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Paper/patches/server/0104-Avoid-blocking-on-Network-Manager-creation.patch
2023-02-19 08:57:10 -06:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 16 May 2016 23:19:16 -0400
Subject: [PATCH] Avoid blocking on Network Manager creation
Per Paper issue 294
diff --git a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
index a44520e8fb35d349d6481f369e39db1fdb475749..0e04532b8f1d48116eb46dcef7952bfcc0d11394 100644
--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
+++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
@@ -63,6 +63,15 @@ public class ServerConnectionListener {
public volatile boolean running;
private final List<ChannelFuture> channels = Collections.synchronizedList(Lists.newArrayList());
final List<Connection> connections = Collections.synchronizedList(Lists.newArrayList());
+ // Paper start - prevent blocking on adding a new network manager while the server is ticking
+ private final java.util.Queue<Connection> pending = new java.util.concurrent.ConcurrentLinkedQueue<>();
+ private final void addPending() {
+ Connection manager = null;
+ while ((manager = pending.poll()) != null) {
+ connections.add(manager);
+ }
+ }
+ // Paper end
public ServerConnectionListener(MinecraftServer server) {
this.server = server;
@@ -98,7 +107,8 @@ public class ServerConnectionListener {
int j = ServerConnectionListener.this.server.getRateLimitPacketsPerSecond();
Object object = j > 0 ? new RateKickingConnection(j) : new Connection(PacketFlow.SERVERBOUND);
- ServerConnectionListener.this.connections.add((Connection) object); // CraftBukkit - decompile error
+ // ServerConnectionListener.this.connections.add((Connection) object); // CraftBukkit - decompile error
+ pending.add((Connection) object); // Paper
channel.pipeline().addLast("packet_handler", (ChannelHandler) object);
((Connection) object).setListener(new ServerHandshakePacketListenerImpl(ServerConnectionListener.this.server, (Connection) object));
}
@@ -157,6 +167,7 @@ public class ServerConnectionListener {
synchronized (this.connections) {
// Spigot Start
+ this.addPending(); // Paper
// This prevents players from 'gaming' the server, and strategically relogging to increase their position in the tick order
if ( org.spigotmc.SpigotConfig.playerShuffle > 0 && MinecraftServer.currentTick % org.spigotmc.SpigotConfig.playerShuffle == 0 )
{