Re-add thread configurations for async lighting w/ Removed craps

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

@@ -185,6 +185,16 @@ public class AkarinGlobalConfig {
         keepAliveTimeout = getSeconds(getString("core.keep-alive-response-timeout", "30s")) * 1000;
     }
     
+    public static int asyncLightingThreads;
+    private static void asyncLightingThreads() {
+        asyncLightingThreads = getInt("core.async-lighting.executor-threads", 2);
+    }
+    
+    public static boolean asyncLightingWorkStealing;
+    private static void asyncLightingWorkStealing() {
+        asyncLightingWorkStealing = getBoolean("core.async-lighting.use-work-stealing", false);
+    }
+    
     public static boolean throwOnAsyncCaught;
     private static void throwOnAsyncCaught() {
         throwOnAsyncCaught = getBoolean("core.thread-safe.async-catcher.throw-on-caught", true);

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

@@ -18,10 +18,10 @@ public class AkarinSlackScheduler extends Thread {
         return Singleton.instance;
     }
     
-    public static void boot() {
+    public void boot() {
-        Singleton.instance.setName("Akarin Slack Scheduler Thread");
+        setName("Akarin Slack Scheduler Thread");
-        Singleton.instance.setDaemon(true);
+        setDaemon(true);
-        Singleton.instance.start();
+        start();
         Akari.logger.info("Slack scheduler service started");
     }
     

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

@@ -7,7 +7,6 @@ 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 {
@@ -23,7 +22,6 @@ public abstract class MixinAsyncCatcher {
             } else {
                 Akari.logger.warn("Asynchronous " + reason + "!");
                 Thread.dumpStack();
-                PersistentCollection.class.getName();
             }
         }
     }

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

@@ -59,7 +59,7 @@ public abstract class MixinMinecraftServer {
             WorldServer world = worlds.get(i);
             TileEntityHopper.skipHopperEvents = world.paperConfig.disableHopperMoveEvents || InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0;
         }
-        AkarinSlackScheduler.boot();
+        AkarinSlackScheduler.get().boot();
     }
     
     @Overwrite

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

@@ -68,7 +68,7 @@ public abstract class MixinChunk implements IMixinChunk {
     private CopyOnWriteArrayList<Short> queuedBlockLightingUpdates = new CopyOnWriteArrayList<>();
     private AtomicInteger pendingLightUpdates = new AtomicInteger();
     private long lightUpdateTime;
-    private ExecutorService lightExecutorService;
+    private static ExecutorService lightExecutorService;
     
     @Shadow(aliases = "m") private boolean isGapLightingUpdated;
     @Shadow(aliases = "r") private boolean ticked;

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

@@ -27,8 +27,6 @@ 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;
@@ -37,6 +35,7 @@ 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 io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.BlockPosition;
 import net.minecraft.server.Chunk;
 import net.minecraft.server.EnumDirection;
@@ -55,11 +54,12 @@ public abstract class MixinWorldServer extends MixinWorld implements IMixinWorld
     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 static ExecutorService getExecutorService() {
-    private ExecutorService getExecutorService() {
+        return AkarinGlobalConfig.asyncLightingWorkStealing ?
-        return Executors.newFixedThreadPool(1, SERVICE_FACTORY);
+                Executors.newFixedThreadPool(AkarinGlobalConfig.asyncLightingThreads, new ThreadFactoryBuilder().setNameFormat("Akarin Async Light Thread").build())
+                :
+                Executors.newWorkStealingPool(AkarinGlobalConfig.asyncLightingThreads);
     }
     
     @Override