/**
  * For each store with a unique AMQP configuration, consume messages from
  * each configured queue.
  * @return self
  */
 public function processQueues()
 {
     // consume queues for each store with a unique set of AMQP configuration
     foreach ($this->_amqpConfigHelper->getQueueConfigurationScopes() as $store) {
         $this->_consumeStoreQueues($store);
     }
     return $this;
 }