code: public PurgeQueueResult purgeQueue(PurgeQueueRequest purgeQueueRequest)
  			throws AmazonServiceException, AmazonClientException {
  		LOG.warn("Calling purgeQueue deletes SQS messages without deleting their payload from S3.");
  
  		if (purgeQueueRequest == null) {
  			String errorMessage = "purgeQueueRequest cannot be null.";
  			LOG.error(errorMessage);
  			throw new AmazonClientException(errorMessage);
  		}
  
  		purgeQueueRequest.getRequestClientOptions().appendUserAgent(SQSExtendedClientConstants.USER_AGENT_HEADER);
  
  		return super.purgeQueue(purgeQueueRequest);
  	}
docs: <p>
  Deletes the messages in a queue specified by the <b>queue URL</b> .
  </p>
  <p>
  <b>IMPORTANT:</b>When you use the PurgeQueue API, the deleted messages in
  the queue cannot be retrieved.
  </p>
  <p>
  <b>IMPORTANT:</b> This does not delete the message payloads from Amazon S3.
  </p>
  <p>
  When you purge a queue, the message deletion process takes up to 60
  seconds. All messages sent to the queue before calling
  <code>PurgeQueue</code> will be deleted; messages sent to the queue while
  it is being purged may be deleted. While the queue is being purged,
  messages sent to the queue before <code>PurgeQueue</code> was called may
  be received, but will be deleted within the next minute.
  </p>
  
  @param purgeQueueRequest
  Container for the necessary parameters to execute the
  PurgeQueue service method on AmazonSQS.
  @return The response from the PurgeQueue service method, as returned
  by AmazonSQS.
  
  @throws AmazonClientException
  If any internal errors are encountered inside the client
  while attempting to make the request or handle the response.
  For example if a network connection is not available.
  @throws AmazonServiceException
  If an error response is returned by AmazonSQS indicating
  either a problem with the data in the request, or a server
  side issue.