Nacos源码处理心跳请求

查看Serviceservice.processClientBeat(clientBeat);方法:

public void processClientBeat(final RsInfo rsInfo) {
    ClientBeatProcessor clientBeatProcessor = new ClientBeatProcessor();
    clientBeatProcessor.setService(this);
    clientBeatProcessor.setRsInfo(rsInfo);
    HealthCheckReactor.scheduleNow(clientBeatProcessor);
}

可以看到心跳信息被封装到了 ClientBeatProcessor类中,交给了HealthCheckReactor处理,HealthCheckReactor就是对线程池的封装,不用过多查看。

关键的业务逻辑都在ClientBeatProcessor这个类中,它是一个Runnable,其中的run方法如下:

@Override
public void run() {
    Service service = this.service;
    if (Loggers.EVT_LOG.isDebugEnabled()) {
        Loggers.EVT_LOG.debug("[CLIENT-BEAT] processing beat: {}", rsInfo.toString());
    }

    String ip = rsInfo.getIp();
    String clusterName = rsInfo.getCluster();
    int port = rsInfo.getPort();
    // 获取集群信息
    Cluster cluster = service.getClusterMap().get(clusterName);
    // 获取集群中的所有实例信息
    List<Instance> instances = cluster.allIPs(true);

    for (Instance instance : instances) {
        // 找到心跳的这个实例
        if (instance.getIp().equals(ip) && instance.getPort() == port) {
            if (Loggers.EVT_LOG.isDebugEnabled()) {
                Loggers.EVT_LOG.debug("[CLIENT-BEAT] refresh beat: {}", rsInfo.toString());
            }
            // 更新实例的最后一次心跳时间 lastBeat
            instance.setLastBeat(System.currentTimeMillis());
            if (!instance.isMarked()) {
                if (!instance.isHealthy()) {
                    instance.setHealthy(true);
                    Loggers.EVT_LOG
                        .info("service: {} {POS} {IP-ENABLED} valid: {}:{}@{}, region: {}, msg: client beat ok",
                              cluster.getService().getName(), ip, port, cluster.getName(),
                              UtilsAndCommons.LOCALHOST_SITE);
                    getPushService().serviceChanged(service);
                }
            }
        }
    }
}

处理心跳请求的核心就是更新心跳实例的最后一次心跳时间,lastBeat,这个会成为判断实例心跳是否过期的关键指标!

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