如何从'py-kafka消费者'获取最后一条消息？

Question

我使用这个配置：

def __init__(self):
    self.client = KafkaClient(hosts='localhost:9092')
    self.topic = None
    self.consumer = None
    self.producer = None



def initialize_variables(self, topic_name):
    if ((self.topic == None) or (self.topic != topic_name)):
        self.topic = self.client.topics[topic_name]
        self.consumer = self.topic.get_simple_consumer(
                        auto_offset_reset=OffsetType.LATEST,
                        reset_offset_on_start=False
        )
        self.producer = self.topic.get_producer()

还有：

@keyword('Kafka Consume')
    def consume_1(self, topic_name, timeout = DEFAULT_TIMEOUT):
        self.initialize_variables(topic_name)
        loop_time = time.time() + timeout
        while time.time() <= loop_time:
              msg_tuple = self.consumer.consume(block = False)
              if msg_tuple is None:
                  continue
              received_msg = json.loads(msg_tuple.value)
              return received_msg
        return None

每次我使用这个设置时，我总是得到最后的结果，而不是当前的结果。