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本文主要研究一下NacosNamingService的registerInstance
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);
//......
@Override
public void registerInstance(String serviceName, String ip, int port) throws NacosException {
registerInstance(serviceName, ip, port, Constants.DEFAULT_CLUSTER_NAME);
}
@Override
public void registerInstance(String serviceName, String groupName, String ip, int port) throws NacosException {
registerInstance(serviceName, groupName, ip, port, Constants.DEFAULT_CLUSTER_NAME);
}
@Override
public void registerInstance(String serviceName, String ip, int port, String clusterName) throws NacosException {
registerInstance(serviceName, Constants.DEFAULT_GROUP, ip, port, clusterName);
}
@Override
public void registerInstance(String serviceName, String groupName, String ip, int port, String clusterName) throws NacosException {
Instance instance = new Instance();
instance.setIp(ip);
instance.setPort(port);
instance.setWeight(1.0);
instance.setClusterName(clusterName);
registerInstance(serviceName, groupName, instance);
}
@Override
public void registerInstance(String serviceName, Instance instance) throws NacosException {
registerInstance(serviceName, Constants.DEFAULT_GROUP, instance);
}
@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);
}
//......
}- registerInstance方法对于ephemeral的instance(
默认是ephemeral)会创建BeatInfo，通过beatReactor.addBeatInfo方法添加到调度任务中，然后通过serverProxy.registerService进行服务注册
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<String, BeatInfo> dom2Beat = new ConcurrentHashMap<String, BeatInfo>();
public BeatReactor(NamingProxy serverProxy) {
this(serverProxy, UtilAndComs.DEFAULT_CLIENT_BEAT_THREAD_COUNT);
}
public BeatReactor(NamingProxy serverProxy, int threadCount) {
this.serverProxy = serverProxy;
executorService = new ScheduledThreadPoolExecutor(threadCount, new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setDaemon(true);
thread.setName("com.alibaba.nacos.naming.beat.sender");
return thread;
}
});
}
public void addBeatInfo(String serviceName, BeatInfo beatInfo) {
NAMING_LOGGER.info("[BEAT] adding beat: {} to beat map.", beatInfo);
dom2Beat.put(buildKey(serviceName, beatInfo.getIp(), beatInfo.getPort()), beatInfo);
executorService.schedule(new BeatTask(beatInfo), beatInfo.getPeriod(), TimeUnit.MILLISECONDS);
MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size());
}
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());
}
private String buildKey(String serviceName, String ip, int port) {
return serviceName + Constants.NAMING_INSTANCE_ID_SPLITTER
+ ip + Constants.NAMING_INSTANCE_ID_SPLITTER + port;
}
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);
}
}
}- BeatReactor的addBeatInfo方法会往dom2Beat添加信息，然后调度BeatTask；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<String> serverList;
private List<String> serversFromEndpoint = new ArrayList<String>();
private long lastSrvRefTime = 0L;
private long vipSrvRefInterMillis = TimeUnit.SECONDS.toMillis(30);
private Properties properties;
//......
public long sendBeat(BeatInfo beatInfo) {
try {
if (NAMING_LOGGER.isDebugEnabled()) {
NAMING_LOGGER.debug("[BEAT] {} sending beat to server: {}", namespaceId, beatInfo.toString());
}
Map<String, String> params = new HashMap<String, String>(4);
params.put("beat", JSON.toJSONString(beatInfo));
params.put(CommonParams.NAMESPACE_ID, namespaceId);
params.put(CommonParams.SERVICE_NAME, beatInfo.getServiceName());
String result = reqAPI(UtilAndComs.NACOS_URL_BASE + "/instance/beat", params, HttpMethod.PUT);
JSONObject jsonObject = JSON.parseObject(result);
if (jsonObject != null) {
return jsonObject.getLong("clientBeatInterval");
}
} catch (Exception e) {
NAMING_LOGGER.error("[CLIENT-BEAT] failed to send beat: " + JSON.toJSONString(beatInfo), e);
}
return 0L;
}
public void registerService(String serviceName, String groupName, Instance instance) throws NacosException {
NAMING_LOGGER.info("[REGISTER-SERVICE] {} registering service {} with instance: {}",
namespaceId, serviceName, instance);
final Map<String, String> params = new HashMap<String, String>(9);
params.put(CommonParams.NAMESPACE_ID, namespaceId);
params.put(CommonParams.SERVICE_NAME, serviceName);
params.put(CommonParams.GROUP_NAME, groupName);
params.put(CommonParams.CLUSTER_NAME, instance.getClusterName());
params.put("ip", instance.getIp());
params.put("port", String.valueOf(instance.getPort()));
params.put("weight", String.valueOf(instance.getWeight()));
params.put("enable", String.valueOf(instance.isEnabled()));
params.put("healthy", String.valueOf(instance.isHealthy()));
params.put("ephemeral", String.valueOf(instance.isEphemeral()));
params.put("metadata", JSON.toJSONString(instance.getMetadata()));
reqAPI(UtilAndComs.NACOS_URL_INSTANCE, params, HttpMethod.POST);
}
//......
}- NamingProxy的sendBeat方法会往/instance/beat接口发送PUT请求；registerService方法会往/instance接口发送POST请求进行服务注册
小结
NacosNamingService的registerInstance方法对于ephemeral的instance(默认是ephemeral)会创建BeatInfo，通过beatReactor.addBeatInfo方法添加到调度任务中，然后通过serverProxy.registerService进行服务注册