dubbo作者实现简易rpc

首先定义公共的接口

public interface HelloService {
    String hello(String name);
}

服务提供者进行接口的实现部分

public class HelloServieImpl implements HelloService {
    @Override
    public String hello(String name) {
        return "ace";
    }
}

实现rpc，主要为socket通信和协议的商定

public class LfEasyRpc {

    public static void export(final Object service, int port) throws Exception {
        if (service == null) {
            throw new IllegalArgumentException("service instance == null");
        }
        if (port <= 0 || port > 65535) {
            throw new IllegalArgumentException("Invaild port " + port);
        }
        System.out.println("Export service " + service.getClass().getName() + " on port " + port);
        ServerSocket server = new ServerSocket(port);
        for (; ; ) {
            try {
                final Socket socket = server.accept();
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            try {
                                ObjectInputStream input = new ObjectInputStream(socket.getInputStream());
                                try {
                                    String methodName = input.readUTF();
                                    Class<?>[] parameterTypes = (Class<?>[]) input.readObject();
                                    Object[] arguments = (Object[]) input.readObject();
                                    ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());
                                    try {
                                        Method method = service.getClass().getMethod(methodName, parameterTypes);
                                        Object result = method.invoke(service, arguments);
                                        output.writeObject(result);
                                    } catch (Throwable t) {
                                        output.writeObject(t);
                                    } finally {
                                        output.close();
                                    }
                                } finally {
                                    input.close();
                                }
                            } finally {
                                socket.close();
                            }
                        } catch (Exception ex) {
                            ex.printStackTrace();
                        }
                    }
                }).start();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static <T> T refer(final Class<T> interfaceClass, final String host, final int port) throws Exception {
        if (interfaceClass == null) {
            throw new IllegalArgumentException("interfaceClass == null");
        }
        if (!interfaceClass.isInterface()) {
            throw new IllegalArgumentException("The " + interfaceClass.getName() + " must be interface class");
        }
        if (host == null || host.length() == 0) {
            throw new IllegalArgumentException("Host == null");
        }
        if (port <= 0 || port > 65535) {
            throw new IllegalArgumentException("Invalid port " + port);
        }
        System.out.println("Get remote service " + interfaceClass.getName() + " from server " + host + ":" + port);
        return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class<?>[]{interfaceClass}, new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                Socket socket = new Socket(host, port);
                try {
                    ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());
                    try {
                        output.writeUTF(method.getName());
                        output.writeObject(method.getParameterTypes());
                        output.writeObject(args);
                        ObjectInputStream input = new ObjectInputStream(socket.getInputStream());
                        try {
                            Object result = input.readObject();
                            if (result instanceof Throwable) {
                                throw (Throwable) result;
                            }
                            return result;
                        } finally {
                            input.close();
                        }
                    } finally {
                        output.close();
                    }
                } finally {
                    socket.close();
                }
            }
        });
    }
}

服务提供者暴露需要调用的方法实现

public class RpcProvider {
    public static void main(String[] args) throws Exception {
        HelloService service = new HelloServieImpl();
        LfEasyRpc.export(service, 1234);
    }
}

服务消费者调用rpc

public class RpcConsumer {
    public static void main(String[] args) throws Exception {
        HelloService service = LfEasyRpc.refer(HelloService.class, "127.0.0.1", 1234);
        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            String hello = service.hello(" come on " + i);
            System.out.println(hello);
            Thread.sleep(1000);
        }
    }

}