rocketmq源碼解析之管理請求獲取延遲的offset

時間 2019-11-11

標籤 rocketmq 源碼解析管理請求獲取延遲 offset 简体版

原文原文鏈接

說在前面apache

管理請求 GET_ALL_DELAY_OFFSET 延遲的offset緩存

源碼解析微信

進入這個方法org.apache.rocketmq.broker.processor.AdminBrokerProcessor#getAllDelayOffset獲取延遲的offsetapp

private RemotingCommand getAllDelayOffset(ChannelHandlerContext ctx, RemotingCommand request) {
        final RemotingCommand response = RemotingCommand.createResponseCommand(null);
//        消息編碼=》
        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;
    }

進入這個方法org.apache.rocketmq.store.schedule.ScheduleMessageService#encode(boolean) 消息編碼this

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

延遲消息offset內存存儲位置編碼

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

往上返回到這個方法org.apache.rocketmq.broker.processor.AdminBrokerProcessor#getAllDelayOffset結束code

說在最後orm

本次解析僅表明我的觀點，僅供參考。blog

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