/**
  * Flush all memory queues.
  *
  * @return void
  */
 protected function flushMemoryQueues()
 {
     $queues = $this->queueManager->getQueues();
     foreach ($queues as $queue) {
         if ($queue instanceof \R3H6\Jobqueue\Queue\MemoryQueue) {
             $this->worker->work($queue->getName(), 0, Worker::LIMIT_QUEUE);
         }
     }
 }