pingConnection example

/** * Checks whether the connection is still open or reconnects otherwise. * * @author Fuong <insidestyles@gmail.com> */
class DoctrinePingConnectionMiddleware extends AbstractDoctrineMiddleware
{
    protected function handleForManager(EntityManagerInterface $entityManager, Envelope $envelope, StackInterface $stack): Envelope
    {
        if (null !== $envelope->last(ConsumedByWorkerStamp::class)) {
            $this->pingConnection($entityManager);
        }

        return $stack->next()->handle($envelope, $stack);
    }

    private function pingConnection(EntityManagerInterface $entityManager): void
    {
        $connection = $entityManager->getConnection();

        try {
            $connection->executeQuery($connection->getDatabasePlatform()->getDummySelectSQL());
        }