手写RPC

服务端代码

package com.peiyu.rpcs.bios;

import java.io.IOException;

public interface IRpcServers {

    void start() throws IOException;

    /**

     * 服务注册

     * @param serviceInterface 服务接口

     * @param impl 服务实现类

     */

    void register(Class serviceInterface, Class impl);

}

实现类

package com.peiyu.rpcs.bios;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.lang.reflect.Method;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.HashMap;

import java.util.concurrent.ArrayBlockingQueue;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

public class RpcServesrImpl implements IRpcServers {

    private int port;

    public static final HashMap<String, Class> serviceRegistry = new HashMap<String, Class>();

    private static final ThreadPoolExecutor executor = new ThreadPoolExecutor(20, 20, 100, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(100));

    public RpcServesrImpl(int port) {

        this.port = port;

    }

    /**

     * 启动服务

     */

    @Override

    public void start() throws IOException {

        ServerSocket server = new ServerSocket();

        server.bind(new InetSocketAddress(port));

        System.out.println("Bio rpc 服务启动开始###端口###" + port);

        try {

            while (true) {

                System.out.println("等待客户端接入");

                executor.execute(new ServersTask(server.accept()));

            }

        } catch (Exception e) {

            if (server != null) {

                server.close();

            }

        }

    }

    @Override

    public void register(Class serviceInterface, Class impl) {

        serviceRegistry.put(serviceInterface.getName(), impl);

    }

    static class ServersTask implements Runnable {

        Socket client = null;

        public ServersTask(Socket socket) {

            this.client = socket;

        }

        ObjectInputStream input = null;//输入流

        ObjectOutputStream output = null;//输出流

        @Override

        public void run() {

            //接收客户端发送来的字节流,并转化成对象,反射调用服务实现者,获取执行结果

            try {

                input = new ObjectInputStream(this.client.getInputStream());

                String interfaceName = input.readUTF();

                String methodName = input.readUTF();

                Class<?>[] parameterType = (Class<?>[]) input.readObject();

                Object[] args = (Object[]) input.readObject();

                Class serverClass = serviceRegistry.get(interfaceName);//这里有问题服务器端去注册中心拉取实现类??

                                                                    //但是如果不考虑注册中心,当作本地映射还挺好,

                                                                    //省的使用反射来通过接口来找实现类.

                if (serverClass == null) {

                    throw new ClassNotFoundException(interfaceName + " not found");

                }

                Method method = serverClass.getMethod(methodName, parameterType);

                Object result = method.invoke(serverClass.newInstance(), args);

                //执行结果反序列化返回给客户端

                output = new ObjectOutputStream(this.client.getOutputStream());

                output.writeObject(result);

            } catch (Exception e) {

                e.printStackTrace();

            } finally {

                if (output != null) {

                    try {

                        output.close();

                    } catch (IOException e) {

                        e.printStackTrace();

                    }

                }

                if (input != null) {

                    try {

                        input.close();

                    } catch (IOException e) {

                        e.printStackTrace();

                    }

                }

                if (this.client != null) {

                    try {

                        this.client.close();

                    } catch (IOException e) {

                        e.printStackTrace();

                    }

                }

            }

        }

    }

}

mainapp

package com.peiyu.rpcs.bios;

import java.io.IOException;

public class MainApp {

    public static void main(String[] args) throws Exception {

        IRpcServers server = new RpcServesrImpl(8080);

        server.register(IOrderService.class, IOrderServiceImpl.class);

        server.start();

    }

}

一个接口一个实现类

package com.peiyu.rpcs.bios;

public interface IOrderService {

    String getOrderDtoByUserId(int i);

}

package com.peiyu.rpcs.bios;

public class IOrderServiceImpl implements IOrderService{

    @Override

    public String getOrderDtoByUserId(int i) {

        // TODO Auto-generated method stub

        return 100*i+"";

    }

}

客户端

package com.peiyu.rpcs.bios;

public class CLIENT {

    public static void main(String[] args) {

    long start =System.currentTimeMillis();

    for (int i=0;i<200;i++){

        try {

            IOrderService orderService= ProxyFactory.create(IOrderService.class,"127.0.0.1",8080);

            System.out.println(orderService.getOrderDtoByUserId(i));

        }catch (Exception e){

            e.printStackTrace();

        }

    }

    long end=System.currentTimeMillis();

    System.out.println("总耗时："+(end-start));

}

}

代理

package com.peiyu.rpcs.bios;

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.Socket;

public class ProxyFactory<T> {

    public static <T> T create(final Class<?> serviceInterface, final String ip, final int port) {

        //将本地的接口调用转换成JDK的动态代理，在动态代理中实现接口的远程调用

        return (T) Proxy.newProxyInstance(serviceInterface.getClassLoader(), new Class<?>[]{serviceInterface}, new ProxyHandler(ip, port, serviceInterface));

    }

    static class ProxyHandler implements InvocationHandler {

        private String ip;

        private int port;

        private Class<?> serviceInterface;

        public ProxyHandler(String ip, int port, Class<?> serviceInterface) {

            this.ip = ip;

            this.port = port;

            this.serviceInterface = serviceInterface;

        }

        @Override

        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

            Socket socket = null;

            ObjectOutputStream output = null;

            ObjectInputStream input = null;

            try {

                // 创建Socket客户端，根据指定地址连接远程服务提供者

                socket = new Socket(ip, port);

                // 将远程服务调用所需的接口类、方法名、参数列表等编码后发送给服务提供者

                output = new ObjectOutputStream(socket.getOutputStream());

                output.writeUTF(serviceInterface.getName());

                output.writeUTF(method.getName());

                output.writeObject(method.getParameterTypes());

                output.writeObject(args);

                // 同步阻塞等待服务器返回应答，获取应答后返回

                input = new ObjectInputStream(socket.getInputStream());

                return input.readObject();

            } finally {

                if (socket != null) {

                    socket.close();

                }

                if (output != null) {

                    output.close();

                }

                if (input != null) {

                    input.close();

                }

            }

        }

    }

}

本地接口

package com.peiyu.rpcs.bios;

public interface IOrderService {

    String getOrderDtoByUserId(int i);

}

总结与注意点:

1:output.writeUTF(serviceInterface.getName());这里面是包名+接口名

2:这个是网上的代码,有些问题,注册中心serviceRegistry = new HashMap<String, Class>();写在了服务端,应该是客户端拉取才对,是不是客户端传output.writeUTF(com.peiyu.rpcs.bios.IOrderServiceImpl);才对呢?我想是,待考证(错误)

3.这个RPC如果不用serviceRegistry 映射,则需要通过接口找到实现类,这个就很麻烦

补充: 从注册中心拉取的是

//从ZK中获取地址 127.0.0.1:12345

        String discover = serviceDiscovery.discover(rpcRequest.getClassName());

　客户端拉取的是ip地址+端口号,比如说俩个服务,zookeeper存储接口名和地址,

192.168.126.166:20880 和192.168.166.188:20880,　客户端选择一个ip地址就实现了负载均衡,这样客户端还还是向其中一个服务发送端口,服务的从Map<接口,实现类.Class>来get一个impl.整个思想就完成了

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　atzhang

巴特西

手写RPC

最新文章

热门文章