[QUEUE] Add queueing wrapper, default configuration and example usage

src/Core/Queue/Queue.php

@@ -0,0 +1,58 @@
+<?php
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social 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.
+//
+// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+
+/**
+ * Queue wrapper
+ *
+ * @package  GNUsocial
+ * @category Wrapper
+ *
+ * @author    Hugo Sales <hugo@fc.up.pt>
+ * @copyright 2020 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace App\Core\Queue;
+
+use Symfony\Component\Messenger\MessageBusInterface;
+
+abstract class Queue
+{
+    private static ?MessageBusInterface $message_bus;
+
+    public static function setMessageBus($mb): void
+    {
+        self::$message_bus = $mb;
+    }
+
+    /**
+     * Enqueue a $message in a configured trasnport, to be handled by the $queue handler
+     *
+     * @param object|string
+     * @param mixed $message
+     */
+    public static function enqueue($message, string $queue, bool $high = false, array $stamps = [])
+    {
+        if ($high) {
+            self::$message_bus->dispatch(new MessageHigh($message, $queue), $stamps);
+        } else {
+            self::$message_bus->dispatch(new MessageLow($message, $queue), $stamps);
+        }
+    }
+}