Initial commit

application/Espo/ORM/EventDispatcher.php

@@ -0,0 +1,79 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\ORM;
+
+use Closure;
+
+/**
+ * Event dispatcher.
+ */
+class EventDispatcher
+{
+    /** @var array{'metadataUpdate': Closure[]} */
+    private array $data;
+
+    private const METADATA_UPDATE = 'metadataUpdate';
+
+    public function __construct()
+    {
+        $this->data = [
+            self::METADATA_UPDATE => [],
+        ];
+    }
+
+    public function subscribeToMetadataUpdate(Closure $callback): void
+    {
+        $this->data[self::METADATA_UPDATE][] = $callback;
+    }
+
+    /**
+     * @internal
+     * @since 8.4.0
+     */
+    public function unsubscribeFromMetadataUpdate(Closure $closure): void
+    {
+        $list = &$this->data[self::METADATA_UPDATE];
+
+        $index = array_search($closure, $list);
+
+        if ($index !== false) {
+            unset($list[$index]);
+
+            $list = array_values($list);
+        }
+    }
+
+    public function dispatchMetadataUpdate(): void
+    {
+        foreach ($this->data[self::METADATA_UPDATE] as $callback) {
+            $callback();
+        }
+    }
+}