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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！
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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
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
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
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创新互联网站，小编将为大家输出更多高质量的实用文章！