自己实现简单RPC功能
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最近对RMI RPC比较感兴趣, 所以自己做了一个简单的实现, 如果有时间,之后会继续完善。
RPC主要分为服务端与客户端。
服务端的实现如下:
- package com.zf.rpc.server;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.ObjectInput;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutput;
- import java.io.ObjectOutputStream;
- import java.io.OutputStream;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- import java.net.ServerSocket;
- import java.net.Socket;
- import java.util.concurrent.ConcurrentHashMap;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.atomic.AtomicBoolean;
- public class RPCServer {
- private static final ExecutorService taskPool = Executors.newFixedThreadPool(50) ;
- /**
- * 服务接口对象库
- * key:接口名 value:接口实现
- */
- private static final ConcurrentHashMap<String, Object> serviceTargets =
- new ConcurrentHashMap<String, Object>() ;
- private static AtomicBoolean run = new AtomicBoolean(false) ;
- /**
- * 注册服务
- * @param service
- */
- public void registService(Object service){
- Class<?>[] interfaces = service.getClass().getInterfaces() ;
- if(interfaces == null){
- throw new IllegalArgumentException("服务对象必须实现接口");
- }
- Class<?> interfacez = interfaces[0] ;
- String interfaceName = interfacez.getName() ;
- serviceTargets.put(interfaceName, service) ;
- }
- /**
- * 启动Server
- * @param port
- */
- public void startServer(final int port){
- Runnable lifeThread = new Runnable() {
- @Override
- public void run() {
- ServerSocket lifeSocket = null ;
- Socket client = null ;
- ServiceTask serviceTask = null ;
- try {
- lifeSocket = new ServerSocket(port) ;
- run.set(true) ;
- while(run.get()){
- client = lifeSocket.accept() ;
- serviceTask = new ServiceTask(client);
- serviceTask.accept() ;
- }
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- };
- taskPool.execute(lifeThread) ;
- System.out.println("服务启动成功...");
- }
- public void stopServer(){
- run.set(false) ;
- taskPool.shutdown() ;
- }
- public static final class ServiceTask implements Runnable{
- private Socket client ;
- public ServiceTask(Socket client){
- this.client = client ;
- }
- public void accept(){
- taskPool.execute(this) ;
- }
- @Override
- public void run() {
- InputStream is = null ;
- ObjectInput oi = null ;
- OutputStream os = null ;
- ObjectOutput oo = null ;
- try {
- is = client.getInputStream() ;
- os = client.getOutputStream() ;
- oi = new ObjectInputStream(is);
- String serviceName = oi.readUTF() ;
- String methodName = oi.readUTF();
- Class<?>[] paramTypes = (Class[]) oi.readObject() ;
- Object[] arguments = (Object[]) oi.readObject() ;
- System.out.println("serviceName:" + serviceName + " methodName:" + methodName);
- Object targetService = serviceTargets.get(serviceName) ;
- if(targetService == null){
- throw new ClassNotFoundException(serviceName + "服务未找到!") ;
- }
- Method targetMethod = targetService.getClass().getMethod(methodName, paramTypes) ;
- Object result = targetMethod.invoke(targetService, arguments) ;
- oo = new ObjectOutputStream(os) ;
- oo.writeObject(result) ;
- } catch (IOException e) {
- e.printStackTrace();
- } catch (ClassNotFoundException e) {
- e.printStackTrace();
- } catch (SecurityException e) {
- e.printStackTrace();
- } catch (NoSuchMethodException e) {
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
- e.printStackTrace();
- } catch (IllegalAccessException e) {
- e.printStackTrace();
- } catch (InvocationTargetException e) {
- e.printStackTrace();
- }finally{
- try {
- if(oo != null){
- oo.close() ;
- }
- if(os != null){
- os.close() ;
- }
- if(is != null){
- is.close() ;
- }
- if(oi != null){
- oi.close() ;
- }
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
客户端如下:
- package com.zf.rpc.client;
- import java.io.InputStream;
- import java.io.ObjectInput;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutput;
- import java.io.ObjectOutputStream;
- import java.io.OutputStream;
- import java.lang.reflect.InvocationHandler;
- import java.lang.reflect.Method;
- import java.lang.reflect.Proxy;
- import java.net.Socket;
- public class RPCClient {
- /**
- * 根据接口类型得到代理的接口实现
- * @param <T>
- * @param host RPC服务器IP
- * @param port RPC服务端口
- * @param serviceInterface 接口类型
- * @return 被代理的接口实现
- */
- @SuppressWarnings("unchecked")
- public static <T> T findService(final String host , final int port ,final Class<T> serviceInterface){
- return (T) Proxy.newProxyInstance(serviceInterface.getClassLoader(), new Class[]{serviceInterface}, new InvocationHandler() {
- @Override
- public Object invoke(final Object proxy, final Method method, final Object[] args)
- throws Throwable {
- Socket socket = null ;
- InputStream is = null ;
- OutputStream os = null ;
- ObjectInput oi = null ;
- ObjectOutput oo = null ;
- try {
- socket = new Socket(host, port) ;
- os = socket.getOutputStream() ;
- oo = new ObjectOutputStream(os);
- oo.writeUTF(serviceInterface.getName()) ;
- oo.writeUTF(method.getName()) ;
- oo.writeObject(method.getParameterTypes()) ;
- oo.writeObject(args);
- is = socket.getInputStream() ;
- oi = new ObjectInputStream(is) ;
- return oi.readObject() ;
- } catch (Exception e) {
- System.out.println("调用服务异常...");
- return null ;
- }finally{
- if(is != null){
- is.close() ;
- }
- if(os != null){
- is.close() ;
- }
- if(oi != null){
- is.close() ;
- }
- if(oo != null){
- is.close() ;
- }
- if(socket != null){
- is.close() ;
- }
- }
- }
- });
- }
- }
现在写一个接口和一个实现。
- package com.zf.rpc.test;
- public interface IHelloWorld {
- String sayHello(String name) ;
- }
- package com.zf.rpc.test;
- public class HelloWorld implements IHelloWorld{
- @Override
- public String sayHello(String name) {
- return "hello " + name + "!";
- }
- }
下面就可以开始测试了。
先写RPC服务端,并启动
- package com.zf.rpc.test;
- import com.zf.rpc.server.RPCServer;
- public class RPCServerTest {
- public static void main(String[] args) {
- RPCServer server = new RPCServer() ;
- server.registService(new HelloWorld()) ;
- server.startServer(8080) ;
- }
- }
启动后,会看到输出
服务启动成功...
然后写RPC客户端,并启动
- package com.zf.rpc.test;
- import com.zf.rpc.client.RPCClient;
- public class RPCClientTest {
- public static void main(String[] args) {
- IHelloWorld helloWorld =
- RPCClient.findService("127.0.0.1" , 8080 , IHelloWorld.class) ;
- String result = helloWorld.sayHello("is_zhoufeng");
- System.out.println(result );
- }
- }
会看到客户端输出:
hello is_zhoufeng!
到此, 一个远程调用就实现了。
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