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Avoid blocking on Network Manager creation

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Fixes #294

Use a pending list to handle new connections so that the netty threads
do not block waiting for the main thread to finish ticking
This commit is contained in:
Aikar 2016-05-16 23:21:26 -04:00
parent 2c6feab963
commit d22f9071ff
1 changed files with 49 additions and 0 deletions
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Spigot-Server-Patches/0158-Avoid-blocking-on-Network-Manager-creation.patch Normal file
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@ -0,0 +1,49 @@
From 35daee4c95827a178f1f80c336d4e100f64fa91f 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 4ab28e6..08634c3 100644
--- a/src/main/java/net/minecraft/server/ServerConnection.java
+++ b/src/main/java/net/minecraft/server/ServerConnection.java
@@ -60,6 +60,17 @@ public class ServerConnection {
public volatile boolean d;
private final List<ChannelFuture> g = Collections.synchronizedList(Lists.<ChannelFuture>newArrayList());
private final List<NetworkManager> h = Collections.synchronizedList(Lists.<NetworkManager>newArrayList());
+ // Paper start - prevent blocking on adding a new network manager while the server is ticking
+ private final List<NetworkManager> pending = Collections.synchronizedList(Lists.<NetworkManager>newArrayList());
+ private void addPending() {
+ synchronized (pending) {
+ synchronized (this.h) { // Paper // OBFHELPER - List of network managers
+ this.h.addAll(pending);
+ pending.clear();
+ }
+ }
+ }
+ // Paper end
public ServerConnection(MinecraftServer minecraftserver) {
this.f = minecraftserver;
@@ -94,7 +105,7 @@ public class ServerConnection {
channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(ServerConnection.this)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder(EnumProtocolDirection.SERVERBOUND)).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder(EnumProtocolDirection.CLIENTBOUND));
NetworkManager networkmanager = new NetworkManager(EnumProtocolDirection.SERVERBOUND);
- ServerConnection.this.h.add(networkmanager);
+ pending.add(networkmanager); // Paper
channel.pipeline().addLast("packet_handler", networkmanager);
networkmanager.setPacketListener(new HandshakeListener(ServerConnection.this.f, networkmanager));
}
@@ -123,6 +134,7 @@ public class ServerConnection {
synchronized (this.h) {
// Spigot Start
+ 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 )
{
--
2.8.2