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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 dbbca784fe45b7099f683745b36f5c195ca4c2af..187b2cf175ba5cea94158d29b53993dc5a7c5b94 100644
--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
+++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
@@ -61,6 +61,15 @@ 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 connection while the server is ticking
+ private final java.util.Queue<Connection> pending = new java.util.concurrent.ConcurrentLinkedQueue<>();
+ private final void addPending() {
+ Connection connection;
+ while ((connection = pending.poll()) != null) {
+ connections.add(connection);
+ }
+ }
+ // Paper end - prevent blocking on adding a new connection while the server is ticking
public ServerConnectionListener(MinecraftServer server) {
this.server = server;
@@ -100,7 +109,8 @@ public class ServerConnectionListener {
int j = ServerConnectionListener.this.server.getRateLimitPacketsPerSecond();
Connection object = j > 0 ? new RateKickingConnection(j) : new Connection(PacketFlow.SERVERBOUND); // CraftBukkit - decompile error
- ServerConnectionListener.this.connections.add(object);
+ //ServerConnectionListener.this.connections.add(object); // Paper
+ pending.add(object); // Paper - prevent blocking on adding a new connection while the server is ticking
((Connection) object).configurePacketHandler(channelpipeline);
((Connection) object).setListenerForServerboundHandshake(new ServerHandshakePacketListenerImpl(ServerConnectionListener.this.server, (Connection) object));
}
@@ -163,6 +173,7 @@ public class ServerConnectionListener {
synchronized (this.connections) {
// Spigot Start
+ this.addPending(); // Paper - prevent blocking on adding a new connection while the server is ticking
// 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 )
{
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