1、基于类级别的调用
(1)编写接口类UserInfoService.java
public interface UserInfoService {
String getUserName() throws InterruptedException;
}
(2)编写对应的实现类UserInfoServiceImpl.java
public class UserInfoServiceImpl implements UserInfoService {
@Override
public String getUserName() throws InterruptedException {
System.out.println("123");
Thread.sleep(500);
System.out.println("456");
return "tim";
}
}
(3) 测试代码
public static void main(String[] args) {
TimeLimiter timeLimiter = new SimpleTimeLimiter();
UserInfoService userInfoService = new UserInfoServiceImpl();
UserInfoService userInfoService1 = timeLimiter.newProxy(userInfoService, UserInfoService.class, 20, TimeUnit.MILLISECONDS);
try {
String userName = userInfoService1.getUserName();
System.out.println("userName:" + userName);
} catch (Exception e) {
e.printStackTrace();
}
}
(4)综合上述可以写成更通用的
/**
* @author chenjintian
* @email [email protected]
* @date 2018/9/29
* Description:
*/
public class UserInfoServiceImpl implements UserInfoService {
private static final TimeLimiter TIME_LIMITER = new SimpleTimeLimiter();
// 设置为可配置
private static final long TIME_OUT_DURATION = 200;
private static UserInfoService userInfoServiceProxy;
static {
UserInfoService userInfoService = new UserInfoServiceImpl();
userInfoServiceProxy = TIME_LIMITER.newProxy(userInfoService, UserInfoService.class, TIME_OUT_DURATION, TimeUnit.MILLISECONDS);
}
@Override
public String getUserName(String info) throws InterruptedException {
System.out.println("123");
Thread.sleep(500);
System.out.println("456");
return info;
}
@Override
public String getUserNameWithTimeout(String info) throws InterruptedException {
return userInfoServiceProxy.getUserName(info);
}
@Override
public String getSex(String txt) {
return "";
}
@Override
public String getSexWithTimeout(String txt) {
return userInfoServiceProxy.getSex(txt);
}
public static void main(String[] args) throws InterruptedException {
UserInfoService userInfoService = new UserInfoServiceImpl();
String result = userInfoService.getUserNameWithTimeout("tim");
System.out.println("result is:" + result);
}
}
2、基于方法级别的调用
public class SimpleTimeLimiterDemo {
public static void main(String[] args) {
SimpleTimeLimiter simpleTimeLimiter = new SimpleTimeLimiter();
final AtomicBoolean isInterrupted = new AtomicBoolean();
Callable<String> task = new Callable<String>() {
@Override
public String call() throws Exception {
isInterrupted.set(true);
Thread.sleep(200);
isInterrupted.set(false);
return "success";
}
};
try {
String result = simpleTimeLimiter.callWithTimeout(task, 20, TimeUnit.MILLISECONDS, true);
System.out.println(result);
} catch (Exception e) {
e.printStackTrace();
}
}
}
分析:
上述代码实现调用方法超时后会报错。
查看源码本质上,Google的SimpleTimeLimiter是对Executor的future的包装。