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

This patch contains a lot of small optimizations to the spigot event bus
to improve its speed as much as possible, allowing for a large amount of
events to be published by the server without impacting the overall
performance too much.

diff --git a/src/main/java/org/bukkit/event/Event.java b/src/main/java/org/bukkit/event/Event.java
index 8ec56cd6b8e0f5c5dd8c7c88b4671e18dcf109d0..caae79275802bc5e5a5385d6a11903dfa84325d1 100644
--- a/src/main/java/org/bukkit/event/Event.java
+++ b/src/main/java/org/bukkit/event/Event.java
@@ -14,7 +14,7 @@ import org.jetbrains.annotations.NotNull;
  */
 public abstract class Event {
     private String name;
-    private final boolean async;
+    private final net.kyori.adventure.util.TriState async; // KTP - optimize spigot event bus
 
     /**
      * The default constructor is defined for cleaner code. This constructor
@@ -32,9 +32,35 @@ public abstract class Event {
      *     by default from default constructor
      */
     public Event(boolean isAsync) {
+        // KTP start - optimize spigot event bus
+        this(net.kyori.adventure.util.TriState.byBoolean(isAsync));
+    }
+
+    /**
+     * This constructor is used to explicitly declare an event as synchronous
+     * or asynchronous or potentially unset.
+     *
+     * @param isAsync true indicates the event will fire asynchronously, false
+     *                by default from default constructor, unset indicates that the event may be called on either the server thread or off the server
+     *                thread.
+     */
+    public Event(@NotNull final net.kyori.adventure.util.TriState isAsync) {
         this.async = isAsync;
     }
 
+    /**
+     * Returns a tristate that, when resolving to true or false, has the exact indications defined by {@link #isAsynchronous()}.
+     * <p>
+     * If the tristate resolves to NOT_SET, the event may or may not have been fired off the main thread, meaning a plugin would have
+     * to validate what thread the spigot event bus was called on.
+     *
+     * @return the tristate enum.
+     */
+    public final @NotNull net.kyori.adventure.util.TriState asynchronous() {
+        return this.async;
+    }
+    // KTP end - optimize spigot event bus
+
     // Paper start
     /**
      * Calls the event and tests if cancelled.
@@ -92,7 +118,7 @@ public abstract class Event {
      * @return false by default, true if the event fires asynchronously
      */
     public final boolean isAsynchronous() {
-        return async;
+        return this.async == net.kyori.adventure.util.TriState.TRUE; // KTP - optimize spigot event bus
     }
 
     public enum Result {
diff --git a/src/main/java/org/bukkit/plugin/RegisteredListener.java b/src/main/java/org/bukkit/plugin/RegisteredListener.java
index 3b3d9642a8d63798dc28f2f8df77f0466451cbff..2dad4a19f4ec6f7463d749465189acfb206e58e3 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/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
index 7572a0bf6614b02be3cbccc7b86e52ee1b8df621..1010ed0063c5f92f9fe5e370a8624e01f06773f9 100644
--- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
@@ -309,4 +309,11 @@ public final class PluginClassLoader extends URLClassLoader implements io.paperm
     }
 
     // Paper end
+
+    // KTP start - expose addURL
+    @Override
+    public void addURL(final URL url) {
+        super.addURL(url);
+    }
+    // KTP end - expose addURL
 }