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();
}
}
}