From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Bjarne Koll <lynxplay101@gmail.com>
Date: Thu, 9 Dec 2021 01:53:30 +0100
Subject: [PATCH] Optimize Spigot event bus

Original code by lynxplay, licensed under GNU General Public License v3.0
You can find the original code on https://github.com/lynxplay/ktp

diff --git a/src/main/java/org/bukkit/plugin/RegisteredListener.java b/src/main/java/org/bukkit/plugin/RegisteredListener.java
index 419aec56b0e3fa8bcec2ea7f340caa3456b57d00..8530d926931a54ed1300c40cd1e0908b2d9b594d 100644
--- a/src/main/java/org/bukkit/plugin/RegisteredListener.java
+++ b/src/main/java/org/bukkit/plugin/RegisteredListener.java
@@ -62,8 +62,10 @@ public class RegisteredListener {
      * @throws EventException If an event handler throws an exception.
      */
     public void callEvent(@NotNull final Event event) throws EventException {
-        if (event instanceof Cancellable) {
-            if (((Cancellable) event).isCancelled() && isIgnoringCancelled()) {
+        // KTP start - optimize spigot event bus
+        if (isIgnoringCancelled()) {
+            if (event instanceof Cancellable cancellable && cancellable.isCancelled()) {
+        // KTP end - optimize spigot event bus
                 return;
             }
         }
diff --git a/src/main/java/org/bukkit/plugin/SimplePluginManager.java b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
index 6bb115923767c4bd65b18e67eeff5408f2894ab0..b0e11ed48e06abd585bd9dded52945562a8c6830 100644
--- a/src/main/java/org/bukkit/plugin/SimplePluginManager.java
+++ b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
@@ -660,11 +660,15 @@ public final class SimplePluginManager implements PluginManager {
     @Override
     public void callEvent(@NotNull Event event) {
         // Paper - replace callEvent by merging to below method
-        if (event.isAsynchronous() && server.isPrimaryThread()) {
+        // KTP start - optimize spigot event bus
+        final boolean isAsync = event.isAsynchronous();
+        final boolean isPrimary = server.isPrimaryThread(); // Cache to prevent multiple thread object comparisons.
+        if (isAsync && isPrimary) {
             throw new IllegalStateException(event.getEventName() + " may only be triggered asynchronously.");
-        } else if (!event.isAsynchronous() && !server.isPrimaryThread() && !server.isStopping() ) {
+        } else if (!isAsync && !isPrimary && !server.isStopping() ) {
             throw new IllegalStateException(event.getEventName() + " may only be triggered synchronously.");
         }
+        // KTP end - optimize spigot event bus
 
         HandlerList handlers = event.getHandlers();
         RegisteredListener[] listeners = handlers.getRegisteredListeners();