Nacos服务注册源码：客户端

入口

我们就拿nacos自己example下的NamingExample来做测试

public class NamingExample {

    public static void main(String[] args) throws NacosException, InterruptedException {

        Properties properties = new Properties();
        properties.setProperty("serverAddr", "localhost");
        properties.setProperty("namespace", "public");

        NamingService naming = NamingFactory.createNamingService(properties);

        naming.registerInstance("nacos.test.3", "11.11.11.11", 8888, "TEST1");

        System.out.println("instances after register: " + naming.getAllInstances("nacos.test.3"));

        Executor executor = new ThreadPoolExecutor( 1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(),
                                                   new ThreadFactory() {
                                                       @Override
                                                       public Thread newThread(Runnable r) {
                                                           Thread thread = new Thread(r);
                                                           thread.setName("test-thread");
                                                           return thread;
                                                       }
                                                   });

        naming.subscribe("nacos.test.3", new AbstractEventListener() {

            //EventListener onEvent is sync to handle, If process too low in onEvent, maybe block other onEvent callback.
            //So you can override getExecutor() to async handle event.
            @Override
            public Executor getExecutor() {
                return executor;
            }

            @Override
            public void onEvent(Event event) {
                System.out.println("serviceName: " + ((NamingEvent) event).getServiceName());
                System.out.println("instances from event: " + ((NamingEvent) event).getInstances());
            }
        });

        naming.deregisterInstance("nacos.test.3", "11.11.11.11", 8888, "TEST1");

        Thread.sleep(1000);

        System.out.println("instances after deregister: " + naming.getAllInstances("nacos.test.3"));

        Thread.sleep(1000);
    }
}

NamingFactory.createNamingService

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将配置参数properties传进去，然后通过反射创建NamingService， 也就是说会调用到NacosNamingService的构造方法，我们来看一下

这里会调用到NamingClientProxyDelegate的构造方法

这里我们提前注意一下NamingGrpcClientProxy的构造方法，后面会用到

！！！有一个start方法，它会创建连接

connectToServer会调用到子类GrpcClient.connectToServer方法

naming.registerInstance

这里的namingServer是NacosNamingServer，最终会调用到NacosNamingServer.registerInstance(serviceName, ip, port, clusterName)


如果说group不传入的话，默认会设置一个DEFAULT_GROUP，继续调用

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在构造方法里面我们能看到clientProxy实际上是一个NamingClientProxyDelegate，这里会调用它的registerService

NamingClientProxyDelegate.registerService

一般来说我们实例都是临时实例，所以这里使用的grpcClientProxy
接下来会调用到NamingGrpcClientProxy.registerService(serviceName, groupName, instance)

NamingGrpcClientProxy.registerService

1. 又封装了一个InstanceRequest对象，里面包含namespaceId, serverName, groupName, instance等
2. 调用requestToServer：向服务端发起请求了

这里的rpcClint是GrpcSdkClient，所以会调用到它的request方法

GrpcSdkClient.request

这里会调用到父类RpcClient.request方法


这里最终会调用到GrpcConnection里面的request方法

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