Paper/Spigot-Server-Patches/0271-Use-a-Queue-for-Queueing-Commands.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 12 Aug 2018 02:33:39 -0400
Subject: [PATCH] Use a Queue for Queueing Commands

Lists are bad as Queues mmmkay.

diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
index f6544e4fb0eacce7f3579998e8ec0743b7f46c65..715063432bb3a18421f7ac00723f6695f8a56a8c 100644
--- a/src/main/java/net/minecraft/server/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/DedicatedServer.java
@@ -38,7 +38,7 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
 
     private static final Logger LOGGER = LogManager.getLogger();
     private static final Pattern k = Pattern.compile("^[a-fA-F0-9]{40}$");
-    private final List<ServerCommand> serverCommandQueue = Collections.synchronizedList(Lists.newArrayList());
+    private final java.util.Queue<ServerCommand> serverCommandQueue = new java.util.concurrent.ConcurrentLinkedQueue<>(); // Paper - use a proper queue
     private RemoteStatusListener remoteStatusListener;
     public final RemoteControlCommandListener remoteControlCommandListener;
     private RemoteControlListener remoteControlListener;
@@ -395,8 +395,10 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
 
     public void handleCommandQueue() {
         MinecraftTimings.serverCommandTimer.startTiming(); // Spigot
-        while (!this.serverCommandQueue.isEmpty()) {
-            ServerCommand servercommand = (ServerCommand) this.serverCommandQueue.remove(0);
+        // Paper start - use proper queue
+        ServerCommand servercommand;
+        while ((servercommand = this.serverCommandQueue.poll()) != null) {
+            // Paper end
 
             // CraftBukkit start - ServerCommand for preprocessing
             ServerCommandEvent event = new ServerCommandEvent(console, servercommand.command);