From 05e214f72ca86351ac42b9c56a191fedf7d9e2e4 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 13 Apr 2016 00:25:28 -0400
Subject: [PATCH] Remove unused World Tile Entity List

Massive hit to performance and it is completely unnecessary.

diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 9672248c7..1dccc2e0d 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -36,7 +36,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
 
     protected static final Logger LOGGER = LogManager.getLogger();
     private static final EnumDirection[] a = EnumDirection.values();
-    public final List<TileEntity> tileEntityList = Lists.newArrayList();
+    //public final List<TileEntity> tileEntityList = Lists.newArrayList(); // Paper - remove unused list
     public final List<TileEntity> tileEntityListTick = Lists.newArrayList();
     protected final List<TileEntity> tileEntityListPending = Lists.newArrayList();
     protected final java.util.Set<TileEntity> tileEntityListUnload = com.google.common.collect.Sets.newHashSet();
@@ -602,9 +602,9 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                     }, tileentity::getPosition});
         }
 
-        boolean flag = this.tileEntityList.add(tileentity);
+        boolean flag = true; // Paper - remove unused list
 
-        if (flag && tileentity instanceof ITickable) {
+        if (flag && tileentity instanceof ITickable && !this.tileEntityListTick.contains(tileentity)) { // Paper
             this.tileEntityListTick.add(tileentity);
         }
 
@@ -640,7 +640,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
         timings.tileEntityTick.startTiming(); // Spigot
         if (!this.tileEntityListUnload.isEmpty()) {
             this.tileEntityListTick.removeAll(this.tileEntityListUnload);
-            this.tileEntityList.removeAll(this.tileEntityListUnload);
+            //this.tileEntityList.removeAll(this.tileEntityListUnload); // Paper - remove unused list
             this.tileEntityListUnload.clear();
         }
 
@@ -701,7 +701,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                 tilesThisCycle--;
                 this.tileEntityListTick.remove(tileTickPosition--);
                 // Spigot end
-                this.tileEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 if (this.isLoaded(tileentity.getPosition())) {
                     this.getChunkAtWorldCoords(tileentity.getPosition()).removeTileEntity(tileentity.getPosition());
                 }
@@ -731,7 +731,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                         this.notify(tileentity1.getPosition(), iblockdata, iblockdata, 3);
                         // CraftBukkit start
                         // From above, don't screw this up - SPIGOT-1746
-                        if (!this.tileEntityList.contains(tileentity1)) {
+                        if (true) { // Paper - remove unused list
                             this.a(tileentity1);
                         }
                         // CraftBukkit end
@@ -997,7 +997,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
         } else {
             if (tileentity != null) {
                 this.tileEntityListPending.remove(tileentity);
-                this.tileEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 this.tileEntityListTick.remove(tileentity);
             }
 
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 2f1857dbb..92745505a 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -1629,7 +1629,7 @@ public class WorldServer extends World {
             }
 
             bufferedwriter.write(String.format("entities: %d\n", this.entitiesById.size()));
-            bufferedwriter.write(String.format("block_entities: %d\n", this.tileEntityList.size()));
+            bufferedwriter.write(String.format("block_entities: %d\n", this.tileEntityListTick.size())); // Paper - remove unused list
             bufferedwriter.write(String.format("block_ticks: %d\n", this.getBlockTickList().a()));
             bufferedwriter.write(String.format("fluid_ticks: %d\n", this.getFluidTickList().a()));
             bufferedwriter.write("distance_manager: " + playerchunkmap.e().c() + "\n");
@@ -1792,7 +1792,7 @@ public class WorldServer extends World {
 
     private void a(Writer writer) throws IOException {
         CSVWriter csvwriter = CSVWriter.a().a("x").a("y").a("z").a("type").a(writer);
-        Iterator iterator = this.tileEntityList.iterator();
+        Iterator iterator = this.tileEntityListTick.iterator(); // Paper - remove unused list
 
         while (iterator.hasNext()) {
             TileEntity tileentity = (TileEntity) iterator.next();
-- 
2.25.0