rocketmq源码解析之管理请求获取全部消费者的offset

说在前面

管理请求 GET_ALL_CONSUMER_OFFSET 获取全部消费者的offset

 

源码解析

进入这个方法org.apache.rocketmq.broker.processor.AdminBrokerProcessor#getAllConsumerOffset获取全部消费者的offset

private RemotingCommand getAllConsumerOffset(ChannelHandlerContext ctx, RemotingCommand request) {
        final RemotingCommand response = RemotingCommand.createResponseCommand(null);
//        消费者offset json编码
        String content = this.brokerController.getConsumerOffsetManager().encode();
        if (content != null && content.length() > 0) {
            try {
                response.setBody(content.getBytes(MixAll.DEFAULT_CHARSET));
            } catch (UnsupportedEncodingException e) {
                log.error("get all consumer offset from master error.", e);
                response.setCode(ResponseCode.SYSTEM_ERROR);
                response.setRemark("UnsupportedEncodingException " + e);
                return response;
            }
        } else {
            log.error("No consumer offset in this broker, client: {} ", ctx.channel().remoteAddress());
            response.setCode(ResponseCode.SYSTEM_ERROR);
            response.setRemark("No consumer offset in this broker");
            return response;
        }

        response.setCode(ResponseCode.SUCCESS);
        response.setRemark(null);
        return response;
    }

进入这个方法org.apache.rocketmq.broker.offset.ConsumerOffsetManager#encode(boolean)

public String encode(final boolean prettyFormat) {
    return RemotingSerializable.toJson(this, prettyFormat);
}

消费者offset内存存储位置

//    消费者offset
    private ConcurrentMap<String/* topic@group */, ConcurrentMap<Integer/*queueId*/, Long/*offset*/>> offsetTable =
        new ConcurrentHashMap<String, ConcurrentMap<Integer, Long>>(512);

往上返回到这个方法org.apache.rocketmq.broker.processor.AdminBrokerProcessor#getAllConsumerOffset结束

 

说在最后

本次解析仅表明我的观点，仅供参考。

 

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