rocketmq 之namesrv（二十三）mqclient admin请求处理获取消费者的状态

获取消费者的状态AdminBrokerProcessor#getConsumeStats

AdminBrokerProcessor#processRequest#this.getConsumeStats(ctx, request)

private RemotingCommand getConsumeStats(ChannelHandlerContext ctx,
        RemotingCommand request) throws RemotingCommandException {
        final RemotingCommand response = RemotingCommand.createResponseCommand(null);
        final GetConsumeStatsRequestHeader requestHeader =
            (GetConsumeStatsRequestHeader) request.decodeCommandCustomHeader(GetConsumeStatsRequestHeader.class);

        ConsumeStats consumeStats = new ConsumeStats();

        Set<String> topics = new HashSet<String>();
        if (UtilAll.isBlank(requestHeader.getTopic())) {
            /**遍历消费者组、topic缓存信息 获取消费者所在组的topics**/
            topics = this.brokerController.getConsumerOffsetManager().whichTopicByConsumer(requestHeader.getConsumerGroup());
        } else {
            topics.add(requestHeader.getTopic());
        }

        for (String topic : topics) {
            /**获取topic配置**/
            TopicConfig topicConfig = this.brokerController.getTopicConfigManager().selectTopicConfig(topic);
            if (null == topicConfig) {
                log.warn("consumeStats, topic config not exist, {}", topic);
                continue;
            }

            {
                /**按消费组和topic获取订阅数据**/
                SubscriptionData findSubscriptionData =
                    this.brokerController.getConsumerManager().findSubscriptionData(requestHeader.getConsumerGroup(), topic);

                if (null == findSubscriptionData
                    && this.brokerController.getConsumerManager().findSubscriptionDataCount(requestHeader.getConsumerGroup()) > 0) {
                    log.warn("consumeStats, the consumer group[{}], topic[{}] not exist", requestHeader.getConsumerGroup(), topic);
                    continue;
                }
            }
            /**遍历topic写队列**/
            for (int i = 0; i < topicConfig.getReadQueueNums(); i++) {
                MessageQueue mq = new MessageQueue();
                mq.setTopic(topic);
                mq.setBrokerName(this.brokerController.getBrokerConfig().getBrokerName());
                mq.setQueueId(i);

                OffsetWrapper offsetWrapper = new OffsetWrapper();

                long brokerOffset = this.brokerController.getMessageStore().getMaxOffsetInQueue(topic, i);
                if (brokerOffset < 0)
                    brokerOffset = 0;

                long consumerOffset = this.brokerController.getConsumerOffsetManager().queryOffset(
                    requestHeader.getConsumerGroup(),
                    topic,
                    i);
                if (consumerOffset < 0)
                    consumerOffset = 0;

                offsetWrapper.setBrokerOffset(brokerOffset);
                offsetWrapper.setConsumerOffset(consumerOffset);

                long timeOffset = consumerOffset - 1;
                if (timeOffset >= 0) {
                    /**查询最后存储时间**/
                    long lastTimestamp = this.brokerController.getMessageStore().getMessageStoreTimeStamp(topic, i, timeOffset);
                    if (lastTimestamp > 0) {
                        offsetWrapper.setLastTimestamp(lastTimestamp);
                    }
                }

                consumeStats.getOffsetTable().put(mq, offsetWrapper);
            }
            /** 按消费组和topic获取消费者的tps**/
            double consumeTps = this.brokerController.getBrokerStatsManager().tpsGroupGetNums(requestHeader.getConsumerGroup(), topic);

            consumeTps += consumeStats.getConsumeTps();
            consumeStats.setConsumeTps(consumeTps);
        }

        byte[] body = consumeStats.encode();
        response.setBody(body);
        response.setCode(ResponseCode.SUCCESS);
        response.setRemark(null);
        return response;
    }