Cleanup w/ confirm upstream for direct-import classes

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

@@ -9,6 +9,6 @@ import net.minecraft.server.PlayerConnection;
 public class MixinPlayerConnection {
     @Overwrite
     private long d() {
-        return System.currentTimeMillis();
+        return System.currentTimeMillis(); // nanoTime() / 1000000L
     }
 }

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

@@ -17,6 +17,7 @@ import io.netty.handler.timeout.TimeoutException;
 import io.netty.util.AttributeKey;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
+
 import java.net.SocketAddress;
 import java.util.Queue;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -34,7 +35,6 @@ import org.apache.logging.log4j.MarkerManager;
  * <br>
  * 1) Add volatile to fields<br>
  * 2) Expose private members<br>
- * 3) Change writeLock back to readLock (Paper Anti-XRay modification) by integrating checks
  * @author cakoyo
  */
 public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {

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

@@ -107,7 +107,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
     private int receivedMovePackets;
     private int processedMovePackets;
     private AutoRecipe H = new AutoRecipe();
-    private static final long KEEPALIVE_LIMIT = /*Long.getLong("paper.playerconnection.keepalive", 30)*/ AkarinGlobalConfig.keepAliveTimeout * 1000; // Paper - provide property to set keepalive limit // Akarin - more accessible - keep for compatibility
+    private static final long KEEPALIVE_LIMIT = /*Long.getLong("paper.playerconnection.keepalive", 30)*/ AkarinGlobalConfig.keepAliveTimeout * 1000; // Paper - provide property to set keepalive limit // Akarin - more accessible - keep changes
 
     public PlayerConnection(MinecraftServer minecraftserver, NetworkManager networkmanager, EntityPlayer entityplayer) {
         this.minecraftServer = minecraftserver;
@@ -1154,7 +1154,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         // CraftBukkit start - Rarely it would send a disconnect line twice
         if (this.processedDisconnect) {
             return;
-        }else {
+        } else {
             this.processedDisconnect = true;
         }
         // CraftBukkit end

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

@@ -3,7 +3,6 @@ package net.minecraft.server;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.util.concurrent.ListenableFuture;
-
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -30,10 +29,11 @@ import org.bukkit.event.weather.LightningStrikeEvent;
 /**
  * <b>Akarin Changes Note</b><br>
  * <br>
- * 1) Add tick lock for per world<br>
+ * 1) Add lock object for per world<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
@@ -52,8 +52,6 @@ public class WorldServer extends World implements IAsyncTaskHandler {
     private final WorldServer.BlockActionDataList[] U = new WorldServer.BlockActionDataList[] { new WorldServer.BlockActionDataList(null), new WorldServer.BlockActionDataList(null)};
     private int V;
     private final List<NextTickListEntry> W = Lists.newArrayList();
-    
-    public final Object tickLock = new Object(); // Akarin - in case concurrently tick one world
 
     // CraftBukkit start
     public final int dimension;