手写 RPC（一）基于 BIO，深入理解远程调用原理

                                                                              【诗119:130】你的言语一解开，就发出亮光，使愚人通达。

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目录

rpc-server-all（服务端实现）

        rpc-server-api

        rpc-server-provider

rpc-client（客户端实现）

完成 -> 测试

源码

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• 创建两个项目

服务端：rpc-server-all

客户端：rpc-client

 

• rpc-server-all（服务端实现）

---

服务端创建两个模块

• rpc-server-api：供客户端使用的 API
• rpc-server-provider： api 的具体实现以及 bio 服务器的实现

• rpc-server-api

IHelloSevice（对外发布的接口）

public interface IHelloSevice {
    String sayHello(String name);
    void saveUser(User user);
}

RpcRequest（请求体)，自己生成 get和set

package com.ddup.rpc;
import java.io.Serializable;
/**
 * 请求体
 */
public class RpcRequest implements Serializable {
    public String className;//类名
    public String methodName;//方法名
    public Object[] parameters;//请求实参
}

User （业务entity，get和set忽略,自己生成）

public class User implements Serializable {
    private String name;
    private int age;
}

最后：maven -> install（把此模块打成 jar 到本地仓库，对外提供调用）

• rpc-server-provider

pom.xml 引入 rpc-server-api

        
            com.ddup.rpc
            rpc-server-api
            1.0-SNAPSHOT
        

 业务实现

public class HelloServerImpl implements IHelloSevice {

    @Override
    public String sayHello(String name) {
        System.out.println("reqeust in content : " + name);
        return "hello " + name;
    }

    @Override
    public void saveUser(User user) {
        System.out.println("request in saveUser : "+ user.toString());

    }

服务端：RpcProxyServer

package com.ddup.rpc;
/**
 * 服务端：阻塞接收请求
 */
public class RpcProxyServer {
    /**
     * 缓存线程池
     */
    private ExecutorService executorService = Executors.newCachedThreadPool();

    public void publish(int port, Object service) {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(port);
            while (true) {
                Socket socket = serverSocket.accept();
                // 利用多线程处理任务
                executorService.execute(new ProcessorHandler(socket, service));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

请求处理类：ProcessorHandler

package com.ddup.rpc;
/**
 * 用以处理请求，反射实现
 */
public class ProcessorHandler implements Runnable {
    private Socket socket;
    private Object service;

    public ProcessorHandler(Socket socket, Object service) {
        this.socket = socket;
        this.service = service;
    }

    @Override
    public void run() {
        try {
            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            RpcRequest request = (RpcRequest) ois.readObject();
            Object result = invoke(request);
            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            // 结果返回给客户端
            oos.writeObject(result);
            oos.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public Object invoke(RpcRequest request) {
        Object result = null;
        try {
            // 获取形参类型
            Object[] parameters = request.getParameters();
            Class[] parameterTypes = new Class[parameters.length];
            for (int i = 0; i < parameters.length; i++) {
                parameterTypes[i] = parameters[i].getClass();
            }
            String className = request.getClassName();
            Class clzz = Class.forName(className);
            String methodName = request.getMethodName();
            // 找到方法
            Method method = clzz.getMethod(methodName, parameterTypes);
            //反射调用
            result = method.invoke(service, parameters);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        return result;
    }
}

启动

package com.ddup.rpc;

/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) {
        
        HelloServerImpl helloServer = new HelloServerImpl();
        RpcProxyServer rpcProxyServer = new RpcProxyServer();
        rpcProxyServer.publish(8080,helloServer);
    }
}

服务端结构

服务端完成.......

• rpc-client（客户端实现）

---

RpcProxyClient）

package com.ddup.rpc;
import java.lang.reflect.Proxy;
/**
 * 客户端：用以生成所要调用接口的代理类
 */
public class RpcProxyClient {

    public  T clientProxy(final Class interfaceCls,String host,int port) {
            return (T)Proxy.newProxyInstance(interfaceCls.getClassLoader(), new Class[]{interfaceCls}, new RemoteInvocationHandler(host,port));
    }
}

RemoteInvocationHandler 

实现 InvocationHandler 接口，用以生成代理类，持有代理方法 #invoke

package com.ddup.rpc;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
 * 执行真正方法的类，实现 InvocationHandler 接口
 */
public class RemoteInvocationHandler implements InvocationHandler {
    private String host;
    private int port;

    public RemoteInvocationHandler(String host, int port) {
        this.host = host;
        this.port = port;
    }

    /**
     * 代理方法 
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("client come in invoking...");
        // 请求体
        RpcRequest request = new RpcRequest();
        request.setClassName(method.getDeclaringClass().getName());
        request.setMethodName(method.getName());
        request.setParameters(args);
        // 发起网络传输
        RpcNetTransport rpcNetTransport = new RpcNetTransport(host, port);
        Object result = rpcNetTransport.send(request);
        return result;
    }
}

RpcNetTransport 

用以发起真正的网络传输，处理请求和响应

package com.ddup.rpc;
import java.io.*;
import java.net.Socket;
/**
 * 发起网络传输的类
 */
public class RpcNetTransport {
    private String host;
    private int port;

    public RpcNetTransport(String host, int port) {
        this.host = host;
        this.port = port;
    }

    public Object send(RpcRequest request) {
        Object result = null;
        ObjectOutputStream oos = null;
        ObjectInputStream ois = null;
        try {
            Socket socket = null;
            try {
                socket = new Socket(host, port);
            } catch (IOException e) {
                e.printStackTrace();
            }
            OutputStream os = socket.getOutputStream();
            oos = new ObjectOutputStream(os);
            oos.writeObject(request);
            oos.flush();
            InputStream is = socket.getInputStream();
            ois = new ObjectInputStream(is);
            result = ois.readObject();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (ois != null) {
                try {
                    ois.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (oos != null) {
                try {
                    oos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }
}

启动

package com.ddup.rpc;
/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) {
        RpcProxyClient rpcProxyClient = new RpcProxyClient();
        IHelloSevice iHelloSevice = rpcProxyClient.clientProxy(IHelloSevice.class,"localhost",8080);
        String zqr = iHelloSevice.sayHello("zqr");
        System.out.println(zqr);
    }
}

客户端结构

• 完成 -> 测试

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#main启动服务端 -> #main 启动客户端 —> 成功

服务端打印

客户端打印

• 源码

服务端  [email protected]:qingruizhu/rpc-server-all.git

客户端  [email protected]:qingruizhu/rpc-client.git

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