TYPO3 v15 dev-main snapshot ()

Classes/EventDispatcher/EventDispatcher.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+namespace TYPO3\CMS\Core\EventDispatcher;
+
+use Psr\EventDispatcher\EventDispatcherInterface;
+use Psr\EventDispatcher\ListenerProviderInterface;
+use Psr\EventDispatcher\StoppableEventInterface;
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+use TYPO3\CMS\Core\SingletonInterface;
+
+/**
+ * Base PSR-14 event dispatcher which has only one listener provider, given at runtime
+ * Is a singleton instance in order to be published once.
+ */
+#[AsAlias(EventDispatcherInterface::class, public: true)]
+class EventDispatcher implements EventDispatcherInterface, SingletonInterface
+{
+    public function __construct(
+        protected readonly ListenerProviderInterface $listenerProvider
+    ) {}
+
+    /**
+     * @template T of object
+     * @param T $event
+     * @return T
+     */
+    public function dispatch(object $event): object
+    {
+        // If the event is already stopped, nothing to do here.
+        if ($event instanceof StoppableEventInterface && $event->isPropagationStopped()) {
+            return $event;
+        }
+        foreach ($this->listenerProvider->getListenersForEvent($event) as $listener) {
+            $listener($event);
+            if ($event instanceof StoppableEventInterface && $event->isPropagationStopped()) {
+                break;
+            }
+        }
+        return $event;
+    }
+}