编写一个 rpc

手动编写一个 RPC 调用

package com.alibaba.study.rpc.framework;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Created by baizhuang on 2019-04-03.
 */
public class RpcFramework {

    /**
     * 暴露服务
     * service : 服务实现
     * port: 服务端口
     */
    public static  void export(final Object service,int port)throws  Exception{
        if(service == null){
            throw  new IllegalArgumentException("service == null");
        }
        if(port<=0||port>65535){
            throw new IllegalArgumentException("port invalid:"+port);
        }
        System.out.println("Export service:"+service.getClass().getName()+" on port :"+port );
        ServerSocket server= new ServerSocket(port);
        while(true){
            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 e){
                            e.printStackTrace();
                        }
                    }
                }).start();
            }catch (Exception e){
                e.printStackTrace();
            }
        }

    }


    /**
     * 引用服务
     */

    public static <T> T refer(final Class<T> interfaceClass,final String host,final  int port)throws  Exception{
        if(interfaceClass == null){
            throw new IllegalArgumentException("interface class == null");
        }
        if(!interfaceClass.isInterface()){
            throw new IllegalArgumentException("The" + interfaceClass.getClass().getName()+"must be interface");
        }
        if(host == null|| host.length()==0){
            throw  new IllegalArgumentException("host == null");
        }
        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();
                }
            }
        });
    }
}

接口以及实现

package com.alibaba.study.rpc.test;

/**
 * Created by baizhuang on 2019-04-03.
 */
public interface HelloService {
    String hello(String name);
}

package com.alibaba.study.rpc.test;

/**
 * Created by baizhuang on 2019-04-03.
 */
public class HelloServiceImpl implements HelloService{
    @Override
    public String hello(String name) {
        return "Hello"+name;
    }
}

服务提供方

package com.alibaba.study.rpc.test;

import com.alibaba.study.rpc.framework.RpcFramework;

/**
 * Created by baizhuang on 2019-04-03.
 */
public class RpcProvider {
    public static void main(String[] args) throws Exception{
        HelloService service = new HelloServiceImpl();
        RpcFramework.export(service,1234);
    }
}

服务客户端

package com.alibaba.study.rpc.test;

import com.alibaba.study.rpc.framework.RpcFramework;

/**
 * Created by baizhuang on 2019-04-03.
 */
public class RpcConsumer {
    public static void main(String[] args) throws Exception{
        HelloService service = RpcFramework.refer(HelloService.class,"127.0.0.1",1234);
        for(int i=0;i<Integer.MAX_VALUE;i++){
            String hello = service.hello("World : "+i);
            System.out.println(hello);
            Thread.sleep(1000);
        }
    }
}