Closes #1283: Add custom Callable to prevent memory leaks

src/main/java/appeng/util/BlockUpdate.java

@@ -19,30 +19,25 @@
 package appeng.util;
 
 
-import java.util.concurrent.Callable;
-
 import net.minecraft.util.BlockPos;
 import net.minecraft.world.World;
 
 
-public class BlockUpdate implements Callable
+public class BlockUpdate implements IWorldCallable<Boolean>
 {
-
-	final World w;
 	final BlockPos pos;
 
-	public BlockUpdate( World w, BlockPos pos )
+	public BlockUpdate( BlockPos pos )
 	{
-		this.w = w;
 		this.pos=pos;
 	}
 
 	@Override
-	public Object call() throws Exception
+	public Boolean call( World world ) throws Exception
 	{
-		if( this.w.isBlockLoaded( this.pos ) )
+		if ( world.isBlockLoaded( this.pos ) )
 		{
-			this.w.notifyNeighborsOfStateChange( this.pos, Platform.AIR_BLOCK );
+			world.notifyNeighborsOfStateChange( this.pos, Platform.AIR_BLOCK );
 		}
 
 		return true;