docs: def onMessageReceived(self, method_frame, properties, body):
          """
          Callback which is called every time when message is received.
  
          Warning:
              You SHOULD override this.
  
          Note:
              It is expected, that method returns True, if you want to
              automatically ack the received message, which can be important in
              some situations, because otherwise the message will be held in
              message queue until someone will ack it.
  
              You don't have to return True/False - you can ack the message
              yourself, by calling :func:`ack`.
  
          Note:
              Good design choice is to ack the message AFTER you process it, to
              be sure, that message is processed properly and can be removed from
              queue.
          """
          print "method_frame:", method_frame
          print "properties:", properties
          print "body:", body
  
          print "---"
          print