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本篇內(nèi)容介紹了“NacosNamingService中deregisterInstance的原理及使用方法”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
本文主要研究一下NacosNamingService的deregisterInstance
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方法對(duì)于ephemeral的instance(默認(rèn)是ephemeral)會(huì)將其BeatInfo從beatReactor中移除,然后通過(guò)serverProxy.deregisterService進(jìn)行服務(wù)注銷(xiāo)
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<String, BeatInfo> dom2Beat = new ConcurrentHashMap<String, BeatInfo>(); //...... 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方法則將指定key從dom2Beat移除,標(biāo)記其stopped為true;BeatTask則會(huì)先判斷是否為stopped,否的話則通過(guò)serverProxy.sendBeat發(fā)送心跳信息,計(jì)算下一次調(diào)度的時(shí)間,往executorService添加調(diào)度任務(wù)
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<String> serverList; private List<String> serversFromEndpoint = new ArrayList<String>(); 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<String, String> params = new HashMap<String, String>(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方法會(huì)往/instance接口發(fā)送DELETE請(qǐng)求進(jìn)行服務(wù)注銷(xiāo)
NacosNamingService的deregisterInstance方法對(duì)于ephemeral的instance(默認(rèn)是ephemeral)會(huì)將其BeatInfo從beatReactor中移除,然后通過(guò)serverProxy.deregisterService進(jìn)行服務(wù)注銷(xiāo)
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