Skip event if no listeners

patches/api/0013-Skip-event-if-no-listeners.patch

@@ -0,0 +1,35 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: DenaryDev <[email protected]>
+Date: Mon, 6 Jun 2022 00:15:47 +0500
+Subject: [PATCH] Skip event if no listeners
+
+Ported from JettPack
+
+diff --git a/src/main/java/org/bukkit/plugin/SimplePluginManager.java b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
+index bab8bb3a52cdeef5f7052d4e3f404c42f37d117d..f1eba4a691437e8f3cdc342cbcfea4c93a26f94f 100644
+--- a/src/main/java/org/bukkit/plugin/SimplePluginManager.java
++++ b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
+@@ -650,6 +650,12 @@ public final class SimplePluginManager implements PluginManager {
+      */
+     @Override
+     public void callEvent(@NotNull Event event) {
++        // Sapphire start
++        HandlerList handlers = event.getHandlers();
++        RegisteredListener[] listeners = handlers.getRegisteredListeners();
++        if (listeners.length == 0) return;
++        // Sapphire end
++
+         // Paper - replace callEvent by merging to below method
+         if (event.isAsynchronous() && server.isPrimaryThread()) {
+             throw new IllegalStateException(event.getEventName() + " may only be triggered asynchronously.");
+@@ -657,8 +663,8 @@ public final class SimplePluginManager implements PluginManager {
+             throw new IllegalStateException(event.getEventName() + " may only be triggered synchronously.");
+         }
+
+-        HandlerList handlers = event.getHandlers();
+-        RegisteredListener[] listeners = handlers.getRegisteredListeners();
++       // HandlerList handlers = event.getHandlers(); // Sapphire
++       // RegisteredListener[] listeners = handlers.getRegisteredListeners(); // Sapphire
+
+         for (RegisteredListener registration : listeners) {
+             if (!registration.getPlugin().isEnabled()) {