Paper/Spigot-Server-Patches/0099-Avoid-blocking-on-Network-Manager-creation.patch
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[CI-SKIP] Remove Waving banner fix (#4786)
Mojang fixed it in MC-63720
2020-11-19 10:15:16 -05:00

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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/ServerConnection.java b/src/main/java/net/minecraft/server/ServerConnection.java
index 399420916da4c924cd28c0c4a45b4eca3972acb6..8fcd8f4056620713d0c02fdd9b829053ba95e851 100644
--- a/src/main/java/net/minecraft/server/ServerConnection.java
+++ b/src/main/java/net/minecraft/server/ServerConnection.java
@@ -39,6 +39,15 @@ public class ServerConnection {
public volatile boolean c;
private final List<ChannelFuture> listeningChannels = Collections.synchronizedList(Lists.newArrayList());
private final List<NetworkManager> connectedChannels = Collections.synchronizedList(Lists.newArrayList());
+ // Paper start - prevent blocking on adding a new network manager while the server is ticking
+ private final java.util.Queue<NetworkManager> pending = new java.util.concurrent.ConcurrentLinkedQueue<>();
+ private void addPending() {
+ NetworkManager manager = null;
+ while ((manager = pending.poll()) != null) {
+ connectedChannels.add(manager);
+ }
+ }
+ // Paper end
public ServerConnection(MinecraftServer minecraftserver) {
this.e = minecraftserver;
@@ -74,7 +83,8 @@ public class ServerConnection {
int j = ServerConnection.this.e.k();
Object object = j > 0 ? new NetworkManagerServer(j) : new NetworkManager(EnumProtocolDirection.SERVERBOUND);
- ServerConnection.this.connectedChannels.add((NetworkManager) object); // CraftBukkit - decompile error
+ //ServerConnection.this.connectedChannels.add((NetworkManager) object); // CraftBukkit - decompile error
+ pending.add((NetworkManager) object); // Paper
channel.pipeline().addLast("packet_handler", (ChannelHandler) object);
((NetworkManager) object).setPacketListener(new HandshakeListener(ServerConnection.this.e, (NetworkManager) object));
}
@@ -113,6 +123,7 @@ public class ServerConnection {
synchronized (this.connectedChannels) {
// 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 )
{