Skip events if there's no listeners

patches/server/0124-Skip-events-if-there-s-no-listeners.patch

@@ -0,0 +1,32 @@
+From 28a031dde622114b5b89e25f0cad11416b91ef7b Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Sat, 4 Apr 2020 03:07:59 -0500
+Subject: [PATCH] Skip events if there's no listeners
+
+---
+ src/main/java/net/minecraft/server/CommandDispatcher.java | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/main/java/net/minecraft/server/CommandDispatcher.java b/src/main/java/net/minecraft/server/CommandDispatcher.java
+index 3b15f953bc..1a2213873a 100644
+--- a/src/main/java/net/minecraft/server/CommandDispatcher.java
++++ b/src/main/java/net/minecraft/server/CommandDispatcher.java
+@@ -256,6 +256,7 @@ public class CommandDispatcher {
+         map.put(this.b.getRoot(), rootcommandnode);
+         this.a(this.b.getRoot(), rootcommandnode, entityplayer.getCommandListener(), (Map) map);
+ 
++        if (PlayerCommandSendEvent.getHandlerList().getRegisteredListeners().length > 0) { // Purpur - skip all this crap if there's nothing listening
+         Collection<String> bukkit = new LinkedHashSet<>();
+         for (CommandNode node : rootcommandnode.getChildren()) {
+             bukkit.add(node.getName());
+@@ -271,6 +272,7 @@ public class CommandDispatcher {
+             }
+         }
+         // CraftBukkit end
++        } // Purpur - skip event
+         entityplayer.playerConnection.sendPacket(new PacketPlayOutCommands(rootcommandnode));
+     }
+ 
+-- 
+2.24.0
+