背景:
发现公司几个运行10年的游戏,用的竟然是rmi,而我只听说过dubbo 和 基于netty的rpc,于是就补充了下rmi。
其次,是最近对于跨服的思考,如何避免回调也需要用同步写法,rmi比较适合。
1)api
游戏服之间的交互 // 必须抛出RemoteException异常
package com.example.testsb.testrmi.api;
import com.example.testsb.testrmi.common.CSLogin;
import com.example.testsb.testrmi.common.SCLogin;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface IGameService extends Remote {
// 简单的rpc接口
String hello(String str) throws RemoteException;
// 请求和返回都是复杂对象的rpc接口
SCLogin login(CSLogin req) throws RemoteException;
}
2)通用部分
package com.example.testsb.testrmi.common;
public class Constant {
public final static int GAME_SERVICE_PORT = 6000;
public final static String GAME_SERVICE_URL = String.format("rmi://localhost:%d/IGameService", GAME_SERVICE_PORT);
}
复杂协议 // 必须实现:Serializable接口
package com.example.testsb.testrmi.common;
import lombok.Data;
import java.io.Serializable;
@Data
public class CSLogin implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
private String password;
}
package com.example.testsb.testrmi.common;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class SCLogin implements Serializable {
private static final long serialVersionUID = 1L;
private long uid;
}
3)服务端
package com.example.testsb.testrmi.server;
import com.example.testsb.testrmi.api.IGameService;
import com.example.testsb.testrmi.common.Constant;
import com.example.testsb.testrmi.server.impl.GameServiceImpl;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
public class Server {
public static void main(String[] args) throws RemoteException, MalformedURLException {
IGameService gameService = new GameServiceImpl();
LocateRegistry.createRegistry(Constant.GAME_SERVICE_PORT);
Naming.rebind(Constant.GAME_SERVICE_URL, gameService);
}
}
/*
[2024-03-19 07:14:13.601] [RMI TCP Connection(4)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:13.602] [RMI TCP Connection(4)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:13.603] [RMI TCP Connection(4)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:13.604] [RMI TCP Connection(4)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.975] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.982] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.984] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.986] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.988] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.993] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.995] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:29.997] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:30.000] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
[2024-03-19 07:14:30.002] [RMI TCP Connection(6)-192.168.152.1] [GameServiceImpl.java:24] ([INFO][com.example.testsb.testrmi.server.impl.GameServiceImpl] 1000 123
*/
实现
package com.example.testsb.testrmi.server.impl;
import com.example.testsb.testrmi.api.IGameService;
import com.example.testsb.testrmi.common.CSLogin;
import com.example.testsb.testrmi.common.SCLogin;
import lombok.extern.slf4j.Slf4j;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
@Slf4j
public class GameServiceImpl extends UnicastRemoteObject implements IGameService {
public GameServiceImpl() throws RemoteException {
super();
}
@Override
public String hello(String str) {
return str + "_world";
}
@Override
public SCLogin login(CSLogin req) {
log.info("{} {}", req.getName().length(), req.getPassword());
return new SCLogin(1);
}
}
4)客户端
package com.example.testsb.testrmi.client;
import com.example.testsb.testrmi.api.IGameService;
import com.example.testsb.testrmi.common.CSLogin;
import com.example.testsb.testrmi.common.Constant;
import com.example.testsb.testrmi.common.SCLogin;
import lombok.extern.slf4j.Slf4j;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
@Slf4j
public class Client {
public static void main(String[] args) throws MalformedURLException, NotBoundException, RemoteException {
IGameService gameService = (IGameService) Naming.lookup(Constant.GAME_SERVICE_URL);
String name = "";
for (int i = 0; i < 100; i++) {
name += "123456789a";
}
for (int j = 0; j < 10; j++) {
// 测试hello
String hello = gameService.hello("hello");
log.info("{}", hello);
// 测试登录接口
CSLogin csLogin = new CSLogin();
csLogin.setName(name);
csLogin.setPassword("123");
SCLogin login = gameService.login(csLogin);
log.info("{}", login);
}
}
}
/*
[2024-03-19 07:14:29.970] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.977] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.981] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.982] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.983] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.984] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.985] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.986] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.987] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.988] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.993] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.994] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.995] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.996] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.997] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:29.998] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:29.999] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:30.000] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
[2024-03-19 07:14:30.001] [main] [Client.java:26] ([INFO][com.example.testsb.testrmi.client.Client] hello_world
[2024-03-19 07:14:30.003] [main] [Client.java:33] ([INFO][com.example.testsb.testrmi.client.Client] SCLogin(uid=1)
*/
总结:
1.rmi可以看出来非常简单。
2.基于java的序列化和反序列化。
3.已解决粘包问题。