一个简单的rpc框架的实现

编程技术  /  houtizong 发布于 3年前   104

 

为了降低开发成本，提升已有系统的利用率，企业往往会构建自己的SOA体系结构，SOA构建的手段有多种，可以通过webservice，restful，rmi，socket等等，笔者通过java socket，来构建一个简单的SOA体系结构，以下代码仅供参考。

 

 

1.  需要实现SOA的服务接口

 

package com.chenkangxian.rpc.impl;/** * * @Author: chenkangxian * * @Annotation: 根据key取数据接口 * * @Date:2012-5-13 * * @Copyright: 2012 chenkangxian, All rights reserved. * */public interface DataService {    String getData(String key);}

 

2.   接口的实现

 

 

package com.chenkangxian.rpc.impl;/** * * @Author: chenkangxian * * @Annotation: 根据key取数据服务实现 * * @Date:2012-5-13 * * @Copyright: 2012 chenkangxian, All rights reserved. * */public class DataServiceImpl implements DataService {public String getData(String key) {        return "this is the data when key = " + key ;    }}

 

 

3.  执行代理

 

 

/** *  */package com.chenkangxian.rpc.impl;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.net.Socket;/** * @Author: chenkangxian * * @Annotation: 执行代理 * * @Date:2012-5-15 * * @Copyright: 2012 chenkangxian, All rights reserved. *  */public class InvocationProxy implements InvocationHandler{private String host;private int port;public InvocationProxy(String host, int port){this.host = host;this.port = port;}public Object invoke(Object proxy, Method method, Object[] arguments) 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(arguments);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();}}}

 

4.    服务消费者

 

 

package com.chenkangxian.rpc.impl;/** * @Author: chenkangxian * * @Annotation: 服务消费者 * * @Date:2012-5-13 * * @Copyright: 2012 chenkangxian, All rights reserved. * */public class RpcConsumer {        public static void main(String[] args) throws Exception {        DataService service = RpcFramework.refer(DataService.class, "127.0.0.1", 1234);        for (int i = 0; i < Integer.MAX_VALUE; i ++) {            String value = service.getData("key_" + i);            System.out.println(value);            Thread.sleep(1000);        }    }    }

 

5.    远程调用框架

 

 

package com.chenkangxian.rpc.impl;import java.lang.reflect.Proxy;import java.net.ServerSocket;import java.net.Socket;/** * * @Author: chenkangxian * * @Annotation: 简单的远程调用框架实现 * * @Date:2012-5-13 * * @Copyright: 2012 chenkangxian, All rights reserved. * */public class RpcFramework {/** * 暴露服务 *  * Author: chenkangxian * * Last Modification Time: 2012-5-15 * * @param service 服务实现 * @param port 服务端口 * @throws Exception */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("Invalid 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();ThreadPoolHelp.getExecutorInstance().execute(new WorkThread(service, socket));} catch (Exception e) {e.printStackTrace();}}}/** * 引用服务 *  * Author: chenkangxian * * Last Modification Time: 2012-5-15 * * @param <T> 接口泛型 * @param interfaceClass 接口类型 * @param host 服务器主机名 * @param port 服务器端口 * @return 远程服务 * @throws Exception */@SuppressWarnings("unchecked")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.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 InvocationProxy(host,port));}}

 

 

6.    服务提供者

 

 

package com.chenkangxian.rpc.impl;/** * @Author: chenkangxian * * @Annotation: 服务提供者 * * @Date:2012-5-13 * * @Copyright: 2012 chenkangxian, All rights reserved. * */public class RpcProvider {    public static void main(String[] args) throws Exception {        DataService service = new DataServiceImpl();        RpcFramework.export(service, 1234);    }}

 

7.    线程池帮助类

 

 

/** *  */package com.chenkangxian.rpc.impl;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * @Author: chenkangxian * * @Annotation:  线程池帮助类 * * @Date:2012-5-15 * * @Copyright: 2012 chenkangxian, All rights reserved. *  */public class ThreadPoolHelp {private static ExecutorService executor ;static{executor = Executors.newFixedThreadPool(20);}public static ExecutorService getExecutorInstance(){return executor;}}

 

 

8.    工作线程

 

 

/** *  */package com.chenkangxian.rpc.impl;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.lang.reflect.Method;import java.net.Socket;/** * * @Author: chenkangxian * * @Annotation: 工作线程 * * @Date:2012-5-15 * * @Copyright: 2012 chenkangxian, All rights reserved. *  */public class WorkThread implements Runnable {private Object service;private Socket socket;public WorkThread(Object service,Socket socket){this.service = service;this.socket = socket;}    @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();        }    }}