From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: vemacs <d@nkmem.es>
Date: Wed, 23 Nov 2016 08:31:45 -0500
Subject: [PATCH] Cache user authenticator threads


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 0597c0c3e881dd43cf91bd3088ed30dfecfe8098..175bf535066afc42de8a3f0d11c46af66f3e3e52 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1388,7 +1388,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
                         }
                     }
 
-                    player.entitiesToRemove.remove(Integer.valueOf(this.entity.getId()));
+                    player.removeQueue.remove(Integer.valueOf(this.entity.getId()));
                     // CraftBukkit end
 
                     if (flag1 && this.trackedPlayerMap.putIfAbsent(player, true) == null) { // Paper
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 3a2356b3e00098d100a179a05316f402390d4e9b..3cde25c2479adcc4ce3014e5ac2ec0710bffeea9 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -4,7 +4,9 @@ import com.google.common.collect.Lists;
 import com.mojang.authlib.GameProfile;
 import com.mojang.datafixers.util.Either;
 import com.mojang.serialization.DataResult;
+import java.util.ArrayDeque; // Paper
 import java.util.Collection;
+import java.util.Deque; // Paper
 import java.util.Iterator;
 import java.util.List;
 import java.util.Optional;
@@ -169,7 +171,7 @@ public class ServerPlayer extends Player implements ContainerListener {
     public ServerGamePacketListenerImpl connection;
     public final MinecraftServer server;
     public final ServerPlayerGameMode gameMode;
-    public final List<Integer> entitiesToRemove = Lists.newLinkedList();
+    public final Deque<Integer> removeQueue = new ArrayDeque<>(); // Paper
     private final PlayerAdvancements advancements;
     private final ServerStatsCounter stats;
     private float lastRecordedHealthAndAbsorption = Float.MIN_VALUE;
@@ -544,16 +546,23 @@ public class ServerPlayer extends Player implements ContainerListener {
             this.containerMenu = this.inventoryMenu;
         }
 
-        while (!this.entitiesToRemove.isEmpty()) {
-            int i = Math.min(this.entitiesToRemove.size(), Integer.MAX_VALUE);
+        while (!this.removeQueue.isEmpty()) {
+            int i = Math.min(this.removeQueue.size(), Integer.MAX_VALUE);
             int[] aint = new int[i];
-            Iterator<Integer> iterator = this.entitiesToRemove.iterator();
+            //Iterator<Integer> iterator = this.removeQueue.iterator(); // Paper
             int j = 0;
 
-            while (iterator.hasNext() && j < i) {
+            // Paper start
+            /* while (iterator.hasNext() && j < i) {
                 aint[j++] = (Integer) iterator.next();
                 iterator.remove();
+            } */
+
+            Integer integer;
+            while (j < i && (integer = this.removeQueue.poll()) != null) {
+                aint[j++] = integer.intValue();
             }
+            // Paper end
 
             this.connection.send(new ClientboundRemoveEntitiesPacket(aint));
         }
@@ -1558,7 +1567,14 @@ public class ServerPlayer extends Player implements ContainerListener {
         this.lastSentHealth = -1.0F;
         this.lastSentFood = -1;
         // this.recipeBook.a((RecipeBook) entityplayer.recipeBook); // CraftBukkit
-        this.entitiesToRemove.addAll(oldPlayer.entitiesToRemove);
+        // Paper start - Optimize remove queue - vanilla copies player objects, but CB doesn't. This method currently only
+        // Applies to the same player, so we need to not duplicate our removal queue. The rest of this method does "resetting"
+        // type logic so it does need to be called, maybe? This is silly.
+        // this.removeQueue.addAll(entityplayer.removeQueue);
+        if (this.removeQueue != oldPlayer.removeQueue) {
+            this.removeQueue.addAll(oldPlayer.removeQueue);
+        }
+        // Paper end
         this.seenCredits = oldPlayer.seenCredits;
         this.enteredNetherPosition = oldPlayer.enteredNetherPosition;
         this.setShoulderEntityLeft(oldPlayer.getShoulderEntityLeft());
@@ -1748,13 +1764,13 @@ public class ServerPlayer extends Player implements ContainerListener {
         if (entity instanceof Player) {
             this.connection.send(new ClientboundRemoveEntitiesPacket(new int[]{entity.getId()}));
         } else {
-            this.entitiesToRemove.add((Integer) entity.getId()); // CraftBukkit - decompile error
+            this.removeQueue.add((Integer) entity.getId()); // CraftBukkit - decompile error
         }
 
     }
 
     public void cancelRemoveEntity(Entity entity) {
-        this.entitiesToRemove.remove((Integer) entity.getId()); // CraftBukkit - decompile error
+        this.removeQueue.remove((Integer) entity.getId()); // CraftBukkit - decompile error
     }
 
     @Override