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本篇内容介绍了"NacosNamingService中deregisterInstance的原理及使用方法"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读，能够学有所成!

序

本文主要研究一下NacosNamingService的deregisterInstance

NacosNamingService

nacos-1.1.3/client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java

public class NacosNamingService implements NamingService { private static final String DEFAULT_PORT = "8080"; private static final long DEFAULT_HEART_BEAT_INTERVAL = TimeUnit.SECONDS.toMillis(5); /** * Each Naming instance should have different namespace. */ private String namespace; private String endpoint; private String serverList; private String cacheDir; private String logName; private HostReactor hostReactor; private BeatReactor beatReactor; private EventDispatcher eventDispatcher; private NamingProxy serverProxy; //...... @Override public void deregisterInstance(String serviceName, String ip, int port) throws NacosException { deregisterInstance(serviceName, ip, port, Constants.DEFAULT_CLUSTER_NAME); } @Override public void deregisterInstance(String serviceName, String groupName, String ip, int port) throws NacosException { deregisterInstance(serviceName, groupName, ip, port, Constants.DEFAULT_CLUSTER_NAME); } @Override public void deregisterInstance(String serviceName, String ip, int port, String clusterName) throws NacosException { deregisterInstance(serviceName, Constants.DEFAULT_GROUP, ip, port, clusterName); } @Override public void deregisterInstance(String serviceName, String groupName, String ip, int port, String clusterName) throws NacosException { Instance instance = new Instance(); instance.setIp(ip); instance.setPort(port); instance.setClusterName(clusterName); deregisterInstance(serviceName, groupName, instance); } @Override public void deregisterInstance(String serviceName, Instance instance) throws NacosException { deregisterInstance(serviceName, Constants.DEFAULT_GROUP, instance); } @Override public void deregisterInstance(String serviceName, String groupName, Instance instance) throws NacosException { if (instance.isEphemeral()) { beatReactor.removeBeatInfo(NamingUtils.getGroupedName(serviceName, groupName), instance.getIp(), instance.getPort()); } serverProxy.deregisterService(NamingUtils.getGroupedName(serviceName, groupName), instance); } //......}

deregisterInstance方法对于ephemeral的instance(默认是ephemeral)会将其BeatInfo从beatReactor中移除，然后通过serverProxy.deregisterService进行服务注销

BeatReactor

nacos-1.1.3/client/src/main/java/com/alibaba/nacos/client/naming/beat/BeatReactor.java

public class BeatReactor { private ScheduledExecutorService executorService; private NamingProxy serverProxy; public final Map dom2Beat = new ConcurrentHashMap(); //...... public void removeBeatInfo(String serviceName, String ip, int port) { NAMING_LOGGER.info("[BEAT] removing beat: {}:{}:{} from beat map.", serviceName, ip, port); BeatInfo beatInfo = dom2Beat.remove(buildKey(serviceName, ip, port)); if (beatInfo == null) { return; } beatInfo.setStopped(true); MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size()); } //...... class BeatTask implements Runnable { BeatInfo beatInfo; public BeatTask(BeatInfo beatInfo) { this.beatInfo = beatInfo; } @Override public void run() { if (beatInfo.isStopped()) { return; } long result = serverProxy.sendBeat(beatInfo); long nextTime = result > 0 ? result : beatInfo.getPeriod(); executorService.schedule(new BeatTask(beatInfo), nextTime, TimeUnit.MILLISECONDS); } } //......}

removeBeatInfo方法则将指定key从dom2Beat移除，标记其stopped为true;BeatTask则会先判断是否为stopped，否的话则通过serverProxy.sendBeat发送心跳信息，计算下一次调度的时间，往executorService添加调度任务

NamingProxy

nacos-1.1.3/client/src/main/java/com/alibaba/nacos/client/naming/net/NamingProxy.java

public class NamingProxy { private static final int DEFAULT_SERVER_PORT = 8848; private int serverPort = DEFAULT_SERVER_PORT; private String namespaceId; private String endpoint; private String nacosDomain; private List serverList; private List serversFromEndpoint = new ArrayList(); private long lastSrvRefTime = 0L; private long vipSrvRefInterMillis = TimeUnit.SECONDS.toMillis(30); private Properties properties; //...... public void deregisterService(String serviceName, Instance instance) throws NacosException { NAMING_LOGGER.info("[DEREGISTER-SERVICE] {} deregistering service {} with instance: {}", namespaceId, serviceName, instance); final Map params = new HashMap(8); params.put(CommonParams.NAMESPACE_ID, namespaceId); params.put(CommonParams.SERVICE_NAME, serviceName); params.put(CommonParams.CLUSTER_NAME, instance.getClusterName()); params.put("ip", instance.getIp()); params.put("port", String.valueOf(instance.getPort())); params.put("ephemeral", String.valueOf(instance.isEphemeral())); reqAPI(UtilAndComs.NACOS_URL_INSTANCE, params, HttpMethod.DELETE); } //......}

NamingProxy的deregisterService方法会往/instance接口发送DELETE请求进行服务注销

小结

NacosNamingService的deregisterInstance方法对于ephemeral的instance(默认是ephemeral)会将其BeatInfo从beatReactor中移除，然后通过serverProxy.deregisterService进行服务注销

"NacosNamingService中deregisterInstance的原理及使用方法"的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注网站，小编将为大家输出更多高质量的实用文章!

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