papermc/Spigot-Server-Patches/0399-Optimise-IEntityAccess-getPlayerByUUID.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 11 Jan 2020 21:50:56 -0800
Subject: [PATCH] Optimise IEntityAccess#getPlayerByUUID

Use the world entity map instead of iterating over all players

diff --git a/src/main/java/net/minecraft/server/IEntityAccess.java b/src/main/java/net/minecraft/server/IEntityAccess.java
index b6cf294e785b36b8bc800f26dbb8cfcb2119eae1..1cb8ba7cd28cdb8a660c2d78d35e86cd5cf08a8f 100644
--- a/src/main/java/net/minecraft/server/IEntityAccess.java
+++ b/src/main/java/net/minecraft/server/IEntityAccess.java
@@ -243,6 +243,12 @@ public interface IEntityAccess {
 
     @Nullable
     default EntityHuman b(UUID uuid) {
+        // Paper start - allow WorldServer to override
+        return this.getPlayerByUUID(uuid);
+    }
+    @Nullable
+    default EntityHuman getPlayerByUUID(UUID uuid) {
+        // Paper end
         for (int i = 0; i < this.getPlayers().size(); ++i) {
             EntityHuman entityhuman = (EntityHuman) this.getPlayers().get(i);
 
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 08e422310d94f325734994f31411ce22b35cc4b4..c417b5fae91ab681c44101c8ac233437a0a82343 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -173,6 +173,15 @@ public class WorldServer extends World implements GeneratorAccessSeed {
     }
     // Paper end
 
+    // Paper start - optimise getPlayerByUUID
+    @Nullable
+    @Override
+    public EntityHuman getPlayerByUUID(UUID uuid) {
+        Entity player = this.entitiesByUUID.get(uuid);
+        return (player instanceof EntityHuman) ? (EntityHuman)player : null;
+    }
+    // Paper end
+
     // Add env and gen to constructor, WorldData -> WorldDataServer
     public WorldServer(MinecraftServer minecraftserver, Executor executor, Convertable.ConversionSession convertable_conversionsession, IWorldDataServer iworlddataserver, ResourceKey<World> resourcekey, DimensionManager dimensionmanager, WorldLoadListener worldloadlistener, ChunkGenerator chunkgenerator, boolean flag, long i, List<MobSpawner> list, boolean flag1, org.bukkit.World.Environment env, org.bukkit.generator.ChunkGenerator gen) {
         super(iworlddataserver, resourcekey, dimensionmanager, minecraftserver::getMethodProfiler, false, flag, i, gen, env, executor); // Paper pass executor