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backend/vendor/symfony/doctrine-bridge/Messenger/DoctrineCloseConnectionMiddleware.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\Doctrine\Messenger;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Middleware\StackInterface;
+use Symfony\Component\Messenger\Stamp\ConsumedByWorkerStamp;
+
+/**
+ * Closes connection and therefore saves number of connections.
+ *
+ * @author Fuong <insidestyles@gmail.com>
+ */
+class DoctrineCloseConnectionMiddleware extends AbstractDoctrineMiddleware
+{
+    protected function handleForManager(EntityManagerInterface $entityManager, Envelope $envelope, StackInterface $stack): Envelope
+    {
+        try {
+            $connection = $entityManager->getConnection();
+
+            return $stack->next()->handle($envelope, $stack);
+        } finally {
+            if (null !== $envelope->last(ConsumedByWorkerStamp::class)) {
+                $connection->close();
+            }
+        }
+    }
+}