RPC过程简单实现

1、主要代码
package com.github.distribute.rpc;

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;

public class RpcFramework {

public static void export(final Object service, final Class interfaceClazz, int port) throws Exception {
if (service == null) {
throw new IllegalAccessException("service instance == null");
}
if (port < 0 || port > 65535) {
throw new IllegalAccessException("Invalid port " + port);
}
System.out.println("Export service " + service.getClass().getName() + " on port " + port);

ServerSocket server = new ServerSocket(port);
//循环等待，每来一个请求开启一条线程进行处理
for (;;) {
final Socket socket = server.accept();//tcp阻塞等待
try {
new Thread(new Runnable() {

@Override
public void run() {
try {
try {
ObjectInputStream input = new ObjectInputStream(socket.getInputStream());

try {
String interfaceName = input.readUTF();
String methodName = input.readUTF();
Class<?>[] parameterTypes = (Class<?>[]) input.readObject();
Object[] arguments = (Object[]) input.readObject();
ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());

try {
if (!interfaceName.equals(interfaceClazz.getName())) {
throw new IllegalAccessException("Interface wrong, export:" + interfaceClazz
+ " refer:" + interfaceName);
}
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();
}
} catch (Throwable t) {
t.printStackTrace();
} finally {
input.close();
}
}

finally {
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
} catch (Exception e) {
e.printStackTrace();
}

}
}

@SuppressWarnings("unchecked")
public static <T> T refer(final Class<T> interfaceClass, final String host, final int port) throws Exception {
if (interfaceClass == null) {
throw new IllegalAccessException("Interface class == null");
}
if (!interfaceClass.isInterface()) {
throw new IllegalAccessException(interfaceClass.getName() + " must be interface");
}
if (host == null || host.length() == 0) {
throw new IllegalAccessException("host == null");
}
if (port <= 0 || port > 65535) {
throw new IllegalAccessException("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() {

@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
// TODO Auto-generated method stub
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(args);

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();
}
}
});
}

}

2、模拟接口
接口类
package com.github.distribute.rpc;

public interface HelloService {

String hello();

String hello(String name);

}
实现类
package com.github.distribute.rpc;

public class HelloServiceImpl implements HelloService {

@Override
public String hello() {
return "Hello";
}

@Override
public String hello(String name) {
return "Hello," + name;
}

}

3、接口提供者
package com.github.distribute.rpc;

public class RpcProvider {

public static void main(String[] args) throws Exception {
HelloService service = new HelloServiceImpl();
RpcFramework.export(service, HelloService.class, 9000);
}

}
结果：



4、消费者
package com.github.distribute.rpc;

public class RpcConsumer {
public static void main(String[] args) throws Exception {
HelloService service = RpcFramework.refer(HelloService.class, "127.0.0.1", 9000);
String result = service.hello("rod");
System.out.println(result);
}

}

结果：