nacos注册中心之服务注册
NacosServiceRegistry的register方法:
public void register(Registration registration) {
if (StringUtils.isEmpty(registration.getServiceId())) {
log.warn("No service to register for nacos client...");
} else {
String serviceId = registration.getServiceId();
String group = this.nacosDiscoveryProperties.getGroup();
Instance instance = this.getNacosInstanceFromRegistration(registration);
try {
this.namingService.registerInstance(serviceId, group, instance);
log.info("nacos registry, {} {} {}:{} register finished", new Object[]{group, serviceId, instance.getIp(), instance.getPort()});
} catch (Exception var6) {
log.error("nacos registry, {} register failed...{},", new Object[]{serviceId, registration.toString(), var6});
ReflectionUtils.rethrowRuntimeException(var6);
}
}
}
方法中调用Nacos Client 的registerInstance完成服务的注册
registerInstance方法:
@Override
public void registerInstance(String serviceName, String groupName, Instance instance) throws NacosException {
if (instance.isEphemeral()) {
BeatInfo beatInfo = new BeatInfo();
beatInfo.setServiceName(NamingUtils.getGroupedName(serviceName, groupName));
beatInfo.setIp(instance.getIp());
beatInfo.setPort(instance.getPort());
beatInfo.setCluster(instance.getClusterName());
beatInfo.setWeight(instance.getWeight());
beatInfo.setMetadata(instance.getMetadata());
beatInfo.setScheduled(false);
long instanceInterval = instance.getInstanceHeartBeatInterval();
beatInfo.setPeriod(instanceInterval == 0 ? DEFAULT_HEART_BEAT_INTERVAL : instanceInterval);
beatReactor.addBeatInfo(NamingUtils.getGroupedName(serviceName, groupName), beatInfo);
}
serverProxy.registerService(NamingUtils.getGroupedName(serviceName, groupName), groupName, instance);
}
- 通过beatReactor.addBeatInfo创建心跳信息实现健康监测,Naocs Server必须确保注册的服务实例是健康的,而心跳检测就是服务健康检测的手段
- serverProxy.registerService实现服务的注册。
addBeatInfo方法:
public void addBeatInfo(String serviceName, BeatInfo beatInfo) {
NAMING_LOGGER.info("[BEAT] adding beat: {} to beat map.", beatInfo);
String key = buildKey(serviceName, beatInfo.getIp(), beatInfo.getPort());
BeatInfo existBeat = null;
//fix #1733
if ((existBeat = dom2Beat.remove(key)) != null) {
existBeat.setStopped(true);
}
dom2Beat.put(key, beatInfo);
executorService.schedule(new BeatTask(beatInfo), beatInfo.getPeriod(), TimeUnit.MILLISECONDS);
MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size());
}
所谓心跳机制就是客户端通过schedule方法定时向服务端发送一个数据包,然后启动一个线程不断检测服务端的回应,如果在设定时间内没有收到服务端的回应,则认为服务器发生故障。Nacos服务端根据客户端的心跳包不断更新服务状态。
接下来就是serverProxy.registerService进行服务的注册,进入方法可以看到其实是一个HTTP协议的POST请求,也就是Nacos提供了Open API来实现服务的注册,SDK进行了封装。