手撕Java之Rpc调用
天飞 2017-12-17 11:03:17 浏览21 评论0RPC java Server string static exception class void Ping Socket service input
摘要： 参照《分布式服务框架原理与实践-李林锋》的书， 代码调出功能来了。 向更高的服务架构技能进发！ 颤抖吧，老IT！
参照《分布式服务框架原理与实践-李林锋》的书，
代码调出功能来了。
向更高的服务架构技能进发！
颤抖吧，老IT！
package echorpc;
public interface EchoService {
String echo(String ping);
}
package echorpc;
public class EchoServiceImpl implements EchoService{
@Override
public String echo(String ping) {
return ping != null ? ping + " --> I am ok." : " I am ok.";
}
}
package echorpc;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Method;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
public class RpcExporter {
static Executor executor =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
public static void exporter(String hostName, int port) throws Exception {
ServerSocket server = new ServerSocket();
server.bind(new InetSocketAddress(hostName, port));
try {
while(true) {
executor.execute(new ExporterTask(server.accept()));
}
} finally {
server.close();
}
}
private static class ExporterTask implements Runnable{
Socket client = null;
public ExporterTask(Socket client) {
this.client = client;
}
@Override
public void run() {
ObjectInputStream input = null;
ObjectOutputStream output = null;
try {
input = new ObjectInputStream(client.getInputStream());
String interfaceName = input.readUTF();
Class<?> service = Class.forName(interfaceName);
String methodName = input.readUTF();
Class<?>[] parameterTypes = (Class<?>[])input.readObject();
Object[] arguments = (Object[])input.readObject();
Method method = service.getMethod(methodName, parameterTypes);
Object result = method.invoke(service.newInstance(),arguments);
output = new ObjectOutputStream(client.getOutputStream());
output.writeObject(result);
} catch(Exception e) {
e.printStackTrace();
} finally {
if (output != null)
try {
output.close();
} catch(IOException e) {
e.printStackTrace();
}
if (input != null)
try {
input.close();
} catch(IOException e) {
e.printStackTrace();
}
if (client != null)
try {
client.close();
} catch(IOException e) {
e.printStackTrace();
}
}
}
}
}
package echorpc;
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.InetSocketAddress;
import java.net.Socket;
public class RpcImporter<S> {
@SuppressWarnings("unchecked")
public S importer(final Class<?> serviceClass, final InetSocketAddress addr) {
return (S) Proxy.newProxyInstance(serviceClass.getClassLoader(),
new Class<?>[] {serviceClass.getInterfaces()[0]},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Socket socket = null;
ObjectOutputStream output = null;
ObjectInputStream input = null;
try {
socket = new Socket();
socket.connect(addr);
output = new ObjectOutputStream(socket.getOutputStream());
output.writeUTF(serviceClass.getName());
output.writeUTF(method.getName());
output.writeObject(method.getParameterTypes());
output.writeObject(args);
input = new ObjectInputStream(socket.getInputStream());
return input.readObject();
} finally {
if (socket != null)
socket.close();
if (input != null)
input.close();
if (output != null)
output.close();
}
}
});
}
}
package echorpc;
import java.net.InetSocketAddress;
public class echorpc {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
new Thread(new Runnable() {
@Override
public void run() {
try {
RpcExporter.exporter("localhost", 8088);
} catch (Exception e) {
e.printStackTrace();
}
}
}
).start();
RpcImporter<EchoService> importer = new RpcImporter<EchoService>();
EchoService echo = importer.importer(EchoServiceImpl.class,
new InetSocketAddress("localhost", 8088));
System.out.println(echo.echo("Are you all ok?"));
}
}
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