From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Sat, 13 Jan 2024 13:36:55 +0300
Subject: [PATCH] Optimize CraftServer.getWorld(UUID)

Original code by MultiPaper - https://github.com/MultiPaper/MultiPaper

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 070a5ff6e16aa9f316489f7a1b812d84da2f6a60..63002b42a817bccda5a1587f8d349b38ebbf7c4d 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -264,6 +264,8 @@ import net.md_5.bungee.api.chat.BaseComponent; // Spigot
 import javax.annotation.Nullable; // Paper
 import javax.annotation.Nonnull; // Paper
 
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap; // DivineMC
+
 public final class CraftServer implements Server {
     private final String serverName = "DivineMC"; // Paper // Pufferfish // Purpur // DivineMC
     private final String serverVersion;
@@ -280,6 +282,7 @@ public final class CraftServer implements Server {
     protected final DedicatedServer console;
     protected final DedicatedPlayerList playerList;
     private final Map<String, World> worlds = new LinkedHashMap<String, World>();
+    private final Map<UUID, World> worldsByUUID = new Object2ObjectLinkedOpenHashMap<>(); // DivineMC - MultiPaper - optimize getWorld(UUID)
     private final Map<Class<?>, Registry<?>> registries = new HashMap<>();
     private YamlConfiguration configuration;
     private YamlConfiguration commandsConfiguration;
@@ -1465,6 +1468,7 @@ public final class CraftServer implements Server {
             this.getLogger().log(Level.SEVERE, null, ex);
         }
 
+        this.worldsByUUID.remove(world.getUID()); // DivineMC - MultiPaper - optimize getWorld(UUID)
         this.worlds.remove(world.getName().toLowerCase(java.util.Locale.ENGLISH));
         this.console.removeLevel(handle);
         return true;
@@ -1483,6 +1487,7 @@ public final class CraftServer implements Server {
 
     @Override
     public World getWorld(UUID uid) {
+        if (true) return this.worldsByUUID.get(uid); // DivineMC - MultiPaper - optimize getWorld(UUID)
         for (World world : this.worlds.values()) {
             if (world.getUID().equals(uid)) {
                 return world;
@@ -1506,6 +1511,7 @@ public final class CraftServer implements Server {
             System.out.println("World " + world.getName() + " is a duplicate of another world and has been prevented from loading. Please delete the uid.dat file from " + world.getName() + "'s world directory if you want to be able to load the duplicate world.");
             return;
         }
+        this.worldsByUUID.put(world.getUID(), world); // DivineMC - MultiPaper - optimize getWorld(UUID)
         this.worlds.put(world.getName().toLowerCase(java.util.Locale.ENGLISH), world);
     }