rocketmq源码解析之管理请求获取延迟的offset

时间 2019-11-11

标签 rocketmq 源码解析管理请求获取延迟 offset 繁體版

原文原文链接

说在前面apache

管理请求 GET_ALL_DELAY_OFFSET 延迟的offset缓存

源码解析微信

进入这个方法org.apache.rocketmq.broker.processor.AdminBrokerProcessor#getAllDelayOffset获取延迟的offsetapp

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

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

进入这个方法org.apache.rocketmq.store.schedule.ScheduleMessageService#encode(boolean) 消息编码this

public String encode(final boolean prettyFormat) {
    DelayOffsetSerializeWrapper delayOffsetSerializeWrapper = new DelayOffsetSerializeWrapper();
    delayOffsetSerializeWrapper.setOffsetTable(this.offsetTable);
    return delayOffsetSerializeWrapper.toJson(prettyFormat);
}

延迟消息offset内存存储位置编码

//    delay的offset缓存
    private final ConcurrentMap<Integer /* level */, Long/* offset */> offsetTable =
        new ConcurrentHashMap<Integer, Long>(32);

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

说在最后orm

本次解析仅表明我的观点，仅供参考。blog

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