Java实现简易RPC框架（二）

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分布式应用

上一遍blog我们已经说过了RPC的相关知识，接下来我们利用socket来实现RPC。

一、利用socket、动态代理实现RPC

参考阿里梁飞同学网上的例子，并调整单服务多线程模式，首先是框架代码

package org.bird.rpc;

import java.io.IOException;
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;
import java.util.HashMap;
import java.util.Map;
/**
 * RPC框架
 * @author liangjf
 *
 */
public class RpcFramework {
	static ServerSocket server = null;
	static Map<String,Object> serviceMap = new HashMap<String,Object>();
	/** 
     * 暴露服务 
	 * @param <C>
     *  
     * @param service 服务实现 
     * @param port 服务端口 
     * @throws Exception 
     */  
    public static <C> void export(final Object service, final 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);  
        
        if(server == null) {
        	server = new ServerSocket(port);
        }else if(server.getLocalPort() != port) {
        	server = new ServerSocket(port);
        }
        Class<Object>[] classs = (Class<Object>[]) service.getClass().getInterfaces();
        for(Class<Object> c : classs){
        	serviceMap.put(c.getName() + "|" + port, service);
        }
       
        new Thread(new Runnable(){//创建后台线程进行socket监听
			public void run() {
				while(true) {
				try {
					final Socket socket = server.accept(); 
	                        try {  
	                            try {  
	                                ObjectInputStream input = new ObjectInputStream(socket.getInputStream());  
	                                try { 
	                                	String interfaceName = input.readUTF();//客户端调用的接口
	                                    String methodName = input.readUTF();//service是服务器端提供服务的对象，但是，要通过获取到的调用方法的名称，参数类型，以及参数来选择对象的方法，并调用。获得方法的名称  
	                                    Class<?>[] parameterTypes = (Class<?>[])input.readObject();//获得参数的类型  
	                                    Object[] arguments = (Object[])input.readObject();//获得参数  
	                                    
	                                    Object remoter = RpcFramework.getService(interfaceName + "|" + port);
	                                    ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());  
	                                    try {  
	                                        Method method = remoter.getClass().getMethod(methodName, parameterTypes);//通过反射机制获得方法  
	                                        Object result = method.invoke(remoter, arguments);//通过反射机制获得类的方法，并调用这个方法  
	                                        output.writeObject(result);//将结果发送  
	                                    } catch (Throwable t) {  
	                                        output.writeObject(t);  
	                                    } finally {  
	                                        output.close();  
	                                    }  
	                                } finally {  
	                                    input.close();  
	                                }  
	                            } finally {  
	                                socket.close();  
	                            }  
	                        } catch (Exception e) {  
	                            e.printStackTrace();  
	                        }    
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			}
        	
        }).start(); 
    } 
    
    /** 
     * 引用服务 
     *  
     * @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 
     *///原理是通过代理，获得服务器端接口的一个“代理”的对象。对这个对象的所有操作都会调用invoke函数，在invoke函数中，是将被调用的函数名，参数列表和参数发送到服务器，并接收服务器处理的结果  
    @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 InvocationHandler() {//jdk动态代理,内部类 
            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(interfaceClass.getName());
                        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();  
                }  
            }  
        });  
    } 
    
    private static Object getService(String name) {
    	return serviceMap.get(name);
    }
}

接着写两个需要暴露的服务接口

package org.bird.rpc;

/**
 * 服务接口
 * @author liangjf
 *
 */
public interface HelloService {
	
	String hello(String name);
}

package org.bird.rpc;
/**
 * 服务接口
 * @author liangjf
 *
 */
public interface GoodByeService {

	public String sayGoodBye(String name);
}

实现服务类

package org.bird.rpc.impl;

import org.bird.rpc.HelloService;

public class HelloServiceImpl implements HelloService {
	
	public String hello(String name) {
		return "Hello " + name;
	}
}

package org.bird.rpc.impl;

import org.bird.rpc.GoodByeService;

public class GoodByeServiceImpl implements GoodByeService {

	public String sayGoodBye(String name) {
		return "Good Bye " + name;
	}
}

接着写一个服务器测试类

package org.bird.rpc;

import org.bird.rpc.impl.GoodByeServiceImpl;
import org.bird.rpc.impl.HelloServiceImpl;
/**
 * 服务器
 * @author liangjf
 *
 */
public class Service {
	
	public  static void main(String[] args) throws Exception {
		HelloService helloService = new HelloServiceImpl();
		GoodByeService goodbyeService = new GoodByeServiceImpl();
		RpcFramework.export(helloService, Util.SP);
		RpcFramework.export(goodbyeService, Util.SP);
	}
}

最后写一个远程客户端测试类

package org.bird.rpc;

/**
 * 客户端
 * @author liangjf
 *
 */
public class Client {

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		 HelloService service = RpcFramework.refer(HelloService.class,Util.SIP, Util.SP);    
		 for (int i = 0; i < 5; i++) {    
			 String hello = service.hello("World" + i);    
			 System.out.println(hello);    
			 Thread.sleep(2000);    
		 }  
	     GoodByeService goodbyeService = RpcFramework.refer(GoodByeService.class, Util.SIP, Util.SP);   
	     for(int i = 0 ; i < 5; i++) {
	    	 String goodbye = goodbyeService.sayGoodBye("ljf" + i);
	    	 System.out.println(goodbye);
	    	 Thread.sleep(2000);
	     }
	}

}

IP跟端口辅助类

package org.bird.rpc;

public class Util {
	static String SIP = "127.0.0.1";
	static int SP = 8888;
}

1、首先将RpcFramework、HelloService、GoodByeService、HelloServiceImpl、GoodByeServiceImpl、Service、Util这些类一起打包成可运行的server.jar；将RpcFramework、HelloService、GoodByeService、Client、Util这些类一起打包成两个可运行的client1.jar、client2.jar。

2、然后在命令行模式下通过java -jar server.jar命令启动server端

3、再打开一个命令行窗口启动客户端client1