnumDirection enumdirection) {
+            return enumdirection != null && enumdirection.k().d() == this;
+        }
+
+        @Override
+        public Iterator<EnumDirection> iterator() {
+            return Iterators.forArray(this.a());
+        }
+
+        @Override
+        public boolean apply(@Nullable EnumDirection object) {
+            return this.a(object);
+        }
+    }
+
+    public static enum EnumAxisDirection {
+
+        POSITIVE(1, "Towards positive"), NEGATIVE(-1, "Towards negative");
+
+        private final int c;
+        private final String d;
+
+        private EnumAxisDirection(int i, String s) {
+            this.c = i;
+            this.d = s;
+        }
+
+        public int a() {
+            return this.c;
+        }
+
+        @Override
+        public String toString() {
+            return this.d;
+        }
+    }
+
+    public static enum EnumAxis implements Predicate<EnumDirection>, INamable {
+
+        X("x", EnumDirection.EnumDirectionLimit.HORIZONTAL), Y("y", EnumDirection.EnumDirectionLimit.VERTICAL), Z("z", EnumDirection.EnumDirectionLimit.HORIZONTAL);
+
+        private static final Map<String, EnumDirection.EnumAxis> d = Maps.newHashMap();
+        private final String e;
+        private final EnumDirection.EnumDirectionLimit f;
+
+        private EnumAxis(String s, EnumDirection.EnumDirectionLimit enumdirection_enumdirectionlimit) {
+            this.e = s;
+            this.f = enumdirection_enumdirectionlimit;
+        }
+
+        public String a() {
+            return this.e;
+        }
+
+        public boolean b() {
+            return this.f == EnumDirection.EnumDirectionLimit.VERTICAL;
+        }
+
+        public boolean isHorizontal() { return c(); } // Akarin - OBFHELPER
+        public boolean c() {
+            return this.f == EnumDirection.EnumDirectionLimit.HORIZONTAL;
+        }
+
+        @Override
+        public String toString() {
+            return this.e;
+        }
+
+        public boolean a(@Nullable EnumDirection enumdirection) {
+            return enumdirection != null && enumdirection.k() == this;
+        }
+
+        public EnumDirection.EnumDirectionLimit d() {
+            return this.f;
+        }
+
+        @Override
+        public String getName() {
+            return this.e;
+        }
+
+        @Override
+        public boolean apply(@Nullable EnumDirection object) {
+            return this.a(object);
+        }
+
+        static {
+            EnumDirection.EnumAxis[] aenumdirection_enumaxis = values();
+            int i = aenumdirection_enumaxis.length;
+
+            for (int j = 0; j < i; ++j) {
+                EnumDirection.EnumAxis enumdirection_enumaxis = aenumdirection_enumaxis[j];
+
+                EnumDirection.EnumAxis.d.put(enumdirection_enumaxis.a().toLowerCase(Locale.ROOT), enumdirection_enumaxis);
+            }
+
+        }
+    }
+}

sources/src/main/java/net/minecraft/server/ItemEnderEye.java

@@ -0,0 +1,99 @@
+package net.minecraft.server;
+
+import io.akarin.server.core.AkarinGlobalConfig;
+
+/**
+ * <b>Akarin Changes Note</b><br>
+ * <br>
+ * 1) Add end portal disable feature<br>
+ * @author cakoyo
+ */
+public class ItemEnderEye extends Item {
+
+    public ItemEnderEye() {
+        this.b(CreativeModeTab.f);
+    }
+
+    @Override
+    public EnumInteractionResult a(EntityHuman entityhuman, World world, BlockPosition blockposition, EnumHand enumhand, EnumDirection enumdirection, float f, float f1, float f2) {
+        IBlockData iblockdata = world.getType(blockposition);
+        ItemStack itemstack = entityhuman.b(enumhand);
+
+        if (entityhuman.a(blockposition.shift(enumdirection), enumdirection, itemstack) && iblockdata.getBlock() == Blocks.END_PORTAL_FRAME && !iblockdata.get(BlockEnderPortalFrame.EYE).booleanValue()) {
+            if (world.isClientSide) {
+                return EnumInteractionResult.SUCCESS;
+            } else {
+                world.setTypeAndData(blockposition, iblockdata.set(BlockEnderPortalFrame.EYE, Boolean.valueOf(true)), 2);
+                world.updateAdjacentComparators(blockposition, Blocks.END_PORTAL_FRAME);
+                itemstack.subtract(1);
+
+                for (int i = 0; i < 16; ++i) {
+                    double d0 = blockposition.getX() + (5.0F + ItemEnderEye.j.nextFloat() * 6.0F) / 16.0F;
+                    double d1 = blockposition.getY() + 0.8125F;
+                    double d2 = blockposition.getZ() + (5.0F + ItemEnderEye.j.nextFloat() * 6.0F) / 16.0F;
+                    double d3 = 0.0D;
+                    double d4 = 0.0D;
+                    double d5 = 0.0D;
+
+                    world.addParticle(EnumParticle.SMOKE_NORMAL, d0, d1, d2, 0.0D, 0.0D, 0.0D, new int[0]);
+                }
+
+                world.a((EntityHuman) null, blockposition, SoundEffects.bp, SoundCategory.BLOCKS, 1.0F, 1.0F);
+                if (AkarinGlobalConfig.disableEndPortalCreate) return EnumInteractionResult.SUCCESS; // Akarin
+                ShapeDetector.ShapeDetectorCollection shapedetector_shapedetectorcollection = BlockEnderPortalFrame.e().a(world, blockposition);
+
+                if (shapedetector_shapedetectorcollection != null) {
+                    BlockPosition blockposition1 = shapedetector_shapedetectorcollection.a().a(-3, 0, -3);
+
+                    for (int j = 0; j < 3; ++j) {
+                        for (int k = 0; k < 3; ++k) {
+                            world.setTypeAndData(blockposition1.a(j, 0, k), Blocks.END_PORTAL.getBlockData(), 2);
+                        }
+                    }
+
+                    world.a(1038, blockposition1.a(1, 0, 1), 0);
+                }
+
+                return EnumInteractionResult.SUCCESS;
+            }
+        } else {
+            return EnumInteractionResult.FAIL;
+        }
+    }
+
+    @Override
+    public InteractionResultWrapper<ItemStack> a(World world, EntityHuman entityhuman, EnumHand enumhand) {
+        ItemStack itemstack = entityhuman.b(enumhand);
+        MovingObjectPosition movingobjectposition = this.a(world, entityhuman, false);
+
+        if (movingobjectposition != null && movingobjectposition.type == MovingObjectPosition.EnumMovingObjectType.BLOCK && world.getType(movingobjectposition.a()).getBlock() == Blocks.END_PORTAL_FRAME) {
+            return new InteractionResultWrapper(EnumInteractionResult.PASS, itemstack);
+        } else {
+            entityhuman.c(enumhand);
+            if (!world.isClientSide) {
+                BlockPosition blockposition = ((WorldServer) world).getChunkProviderServer().a(world, "Stronghold", new BlockPosition(entityhuman), false);
+
+                if (blockposition != null) {
+                    EntityEnderSignal entityendersignal = new EntityEnderSignal(world, entityhuman.locX, entityhuman.locY + entityhuman.length / 2.0F, entityhuman.locZ);
+
+                    entityendersignal.a(blockposition);
+                    world.addEntity(entityendersignal);
+                    if (entityhuman instanceof EntityPlayer) {
+                        CriterionTriggers.l.a((EntityPlayer) entityhuman, blockposition);
+                    }
+
+                    world.a((EntityHuman) null, entityhuman.locX, entityhuman.locY, entityhuman.locZ, SoundEffects.bc, SoundCategory.NEUTRAL, 0.5F, 0.4F / (ItemEnderEye.j.nextFloat() * 0.4F + 0.8F));
+                    world.a((EntityHuman) null, 1003, new BlockPosition(entityhuman), 0);
+                    if (!entityhuman.abilities.canInstantlyBuild) {
+                        itemstack.subtract(1);
+                    }
+
+                    entityhuman.b(StatisticList.b(this));
+                    return new InteractionResultWrapper(EnumInteractionResult.SUCCESS, itemstack);
+                }
+            }
+
+            return new InteractionResultWrapper(EnumInteractionResult.SUCCESS, itemstack);
+        }
+    }
+}

sources/src/main/java/net/minecraft/server/NetworkManager.java

@@ -2,7 +2,7 @@ package net.minecraft.server;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
-import io.akarin.api.CheckedConcurrentLinkedQueue;
+import io.akarin.api.internal.collections.CheckedConcurrentLinkedQueue;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;

sources/src/main/java/net/minecraft/server/PaperLightingQueue.java

@@ -0,0 +1,98 @@
+package net.minecraft.server;
+
+import co.aikar.timings.Timing;
+import it.unimi.dsi.fastutil.objects.ObjectCollection;
+
+import java.util.ArrayDeque;
+
+/**
+ * <b>Akarin Changes Note</b><br>
+ * <br>
+ * 1) Expose private members<br>
+ * @author cakoyo
+ */
+class PaperLightingQueue {
+    private static final long MAX_TIME = (long) (1000000000 / 20 * .95);
+    private static int updatesThisTick;
+
+
+    static void processQueue(long curTime) {
+        updatesThisTick = 0;
+
+        final long startTime = System.nanoTime();
+        final long maxTickTime = MAX_TIME - (startTime - curTime);
+
+        START:
+        for (World world : MinecraftServer.getServer().worlds) {
+            if (!world.paperConfig.queueLightUpdates) {
+                continue;
+            }
+
+            ObjectCollection<Chunk> loadedChunks = ((WorldServer) world).getChunkProviderServer().chunks.values();
+            for (Chunk chunk : loadedChunks.toArray(new Chunk[loadedChunks.size()])) {
+                if (chunk.lightingQueue.processQueue(startTime, maxTickTime)) {
+                    break START;
+                }
+            }
+        }
+    }
+
+    public static class LightingQueue extends ArrayDeque<Runnable> { // Akarin - public
+        final private Chunk chunk;
+
+        LightingQueue(Chunk chunk) {
+            super();
+            this.chunk = chunk;
+        }
+
+        /**
+         * Processes the lighting queue for this chunk
+         *
+         * @param startTime If start Time is 0, we will not limit execution time
+         * @param maxTickTime Maximum time to spend processing lighting updates
+         * @return true to abort processing furthur lighting updates
+         */
+        private boolean processQueue(long startTime, long maxTickTime) {
+            if (this.isEmpty()) {
+                return false;
+            }
+            try (Timing ignored = chunk.world.timings.lightingQueueTimer.startTiming()) {
+                Runnable lightUpdate;
+                while ((lightUpdate = this.poll()) != null) {
+                    lightUpdate.run();
+                    if (startTime > 0 && ++PaperLightingQueue.updatesThisTick % 10 == 0 && PaperLightingQueue.updatesThisTick > 10) {
+                        if (System.nanoTime() - startTime > maxTickTime) {
+                            return true;
+                        }
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        /**
+         * Flushes lighting updates to unload the chunk
+         */
+        public void processUnload() { // Akarin - public
+            if (!chunk.world.paperConfig.queueLightUpdates) {
+                return;
+            }
+            processQueue(0, 0); // No timeout
+
+            final int radius = 1; // TODO: bitflip, why should this ever be 2?
+            for (int x = chunk.locX - radius; x <= chunk.locX + radius; ++x) {
+                for (int z = chunk.locZ - radius; z <= chunk.locZ + radius; ++z) {
+                    if (x == chunk.locX && z == chunk.locZ) {
+                        continue;
+                    }
+
+                    Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(chunk.world, x, z);
+                    if (neighbor != null) {
+                        neighbor.lightingQueue.processQueue(0, 0); // No timeout
+                    }
+                }
+            }
+        }
+    }
+}

sources/src/main/java/net/minecraft/server/PlayerChunk.java

@@ -0,0 +1,316 @@
+package net.minecraft.server;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+
+import java.util.Iterator;
+import java.util.List;
+import javax.annotation.Nullable;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+// CraftBukkit Start
+import org.bukkit.craftbukkit.chunkio.ChunkIOExecutor;
+// CraftBukkit end
+
+/**
+ * <b>Akarin Changes Note</b><br>
+ * <br>
+ * 1) Check player list empty<br>
+ * @author cakoyo
+ */
+public class PlayerChunk {
+
+    private static final Logger a = LogManager.getLogger();
+    private final PlayerChunkMap playerChunkMap;
+    public final List<EntityPlayer> c = Lists.newArrayList(); // CraftBukkit - public
+    private final ChunkCoordIntPair location;
+    private final short[] dirtyBlocks = new short[64];
+    @Nullable
+    public Chunk chunk; // CraftBukkit - public
+    private int dirtyCount;
+    private int h;
+    private long i;
+    private boolean done;
+
+    // CraftBukkit start - add fields
+    boolean chunkExists; // Paper
+    private boolean loadInProgress = false;
+    private Runnable loadedRunnable = new Runnable() {
+        @Override
+        public void run() {
+            loadInProgress = false;
+            PlayerChunk.this.chunk = PlayerChunk.this.playerChunkMap.getWorld().getChunkProviderServer().getOrLoadChunkAt(location.x, location.z);
+            markChunkUsed(); // Paper - delay chunk unloads
+        }
+    };
+    // Paper start - delay chunk unloads
+    public final void markChunkUsed() {
+        if (chunk != null && chunk.scheduledForUnload != null) {
+            chunk.scheduledForUnload = null;
+        }
+    }
+    // Paper end
+    // CraftBukkit end
+
+    public PlayerChunk(PlayerChunkMap playerchunkmap, int i, int j) {
+        this.playerChunkMap = playerchunkmap;
+        this.location = new ChunkCoordIntPair(i, j);
+        // CraftBukkit start
+        loadInProgress = true;
+        this.chunk = playerchunkmap.getWorld().getChunkProviderServer().getChunkAt(i, j, loadedRunnable, false);
+        this.chunkExists = this.chunk != null || ChunkIOExecutor.hasQueuedChunkLoad(playerChunkMap.getWorld(), i, j); // Paper
+        markChunkUsed(); // Paper - delay chunk unloads
+        // CraftBukkit end
+    }
+
+    public ChunkCoordIntPair a() {
+        return this.location;
+    }
+
+    public void a(final EntityPlayer entityplayer) { // CraftBukkit - added final to argument
+        if (this.c.contains(entityplayer)) {
+            PlayerChunk.a.debug("Failed to add player. {} already is in chunk {}, {}", entityplayer, Integer.valueOf(this.location.x), Integer.valueOf(this.location.z));
+        } else {
+            if (this.c.isEmpty()) {
+                this.i = this.playerChunkMap.getWorld().getTime();
+            }
+
+            this.c.add(entityplayer);
+            // CraftBukkit start - use async chunk io
+            // if (this.done) {
+            //     this.sendChunk(entityplayer);
+            // }
+            if (this.done) {
+                this.sendChunk(entityplayer);
+            }
+            // CraftBukkit end
+
+        }
+    }
+
+    public void b(EntityPlayer entityplayer) {
+        if (this.c.contains(entityplayer)) {
+            // CraftBukkit start - If we haven't loaded yet don't load the chunk just so we can clean it up
+            if (!this.done) {
+                this.c.remove(entityplayer);
+
+                if (this.c.isEmpty()) {
+                    ChunkIOExecutor.dropQueuedChunkLoad(this.playerChunkMap.getWorld(), this.location.x, this.location.z, this.loadedRunnable);
+                    this.playerChunkMap.b(this);
+                }
+
+                return;
+            }
+            // CraftBukkit end
+            if (this.done) {
+                entityplayer.playerConnection.sendPacket(new PacketPlayOutUnloadChunk(this.location.x, this.location.z));
+            }
+
+            this.c.remove(entityplayer);
+            if (this.c.isEmpty()) {
+                this.playerChunkMap.b(this);
+            }
+
+        }
+    }
+
+    public boolean a(boolean flag) {
+        if (this.chunk != null) {
+            return true;
+        } else {
+            /* CraftBukkit start
+            if (flag) {
+                this.chunk = this.playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(this.location.x, this.location.z);
+            } else {
+                this.chunk = this.playerChunkMap.getWorld().getChunkProviderServer().getOrLoadChunkAt(this.location.x, this.location.z);
+            }
+            */
+            if (!loadInProgress) {
+                loadInProgress = true;
+                this.chunk = playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(this.location.x, this.location.z, loadedRunnable, flag);
+                markChunkUsed(); // Paper - delay chunk unloads
+            }
+            // CraftBukkit end
+
+            return this.chunk != null;
+        }
+    }
+
+    public boolean b() {
+        if (this.done) {
+            return true;
+        } else if (this.chunk == null) {
+            return false;
+        } else if (!this.chunk.isReady()) {
+            return false;
+        } else if (!this.chunk.world.chunkPacketBlockController.onChunkPacketCreate(this.chunk, '\uffff', false)) { // Paper - Anti-Xray - Load nearby chunks if necessary
+            return false; // Paper - Anti-Xray - Wait and try again later
+        } else {
+            this.dirtyCount = 0;
+            this.h = 0;
+            this.done = true;
+            if (c.isEmpty()) return true; // Akarin - Fixes MC-120780
+            PacketPlayOutMapChunk packetplayoutmapchunk = new PacketPlayOutMapChunk(this.chunk, '\uffff');
+            Iterator iterator = this.c.iterator();
+
+            while (iterator.hasNext()) {
+                EntityPlayer entityplayer = (EntityPlayer) iterator.next();
+
+                entityplayer.playerConnection.sendPacket(packetplayoutmapchunk);
+                this.playerChunkMap.getWorld().getTracker().a(entityplayer, this.chunk);
+            }
+
+            return true;
+        }
+    }
+
+    public void sendChunk(EntityPlayer entityplayer) {
+        if (this.done) {
+            this.chunk.world.chunkPacketBlockController.onChunkPacketCreate(this.chunk, '\uffff', true); // Paper - Anti-Xray - Load nearby chunks if necessary
+            entityplayer.playerConnection.sendPacket(new PacketPlayOutMapChunk(this.chunk, '\uffff'));
+            this.playerChunkMap.getWorld().getTracker().a(entityplayer, this.chunk);
+        }
+    }
+
+    public void c() {
+        long i = this.playerChunkMap.getWorld().getTime();
+
+        if (this.chunk != null) {
+            this.chunk.c(this.chunk.x() + i - this.i);
+        }
+
+        this.i = i;
+    }
+
+    public void a(int i, int j, int k) {
+        if (this.done) {
+            if (this.dirtyCount == 0) {
+                this.playerChunkMap.a(this);
+            }
+
+            this.h |= 1 << (j >> 4);
+            if (this.dirtyCount < 64) {
+                short short0 = (short) (i << 12 | k << 8 | j);
+
+                for (int l = 0; l < this.dirtyCount; ++l) {
+                    if (this.dirtyBlocks[l] == short0) {
+                        return;
+                    }
+                }
+
+                this.dirtyBlocks[this.dirtyCount++] = short0;
+            }
+
+        }
+    }
+
+    public void a(Packet<?> packet) {
+        if (this.done) {
+            for (int i = 0; i < this.c.size(); ++i) {
+                this.c.get(i).playerConnection.sendPacket(packet);
+            }
+
+        }
+    }
+
+    public void d() {
+        if (this.done && this.chunk != null) {
+            if (this.dirtyCount != 0) {
+                int i;
+                int j;
+                int k;
+
+                if (this.dirtyCount == 1) {
+                    i = (this.dirtyBlocks[0] >> 12 & 15) + this.location.x * 16;
+                    j = this.dirtyBlocks[0] & 255;
+                    k = (this.dirtyBlocks[0] >> 8 & 15) + this.location.z * 16;
+                    BlockPosition blockposition = new BlockPosition(i, j, k);
+
+                    this.a((new PacketPlayOutBlockChange(this.playerChunkMap.getWorld(), blockposition)));
+                    if (this.playerChunkMap.getWorld().getType(blockposition).getBlock().isTileEntity()) {
+                        this.a(this.playerChunkMap.getWorld().getTileEntity(blockposition));
+                    }
+                } else if (this.dirtyCount == 64) {
+                    // Paper - Anti-Xray - Loading chunks here could cause a ConcurrentModificationException #1104
+                    //this.chunk.world.chunkPacketBlockController.onChunkPacketCreate(this.chunk, this.h, true); // Paper - Anti-Xray - Load nearby chunks if necessary
+                    this.a((new PacketPlayOutMapChunk(this.chunk, this.h)));
+                } else {
+                    this.a((new PacketPlayOutMultiBlockChange(this.dirtyCount, this.dirtyBlocks, this.chunk)));
+
+                    for (i = 0; i < this.dirtyCount; ++i) {
+                        j = (this.dirtyBlocks[i] >> 12 & 15) + this.location.x * 16;
+                        k = this.dirtyBlocks[i] & 255;
+                        int l = (this.dirtyBlocks[i] >> 8 & 15) + this.location.z * 16;
+                        BlockPosition blockposition1 = new BlockPosition(j, k, l);
+
+                        if (this.playerChunkMap.getWorld().getType(blockposition1).getBlock().isTileEntity()) {
+                            this.a(this.playerChunkMap.getWorld().getTileEntity(blockposition1));
+                        }
+                    }
+                }
+
+                this.dirtyCount = 0;
+                this.h = 0;
+            }
+        }
+    }
+
+    private void a(@Nullable TileEntity tileentity) {
+        if (tileentity != null) {
+            PacketPlayOutTileEntityData packetplayouttileentitydata = tileentity.getUpdatePacket();
+
+            if (packetplayouttileentitydata != null) {
+                this.a(packetplayouttileentitydata);
+            }
+        }
+
+    }
+
+    public boolean d(EntityPlayer entityplayer) {
+        return this.c.contains(entityplayer);
+    }
+
+    public boolean a(Predicate<EntityPlayer> predicate) {
+        return Iterables.tryFind(this.c, predicate).isPresent();
+    }
+
+    public boolean a(double d0, Predicate<EntityPlayer> predicate) {
+        int i = 0;
+
+        for (int j = this.c.size(); i < j; ++i) {
+            EntityPlayer entityplayer = this.c.get(i);
+
+            if (predicate.apply(entityplayer) && this.location.a(entityplayer) < d0 * d0) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public boolean e() {
+        return this.done;
+    }
+
+    @Nullable
+    public Chunk f() {
+        return this.chunk;
+    }
+
+    public double g() {
+        double d0 = Double.MAX_VALUE;
+        Iterator iterator = this.c.iterator();
+
+        while (iterator.hasNext()) {
+            EntityPlayer entityplayer = (EntityPlayer) iterator.next();
+            double d1 = this.location.a(entityplayer);
+
+            if (d1 < d0) {
+                d0 = d1;
+            }
+        }
+
+        return d0;
+    }
+}

sources/src/main/java/net/minecraft/server/PlayerConnection.java

@@ -3,6 +3,7 @@ package net.minecraft.server;
 import com.google.common.primitives.Doubles;
 import com.google.common.primitives.Floats;
 
+import io.akarin.api.internal.Akari;
 import io.akarin.server.core.AkarinGlobalConfig;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
@@ -145,7 +146,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     private final static HashSet<Integer> invalidItems = new HashSet<Integer>(java.util.Arrays.asList(8, 9, 10, 11, 26, 34, 36, 43, 51, 55, 59, 62, 63, 64, 68, 71, 74, 75, 83, 90, 92, 93, 94, 104, 105, 115, 117, 118, 119, 125, 127, 132, 140, 141, 142, 144)); // TODO: Check after every update.
     // CraftBukkit end
 
-    @Override
     public void e() {
         this.syncPosition();
         this.player.playerTick();
@@ -188,7 +188,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
 
         this.minecraftServer.methodProfiler.a("keepAlive");
-        /* // Akarin start
+        /* // Akarin
         // Paper Start - give clients a longer time to respond to pings as per pre 1.12.2 timings
         // This should effectively place the keepalive handling back to "as it was" before 1.12.2
         long currentTime = this.getCurrentMillis();
@@ -208,7 +208,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
             }
         }
         // Paper end
-        */ // Akarin end
+        */ // Akarin
 
         this.minecraftServer.methodProfiler.b();
         // CraftBukkit start
@@ -224,7 +224,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
             --this.j;
         }
 
-        if (this.player.J() > 0L && this.minecraftServer.getIdleTimeout() > 0 && MinecraftServer.aw() - this.player.J() > this.minecraftServer.getIdleTimeout() * 1000 * 60) {
+        if (this.player.J() > 0L && this.minecraftServer.getIdleTimeout() > 0 && MinecraftServer.aw() - this.player.J() > (long) (this.minecraftServer.getIdleTimeout() * 1000 * 60)) {
             this.player.resetIdleTimer(); // CraftBukkit - SPIGOT-854
             this.disconnect(new ChatMessage("multiplayer.disconnect.idling", new Object[0]));
         }
@@ -274,7 +274,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         final ChatComponentText chatcomponenttext = new ChatComponentText(s);
 
         this.networkManager.sendPacket(new PacketPlayOutKickDisconnect(chatcomponenttext), new GenericFutureListener() {
-            @Override
             public void operationComplete(Future future) throws Exception { // CraftBukkit - decompile error
                 PlayerConnection.this.networkManager.close(chatcomponenttext);
             }
@@ -283,14 +282,12 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         this.networkManager.stopReading();
         // CraftBukkit - Don't wait
         this.minecraftServer.postToMainThread(new Runnable() {
-            @Override
             public void run() {
                 PlayerConnection.this.networkManager.handleDisconnection();
             }
         });
     }
 
-    @Override
     public void a(PacketPlayInSteerVehicle packetplayinsteervehicle) {
         PlayerConnectionUtils.ensureMainThread(packetplayinsteervehicle, this, this.player.x());
         this.player.a(packetplayinsteervehicle.a(), packetplayinsteervehicle.b(), packetplayinsteervehicle.c(), packetplayinsteervehicle.d());
@@ -304,7 +301,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         return !Doubles.isFinite(packetplayinvehiclemove.getX()) || !Doubles.isFinite(packetplayinvehiclemove.getY()) || !Doubles.isFinite(packetplayinvehiclemove.getZ()) || !Floats.isFinite(packetplayinvehiclemove.getPitch()) || !Floats.isFinite(packetplayinvehiclemove.getYaw());
     }
 
-    @Override
     public void a(PacketPlayInVehicleMove packetplayinvehiclemove) {
         PlayerConnectionUtils.ensureMainThread(packetplayinvehiclemove, this, this.player.x());
         if (b(packetplayinvehiclemove)) {
@@ -354,7 +350,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                 }
                 speed *= 2f; // TODO: Get the speed of the vehicle instead of the player
 
-                if (d10 - d9 > Math.max(100.0D, Math.pow(org.spigotmc.SpigotConfig.movedTooQuicklyMultiplier * i * speed, 2)) && (!this.minecraftServer.R() || !this.minecraftServer.Q().equals(entity.getName()))) { // Spigot
+                if (d10 - d9 > Math.max(100.0D, Math.pow((double) (org.spigotmc.SpigotConfig.movedTooQuicklyMultiplier * (float) i * speed), 2)) && (!this.minecraftServer.R() || !this.minecraftServer.Q().equals(entity.getName()))) { // Spigot
                 // CraftBukkit end
                     PlayerConnection.LOGGER.warn("{} (vehicle of {}) moved too quickly! {},{},{}", entity.getName(), this.player.getName(), Double.valueOf(d6), Double.valueOf(d7), Double.valueOf(d8));
                     this.networkManager.sendPacket(new PacketPlayOutVehicleMove(entity));
@@ -472,7 +468,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
     }
 
-    @Override
     public void a(PacketPlayInTeleportAccept packetplayinteleportaccept) {
         PlayerConnectionUtils.ensureMainThread(packetplayinteleportaccept, this, this.player.x());
         if (packetplayinteleportaccept.a() == this.teleportAwait && this.teleportPos != null) { // CraftBukkit
@@ -489,7 +484,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInRecipeDisplayed packetplayinrecipedisplayed) {
         PlayerConnectionUtils.ensureMainThread(packetplayinrecipedisplayed, this, this.player.x());
         if (packetplayinrecipedisplayed.a() == PacketPlayInRecipeDisplayed.Status.SHOWN) {
@@ -501,7 +495,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInAdvancements packetplayinadvancements) {
         PlayerConnectionUtils.ensureMainThread(packetplayinadvancements, this, this.player.x());
         if (packetplayinadvancements.b() == PacketPlayInAdvancements.Status.OPENED_TAB) {
@@ -515,7 +508,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInFlying packetplayinflying) {
         PlayerConnectionUtils.ensureMainThread(packetplayinflying, this, this.player.x());
         if (b(packetplayinflying)) {
@@ -597,7 +589,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                             if (!this.player.L() && (!this.player.x().getGameRules().getBoolean("disableElytraMovementCheck") || !this.player.cP())) {
                                 float f2 = this.player.cP() ? 300.0F : 100.0F;
 
-                                if (d11 - d10 > Math.max(f2, Math.pow(org.spigotmc.SpigotConfig.movedTooQuicklyMultiplier * i * speed, 2)) && (!this.minecraftServer.R() || !this.minecraftServer.Q().equals(this.player.getName()))) { // Spigot
+                                if (d11 - d10 > Math.max(f2, Math.pow((double) (org.spigotmc.SpigotConfig.movedTooQuicklyMultiplier * (float) i * speed), 2)) && (!this.minecraftServer.R() || !this.minecraftServer.Q().equals(this.player.getName()))) { // Spigot
                                 // CraftBukkit end
                                     PlayerConnection.LOGGER.warn("{} moved too quickly! {},{},{}", this.player.getName(), Double.valueOf(d7), Double.valueOf(d8), Double.valueOf(d9));
                                     this.a(this.player.locX, this.player.locY, this.player.locZ, this.player.yaw, this.player.pitch);
@@ -854,7 +846,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         this.player.playerConnection.sendPacket(new PacketPlayOutPosition(d0, d1, d2, f, f1, set, this.teleportAwait));
     }
 
-    @Override
     public void a(PacketPlayInBlockDig packetplayinblockdig) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockdig, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -917,9 +908,9 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         case START_DESTROY_BLOCK:
         case ABORT_DESTROY_BLOCK:
         case STOP_DESTROY_BLOCK:
-            double d0 = this.player.locX - (blockposition.getX() + 0.5D);
-            double d1 = this.player.locY - (blockposition.getY() + 0.5D) + 1.5D;
-            double d2 = this.player.locZ - (blockposition.getZ() + 0.5D);
+            double d0 = this.player.locX - ((double) blockposition.getX() + 0.5D);
+            double d1 = this.player.locY - ((double) blockposition.getY() + 0.5D) + 1.5D;
+            double d2 = this.player.locZ - ((double) blockposition.getZ() + 0.5D);
             double d3 = d0 * d0 + d1 * d1 + d2 * d2;
 
             if (d3 > 36.0D) {
@@ -983,7 +974,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     }
     // Spigot end
 
-    @Override
     public void a(PacketPlayInUseItem packetplayinuseitem) {
         PlayerConnectionUtils.ensureMainThread(packetplayinuseitem, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -1000,7 +990,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
             chatmessage.getChatModifier().setColor(EnumChatFormat.RED);
             this.player.playerConnection.sendPacket(new PacketPlayOutChat(chatmessage, ChatMessageType.GAME_INFO));
-        } else if (this.teleportPos == null && this.player.d(blockposition.getX() + 0.5D, blockposition.getY() + 0.5D, blockposition.getZ() + 0.5D) < 64.0D && !this.minecraftServer.a(worldserver, blockposition, this.player) && worldserver.getWorldBorder().a(blockposition)) {
+        } else if (this.teleportPos == null && this.player.d((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D) < 64.0D && !this.minecraftServer.a(worldserver, blockposition, this.player) && worldserver.getWorldBorder().a(blockposition)) {
             // CraftBukkit start - Check if we can actually do something over this large a distance
             Location eyeLoc = this.getPlayer().getEyeLocation();
             double reachDistance = NumberConversions.square(eyeLoc.getX() - blockposition.getX()) + NumberConversions.square(eyeLoc.getY() - blockposition.getY()) + NumberConversions.square(eyeLoc.getZ() - blockposition.getZ());
@@ -1015,7 +1005,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         this.player.playerConnection.sendPacket(new PacketPlayOutBlockChange(worldserver, blockposition.shift(enumdirection)));
     }
 
-    @Override
     public void a(PacketPlayInBlockPlace packetplayinblockplace) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockplace, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -1031,7 +1020,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
             float f1 = this.player.pitch;
             float f2 = this.player.yaw;
             double d0 = this.player.locX;
-            double d1 = this.player.locY + this.player.getHeadHeight();
+            double d1 = this.player.locY + (double) this.player.getHeadHeight();
             double d2 = this.player.locZ;
             Vec3D vec3d = new Vec3D(d0, d1, d2);
 
@@ -1042,7 +1031,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
             float f7 = f4 * f5;
             float f8 = f3 * f5;
             double d3 = player.playerInteractManager.getGameMode()== EnumGamemode.CREATIVE ? 5.0D : 4.5D;
-            Vec3D vec3d1 = vec3d.add(f7 * d3, f6 * d3, f8 * d3);
+            Vec3D vec3d1 = vec3d.add((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
             MovingObjectPosition movingobjectposition = this.player.world.rayTrace(vec3d, vec3d1, false);
 
             boolean cancelled;
@@ -1068,7 +1057,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
     }
 
-    @Override
     public void a(PacketPlayInSpectate packetplayinspectate) {
         PlayerConnectionUtils.ensureMainThread(packetplayinspectate, this, this.player.x());
         if (this.player.isSpectator()) {
@@ -1126,7 +1114,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     }
 
     // CraftBukkit start
-    @Override
     public void a(PacketPlayInResourcePackStatus packetplayinresourcepackstatus) {
         PlayerConnectionUtils.ensureMainThread(packetplayinresourcepackstatus, this, this.player.x());
         // Paper start
@@ -1138,7 +1125,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     }
     // CraftBukkit end
 
-    @Override
     public void a(PacketPlayInBoatMove packetplayinboatmove) {
         PlayerConnectionUtils.ensureMainThread(packetplayinboatmove, this, this.player.x());
         Entity entity = this.player.bJ();
@@ -1149,7 +1135,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(IChatBaseComponent ichatbasecomponent) {
         // CraftBukkit start - Rarely it would send a disconnect line twice
         if (this.processedDisconnect) {
@@ -1215,7 +1200,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                     return packet.getClass().getCanonicalName();
                 }
 
-                @Override
                 public Object call() throws Exception {
                     return this.a();
                 }
@@ -1224,7 +1208,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
     }
 
-    @Override
     public void a(PacketPlayInHeldItemSlot packetplayinhelditemslot) {
         PlayerConnectionUtils.ensureMainThread(packetplayinhelditemslot, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -1245,7 +1228,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
     }
 
-    @Override
     public void a(PacketPlayInChat packetplayinchat) {
         // CraftBukkit start - async chat
         // SPIGOT-3638
@@ -1384,8 +1366,10 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
         if (!async && s.startsWith("/")) {
             // Paper Start
-            if (!org.spigotmc.AsyncCatcher.shuttingDown && !org.bukkit.Bukkit.isPrimaryThread()) {
+            if (!org.spigotmc.AsyncCatcher.shuttingDown && !Akari.isPrimaryThread()) { // Akarin
                 final String fCommandLine = s;
+                Akari.callbackQueue.add(() -> chat(fCommandLine,  false)); // Akarin
+                /* // Akarin
                 MinecraftServer.LOGGER.log(org.apache.logging.log4j.Level.ERROR, "Command Dispatched Async: " + fCommandLine);
                 MinecraftServer.LOGGER.log(org.apache.logging.log4j.Level.ERROR, "Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable());
                 Waitable wait = new Waitable() {
@@ -1404,6 +1388,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                 } catch (Exception e) {
                     throw new RuntimeException("Exception processing chat command", e.getCause());
                 }
+                */ // Akarin
             }
             // Paper End
             this.handleCommand(s);
@@ -1512,7 +1497,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         // CraftBukkit end
     }
 
-    @Override
     public void a(PacketPlayInArmAnimation packetplayinarmanimation) {
         PlayerConnectionUtils.ensureMainThread(packetplayinarmanimation, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -1521,7 +1505,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         float f1 = this.player.pitch;
         float f2 = this.player.yaw;
         double d0 = this.player.locX;
-        double d1 = this.player.locY + this.player.getHeadHeight();
+        double d1 = this.player.locY + (double) this.player.getHeadHeight();
         double d2 = this.player.locZ;
         Vec3D vec3d = new Vec3D(d0, d1, d2);
 
@@ -1532,7 +1516,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         float f7 = f4 * f5;
         float f8 = f3 * f5;
         double d3 = player.playerInteractManager.getGameMode()== EnumGamemode.CREATIVE ? 5.0D : 4.5D;
-        Vec3D vec3d1 = vec3d.add(f7 * d3, f6 * d3, f8 * d3);
+        Vec3D vec3d1 = vec3d.add((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
         MovingObjectPosition movingobjectposition = this.player.world.rayTrace(vec3d, vec3d1, false);
 
         if (movingobjectposition == null || movingobjectposition.type != MovingObjectPosition.EnumMovingObjectType.BLOCK) {
@@ -1548,7 +1532,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         this.player.a(packetplayinarmanimation.a());
     }
 
-    @Override
     public void a(PacketPlayInEntityAction packetplayinentityaction) {
         PlayerConnectionUtils.ensureMainThread(packetplayinentityaction, this, this.player.x());
         // CraftBukkit start
@@ -1650,12 +1633,11 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInUseEntity packetplayinuseentity) {
         PlayerConnectionUtils.ensureMainThread(packetplayinuseentity, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
-        Entity entity = packetplayinuseentity.a(worldserver);
+        Entity entity = packetplayinuseentity.a((World) worldserver);
         // Spigot Start
         if ( entity == player && !player.isSpectator() )
         {
@@ -1685,10 +1667,10 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                     Item origItem = this.player.inventory.getItemInHand() == null ? null : this.player.inventory.getItemInHand().getItem();
                     PlayerInteractEntityEvent event;
                     if (packetplayinuseentity.a() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT) {
-                        event = new PlayerInteractEntityEvent(this.getPlayer(), entity.getBukkitEntity(), (packetplayinuseentity.b() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
+                        event = new PlayerInteractEntityEvent((Player) this.getPlayer(), entity.getBukkitEntity(), (packetplayinuseentity.b() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
                     } else {
                         Vec3D target = packetplayinuseentity.c();
-                        event = new PlayerInteractAtEntityEvent(this.getPlayer(), entity.getBukkitEntity(), new org.bukkit.util.Vector(target.x, target.y, target.z), (packetplayinuseentity.b() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
+                        event = new PlayerInteractAtEntityEvent((Player) this.getPlayer(), entity.getBukkitEntity(), new org.bukkit.util.Vector(target.x, target.y, target.z), (packetplayinuseentity.b() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
                     }
                     this.server.getPluginManager().callEvent(event);
 
@@ -1754,7 +1736,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInClientCommand packetplayinclientcommand) {
         PlayerConnectionUtils.ensureMainThread(packetplayinclientcommand, this, this.player.x());
         this.player.resetIdleTimer();
@@ -1786,17 +1767,15 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInCloseWindow packetplayinclosewindow) {
         PlayerConnectionUtils.ensureMainThread(packetplayinclosewindow, this, this.player.x());
 
         if (this.player.isFrozen()) return; // CraftBukkit
-        CraftEventFactory.handleInventoryCloseEvent(this.player); // CraftBukkit
+        CraftEventFactory.handleInventoryCloseEvent(this.player, org.bukkit.event.inventory.InventoryCloseEvent.Reason.PLAYER); // CraftBukkit // Paper
 
         this.player.r();
     }
 
-    @Override
     public void a(PacketPlayInWindowClick packetplayinwindowclick) {
         PlayerConnectionUtils.ensureMainThread(packetplayinwindowclick, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -1807,7 +1786,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                 NonNullList nonnulllist = NonNullList.a();
 
                 for (int i = 0; i < this.player.activeContainer.slots.size(); ++i) {
-                    nonnulllist.add(this.player.activeContainer.slots.get(i).getItem());
+                    nonnulllist.add(((Slot) this.player.activeContainer.slots.get(i)).getItem());
                 }
 
                 this.player.a(this.player.activeContainer, nonnulllist);
@@ -2093,7 +2072,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                     NonNullList nonnulllist1 = NonNullList.a();
 
                     for (int j = 0; j < this.player.activeContainer.slots.size(); ++j) {
-                        ItemStack itemstack1 = this.player.activeContainer.slots.get(j).getItem();
+                        ItemStack itemstack1 = ((Slot) this.player.activeContainer.slots.get(j)).getItem();
                         ItemStack itemstack2 = itemstack1.isEmpty() ? ItemStack.a : itemstack1;
 
                         nonnulllist1.add(itemstack2);
@@ -2106,7 +2085,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInAutoRecipe packetplayinautorecipe) {
         PlayerConnectionUtils.ensureMainThread(packetplayinautorecipe, this, this.player.x());
         this.player.resetIdleTimer();
@@ -2115,7 +2093,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         }
     }
 
-    @Override
     public void a(PacketPlayInEnchantItem packetplayinenchantitem) {
         PlayerConnectionUtils.ensureMainThread(packetplayinenchantitem, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -2127,7 +2104,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInSetCreativeSlot packetplayinsetcreativeslot) {
         PlayerConnectionUtils.ensureMainThread(packetplayinsetcreativeslot, this, this.player.x());
         if (this.player.playerInteractManager.isCreative()) {
@@ -2147,7 +2123,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                         nbttagcompound1.remove("x");
                         nbttagcompound1.remove("y");
                         nbttagcompound1.remove("z");
-                        itemstack.a("BlockEntityTag", nbttagcompound1);
+                        itemstack.a("BlockEntityTag", (NBTBase) nbttagcompound1);
                     }
                 }
             }
@@ -2213,11 +2189,10 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInTransaction packetplayintransaction) {
         PlayerConnectionUtils.ensureMainThread(packetplayintransaction, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
-        Short oshort = this.k.get(this.player.activeContainer.windowId);
+        Short oshort = (Short) this.k.get(this.player.activeContainer.windowId);
 
         if (oshort != null && packetplayintransaction.b() == oshort.shortValue() && this.player.activeContainer.windowId == packetplayintransaction.a() && !this.player.activeContainer.c(this.player) && !this.player.isSpectator()) {
             this.player.activeContainer.a(this.player, true);
@@ -2225,7 +2200,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInUpdateSign packetplayinupdatesign) {
         PlayerConnectionUtils.ensureMainThread(packetplayinupdatesign, this, this.player.x());
         if (this.player.isFrozen()) return; // CraftBukkit
@@ -2261,7 +2235,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
             for (int i = 0; i < astring.length; ++i) {
                 lines[i] = SharedConstants.a(astring[i]); //Paper - Replaced with anvil color stripping method to stop exploits that allow colored signs to be created.
             }
-            SignChangeEvent event = new SignChangeEvent(player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
+            SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
             this.server.getPluginManager().callEvent(event);
 
             if (!event.isCancelled()) {
@@ -2276,7 +2250,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
-    @Override
     public void a(PacketPlayInKeepAlive packetplayinkeepalive) {
         //PlayerConnectionUtils.ensureMainThread(packetplayinkeepalive, this, this.player.x()); // CraftBukkit // Paper - This shouldn't be on the main thread
         if (this.g && packetplayinkeepalive.a() == this.h) {
@@ -2301,7 +2274,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         return System.nanoTime() / 1000000L;
     }
 
-    @Override
     public void a(PacketPlayInAbilities packetplayinabilities) {
         PlayerConnectionUtils.ensureMainThread(packetplayinabilities, this, this.player.x());
         // CraftBukkit start
@@ -2318,7 +2290,6 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     }
 
     // Paper start - async tab completion
-    @Override
     public void a(PacketPlayInTabComplete packet) {
         // CraftBukkit start
         if (chatSpamField.addAndGet(this, 10) > 500 && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) {
@@ -2365,13 +2336,11 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         // Paper end
     }
 
-    @Override
     public void a(PacketPlayInSettings packetplayinsettings) {
         PlayerConnectionUtils.ensureMainThread(packetplayinsettings, this, this.player.x());
         this.player.a(packetplayinsettings);
     }
 
-    @Override
     public void a(PacketPlayInCustomPayload packetplayincustompayload) {
         PlayerConnectionUtils.ensureMainThread(packetplayincustompayload, this, this.player.x());
         String s = packetplayincustompayload.a();
@@ -2406,7 +2375,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
                 if (itemstack.getItem() == Items.WRITABLE_BOOK && itemstack.getItem() == itemstack1.getItem()) {
                     itemstack1 = new ItemStack(Items.WRITABLE_BOOK); // CraftBukkit
-                    itemstack1.a("pages", itemstack.getTag().getList("pages", 8));
+                    itemstack1.a("pages", (NBTBase) itemstack.getTag().getList("pages", 8));
                     CraftEventFactory.handleEditBookEvent(player, itemstack1); // CraftBukkit
                 }
             } catch (Exception exception) {
@@ -2443,19 +2412,19 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                     if (itemstack.getItem() == Items.WRITABLE_BOOK && itemstack1.getItem() == Items.WRITABLE_BOOK) {
                         ItemStack itemstack2 = new ItemStack(Items.WRITTEN_BOOK);
 
-                        itemstack2.a("author", (new NBTTagString(this.player.getName())));
-                        itemstack2.a("title", (new NBTTagString(itemstack.getTag().getString("title"))));
+                        itemstack2.a("author", (NBTBase) (new NBTTagString(this.player.getName())));
+                        itemstack2.a("title", (NBTBase) (new NBTTagString(itemstack.getTag().getString("title"))));
                         NBTTagList nbttaglist = itemstack.getTag().getList("pages", 8);
 
                         for (int i = 0; i < nbttaglist.size(); ++i) {
                             s1 = nbttaglist.getString(i);
                             ChatComponentText chatcomponenttext = new ChatComponentText(s1);
 
-                            s1 = IChatBaseComponent.ChatSerializer.a(chatcomponenttext);
+                            s1 = IChatBaseComponent.ChatSerializer.a((IChatBaseComponent) chatcomponenttext);
                             nbttaglist.a(i, new NBTTagString(s1));
                         }
 
-                        itemstack2.a("pages", nbttaglist);
+                        itemstack2.a("pages", (NBTBase) nbttaglist);
                         CraftEventFactory.handleEditBookEvent(player, itemstack2); // CraftBukkit
                     }
                 } catch (Exception exception1) {
@@ -2553,7 +2522,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                         boolean flag3 = packetdataserializer.readBoolean();
 
                         if (commandblocklistenerabstract1 != null) {
-                            EnumDirection enumdirection = this.player.world.getType(blockposition).get(BlockCommand.a);
+                            EnumDirection enumdirection = (EnumDirection) this.player.world.getType(blockposition).get(BlockCommand.a);
                             IBlockData iblockdata;
 
                             switch (tileentitycommand_type) {
@@ -2673,23 +2642,23 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
                                 if (b1 == 2) {
                                     if (tileentitystructure.q()) {
-                                        this.player.a((new ChatMessage("structure_block.save_success", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.save_success", new Object[] { s7})), false);
                                     } else {
-                                        this.player.a((new ChatMessage("structure_block.save_failure", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.save_failure", new Object[] { s7})), false);
                                     }
                                 } else if (b1 == 3) {
                                     if (!tileentitystructure.E()) {
-                                        this.player.a((new ChatMessage("structure_block.load_not_found", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.load_not_found", new Object[] { s7})), false);
                                     } else if (tileentitystructure.r()) {
-                                        this.player.a((new ChatMessage("structure_block.load_success", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.load_success", new Object[] { s7})), false);
                                     } else {
-                                        this.player.a((new ChatMessage("structure_block.load_prepare", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.load_prepare", new Object[] { s7})), false);
                                     }
                                 } else if (b1 == 4) {
                                     if (tileentitystructure.p()) {
-                                        this.player.a((new ChatMessage("structure_block.size_success", new Object[] { s7})), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.size_success", new Object[] { s7})), false);
                                     } else {
-                                        this.player.a((new ChatMessage("structure_block.size_failure", new Object[0])), false);
+                                        this.player.a((IChatBaseComponent) (new ChatMessage("structure_block.size_failure", new Object[0])), false);
                                     }
                                 }
 

sources/src/main/java/net/minecraft/server/WorldData.java

@@ -47,7 +47,7 @@ public class WorldData {
     private boolean z;
     private boolean A;
     private boolean B;
-    private EnumDifficulty C;
+    private volatile EnumDifficulty C; // Akarin - volatile
     private boolean D;
     private double E;
     private double F;

sources/src/main/java/net/minecraft/server/WorldServer.java

@@ -29,17 +29,16 @@ import org.bukkit.event.weather.LightningStrikeEvent;
 /**
  * <b>Akarin Changes Note</b><br>
  * <br>
- * 1) Add lock object for per world<br>
+ * 1) Expose private members<br>
  * @author cakoyo
  */
 public class WorldServer extends World implements IAsyncTaskHandler {
-    public final Object tickLock = new Object(); // Akarin - in case concurrently tick one world
 
     private static final Logger a = LogManager.getLogger();
     boolean stopPhysicsEvent = false; // Paper
     private final MinecraftServer server;
     public EntityTracker tracker;
-    private final PlayerChunkMap manager;
+    public final PlayerChunkMap manager; // Akarin - private -> public
     // private final Set<NextTickListEntry> nextTickListHash = Sets.newHashSet();
     private final HashTreeSet<NextTickListEntry> nextTickList = new HashTreeSet<NextTickListEntry>(); // CraftBukkit - HashTreeSet
     private final Map<UUID, Entity> entitiesByUUID = Maps.newHashMap();
@@ -278,15 +277,16 @@ public class WorldServer extends World implements IAsyncTaskHandler {
     @Override
     public void doTick() {
         super.doTick();
-        if (this.getWorldData().isHardcore() && this.getDifficulty() != EnumDifficulty.HARD) {
+        // Akarin start - goes to slack service
+        /* if (this.getWorldData().isHardcore() && this.getDifficulty() != EnumDifficulty.HARD) {
             this.getWorldData().setDifficulty(EnumDifficulty.HARD);
-        }
+        } */ // Akarin end
 
         this.worldProvider.k().b();
         if (this.everyoneDeeplySleeping()) {
             if (this.getGameRules().getBoolean("doDaylightCycle")) {
                 long i = this.worldData.getDayTime() + 24000L;
-
+                
                 this.worldData.setDayTime(i - i % 24000L);
             }
 
@@ -1229,6 +1229,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
 
     @Override
     protected void c(Entity entity) {
+        if (!entity.valid) return; // Paper - Already removed, dont fire twice - this looks like it can happen even without our changes
         super.c(entity);
         this.entitiesById.d(entity.getId());
         this.entitiesByUUID.remove(entity.getUniqueID());

sources/src/main/resources/configurations/bukkit.yml

@@ -0,0 +1,37 @@
+# This is the main configuration file for Bukkit.
+# As you can see, there's actually not that much to configure without any plugins.
+# For a reference for any variable inside this file, check out the Bukkit Wiki at
+# http://wiki.bukkit.org/Bukkit.yml
+# 
+# If you need help on this file, feel free to join us on irc or leave a message
+# on the forums asking for advice.
+# 
+# IRC: #spigot @ irc.spi.gt
+#    (If this means nothing to you, just go to http://www.spigotmc.org/pages/irc/ )
+# Forums: http://www.spigotmc.org/
+# Bug tracker: http://www.spigotmc.org/go/bugs
+
+
+settings:
+    allow-end: true
+    warn-on-overload: true
+    permissions-file: permissions.yml
+    update-folder: update
+    plugin-profiling: false
+    connection-throttle: 4000
+    query-plugins: false
+    deprecated-verbose: default
+    shutdown-message: "Server closed"
+spawn-limits:
+    monsters: 70
+    animals: 15
+    water-animals: 5
+    ambient: 15
+chunk-gc:
+    period-in-ticks: 600
+    load-threshold: 0
+ticks-per:
+    animal-spawns: 400
+    monster-spawns: 1
+    autosave: 6000
+aliases: now-in-commands.yml

sources/src/main/resources/mixins.akarin.core.json

@@ -1,6 +1,6 @@
 {
     "required": true,
-    "minVersion": "0",
+    "minVersion": "0.7.10",
     "package": "io.akarin.server.mixin",
     "target": "@env(DEFAULT)",
     "compatibilityLevel": "JAVA_8",
@@ -11,17 +11,28 @@
         "bootstrap.MixinMetrics",
         "bootstrap.ParallelRegistry",
         "bootstrap.MetricsBootstrap",
+        "bootstrap.MixinRestartCommand",
         
+        "core.MixinWorld",
         "core.MixinMCUtil",
-        "core.DesyncCatcher",
+        "core.MixinPlayerList",
+        "core.MixinCommandBan",
+        "core.MixinCommandKick",
         "core.MixinCraftServer",
+        "core.MixinWorldServer",
+        "core.MixinCommandBanIp",
+        "core.MixinChunkSection",
+        "core.MixinAsyncCatcher",
         "core.MixinTimingHandler",
-		"core.MonsterEggGuardian",
+        "core.MonsterEggGuardian",
         "core.MixinVersionCommand",
         "core.MixinMinecraftServer",
         "core.MixinChunkIOExecutor",
+        "core.MixinPlayerConnectionUtils",
+        
+        "cps.MixinCraftWorld",
+        "cps.MixinChunkProviderServer",
         
-        "nsc.MixinPlayerConnection",
         "nsc.OptimisticNetworkManager",
         "nsc.NonblockingServerConnection",
         
@@ -29,6 +40,7 @@
         "optimization.WeakEnchantmentManager",
         "optimization.MixinEntityHorseAbstract",
         "optimization.MixinEntityTameableAnimal",
+        "optimization.MixinPersistentCollection",
         "optimization.MixinTileEntityEnchantTable"
     ]
 }

sources/src/main/resources/mixins.akarin.optimization.lighting.json

@@ -0,0 +1,15 @@
+{
+    "required": true,
+    "minVersion": "0.7.10",
+    "package": "io.akarin.server.mixin",
+    "target": "@env(DEFAULT)",
+    "compatibilityLevel": "JAVA_8",
+    "server": [
+        "cps.MixinChunk",
+        
+        "lighting.MixinChunk",
+        "lighting.MixinWorld",
+        "lighting.MixinWorldServer",
+        "lighting.MixinChunkProviderServer",
+    ]
+}

sources/src/main/resources/mixins.akarin.optimization.pandawire.json

@@ -0,0 +1,10 @@
+{
+    "required": true,
+    "minVersion": "0.7.10",
+    "package": "io.akarin.server.mixin",
+    "target": "@env(DEFAULT)",
+    "compatibilityLevel": "JAVA_8",
+    "server": [
+        "optimization.PandaRedstoneWire",
+    ]
+}

sources/src/main/resources/mixins.akarin.optimization.realtime.json

@@ -0,0 +1,24 @@
+{
+    "required": true,
+    "minVersion": "0.7.10",
+    "package": "io.akarin.server.mixin",
+    "target": "@env(DEFAULT)",
+    "compatibilityLevel": "JAVA_8",
+    "server": [
+        "realtime.MixinWorld",
+        "realtime.MixinEntity",
+        "realtime.MixinEntityItem",
+        "realtime.MixinWorldServer",
+        "realtime.MixinEntityHuman",
+        "realtime.MixinEntityPlayer",
+        "realtime.MixinEntityAgeable",
+        "realtime.MixinMinecraftServer",
+        "realtime.MixinEntityInsentient",
+        "realtime.MixinPlayerConnection",
+        "realtime.MixinTileEntityFurnace",
+        "realtime.MixinEntityExperienceOrb",
+        "realtime.MixinEntityZombieVillager",
+        "realtime.MixinPlayerInteractManager",
+        "realtime.MixinTileEntityBrewingStand",
+    ]
+}