0012-Consolidate-flush-calls-for-entity-tracker-packets.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: hpfxd <me@hpfxd.com>
Date: Fri, 29 Oct 2021 08:08:48 -0400
Subject: [PATCH] Consolidate flush calls for entity tracker packets

Most server packets seem to be sent from here, so try to avoid expensive flush calls from them.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index eae936650fddd5ef418ee2ddd680d36e82045365..06e023994050a07d2efed174b1fbd8f1eddcd231 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -963,7 +963,26 @@ public abstract class MinecraftServer extends com.hpfxd.pandaspigot.tickloop.Ree
                 this.methodProfiler.b();
                 this.methodProfiler.a("tracker");
                 worldserver.timings.tracker.startTiming(); // Spigot
+                // PandaSpigot start - controlled flush for entity tracker packets
+                List<NetworkManager> disabledFlushes = new ArrayList<>(worldserver.players.size());
+                for (EntityHuman player : worldserver.players) {
+                    if (!(player instanceof EntityPlayer)) continue; // skip non-player entities
+                    PlayerConnection connection = ((EntityPlayer) player).playerConnection;
+                    if (connection != null) {
+                        connection.networkManager.disableAutomaticFlush();
+                        disabledFlushes.add(connection.networkManager);
+                    }
+                }
+                try {
+                // PandaSpigot end
                 worldserver.getTracker().updatePlayers();
+                // PandaSpigot start - controlled flush for entity tracker packets
+                } finally {
+                    for (NetworkManager networkManager : disabledFlushes) {
+                        networkManager.enableAutomaticFlush();
+                    }
+                }
+                // PandaSpigot end
                 worldserver.timings.tracker.stopTiming(); // Spigot
                 this.methodProfiler.b();
                 this.methodProfiler.b();