code: @Override
      public ListDeadLetterSourceQueuesResult listDeadLetterSourceQueues(ListDeadLetterSourceQueuesRequest request) {
          request = beforeClientExecution(request);
          return executeListDeadLetterSourceQueues(request);
      }
docs: <p>
  Returns a list of your queues that have the <code>RedrivePolicy</code> queue attribute configured with a
  dead-letter queue.
  </p>
  <p>
  For more information about using dead-letter queues, see <a
  href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-dead-letter-queues.html"
  >Using Amazon SQS Dead-Letter Queues</a> in the <i>Amazon Simple Queue Service Developer Guide</i>.
  </p>
  
  @param listDeadLetterSourceQueuesRequest
  @return Result of the ListDeadLetterSourceQueues operation returned by the service.
  @throws QueueDoesNotExistException
  The specified queue doesn't exist.
  @sample AmazonSQS.ListDeadLetterSourceQueues
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/sqs-2012-11-05/ListDeadLetterSourceQueues" target="_top">AWS
  API Documentation</a>