rocketmq源码解析默认请求处理器③

说在前面

默认请求处理器，取消broker注册

 

源码解析

进入这个方法，org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#unregisterBroker

  public RemotingCommand unregisterBroker(ChannelHandlerContext ctx,        RemotingCommand request) throws RemotingCommandException {        final RemotingCommand response = RemotingCommand.createResponseCommand(null);        final UnRegisterBrokerRequestHeader requestHeader =            (UnRegisterBrokerRequestHeader) request.decodeCommandCustomHeader(UnRegisterBrokerRequestHeader.class);
//        =》        this.namesrvController.getRouteInfoManager().unregisterBroker(            requestHeader.getClusterName(),            requestHeader.getBrokerAddr(),            requestHeader.getBrokerName(),            requestHeader.getBrokerId());
        response.setCode(ResponseCode.SUCCESS);        response.setRemark(null);        return response;    }

进入这个方法，org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#unregisterBroker

  public void unregisterBroker(        final String clusterName,        final String brokerAddr,        final String brokerName,        final long brokerId) {        try {            try {                this.lock.writeLock().lockInterruptibly();//                删除存活的broker信息                BrokerLiveInfo brokerLiveInfo = this.brokerLiveTable.remove(brokerAddr);                log.info("unregisterBroker, remove from brokerLiveTable {}, {}",                    brokerLiveInfo != null ? "OK" : "Failed",                    brokerAddr                );
//                删除过滤的broker列表                this.filterServerTable.remove(brokerAddr);
                boolean removeBrokerName = false;//                获取broker数据                BrokerData brokerData = this.brokerAddrTable.get(brokerName);                if (null != brokerData) {//                    从broker数据中删除broker                    String addr = brokerData.getBrokerAddrs().remove(brokerId);                    log.info("unregisterBroker, remove addr from brokerAddrTable {}, {}",                        addr != null ? "OK" : "Failed",                        brokerAddr                    );
                    if (brokerData.getBrokerAddrs().isEmpty()) {//                        删除broker数据                        this.brokerAddrTable.remove(brokerName);                        log.info("unregisterBroker, remove name from brokerAddrTable OK, {}",                            brokerName                        );
                        removeBrokerName = true;                    }                }
                if (removeBrokerName) {//                    获取broker集群                    Set nameSet = this.clusterAddrTable.get(clusterName);                    if (nameSet != null) {                        boolean removed = nameSet.remove(brokerName);                        log.info("unregisterBroker, remove name from clusterAddrTable {}, {}",                            removed ? "OK" : "Failed",                            brokerName);
                        if (nameSet.isEmpty()) {                            this.clusterAddrTable.remove(clusterName);                            log.info("unregisterBroker, remove cluster from clusterAddrTable {}",                                clusterName                            );                        }                    }//                    删除broker的topic=》                    this.removeTopicByBrokerName(brokerName);                }            } finally {                this.lock.writeLock().unlock();            }        } catch (Exception e) {            log.error("unregisterBroker Exception", e);        }    }

进入这个方法，删除broker的topic，org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#removeTopicByBrokerName

  private void removeTopicByBrokerName(final String brokerName) {        Iterator>> itMap = this.topicQueueTable.entrySet().iterator();        while (itMap.hasNext()) {            Entry> entry = itMap.next();
            String topic = entry.getKey();            List queueDataList = entry.getValue();            Iterator it = queueDataList.iterator();            while (it.hasNext()) {                QueueData qd = it.next();//                获取broker的消息队列并删除                if (qd.getBrokerName().equals(brokerName)) {                    log.info("removeTopicByBrokerName, remove one broker's topic {} {}", topic, qd);                    it.remove();                }            }
//            如果topic的消息队列为空，删除topic的消息队列            if (queueDataList.isEmpty()) {                log.info("removeTopicByBrokerName, remove the topic all queue {}", topic);                itMap.remove();            }        }    }

返回到这个方法，org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#unregisterBroker结束。

 

说在最后

本次解析仅代表个人观点，仅供参考。

 

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转载于:https://my.oschina.net/u/3775437/blog/3095524