How can I call a function every day at 00:00 in my web service

Question

My problem is that I have a RESTful Web Service using a class Gestion. In this class, I have a function _update_, and I would like to call this function everyday at 00:00.

I had no idea how to do that, so I looked into the Web, and I found that using threads might be a good option. However, I don't know how I can use it. Do I have to move my _update_ function into a new class ?

Oh sorry, I totally forgot to mention that. I'm using Java, with Jersey 2, on a Tomcat 7.0 Servlet Container. — Quentin Moreaux, May 12 '15 at 07:56
Use a cron job library like [Quartz](http://www.quartz-scheduler.org/). — , May 12 '15 at 08:01

kwisatz · Answer 1 · 2015-05-12T08:27:17.293

1

If you are using EJB you can use the timer service

@Singleton
public class TimerService {
    @Inject
    HelloService helloService;

    @Schedule(second="0", minute="0", hour="0")
    public void update(){
        System.out.println("timer: " + helloService.sayHello());
    }
}

https://docs.oracle.com/javaee/7/tutorial/ejb-basicexamples004.htm

edited May 12 '15 at 08:27

answered May 12 '15 at 08:19

kwisatz

1,266
3
16
36

Sadly, I'm not using EJB. :( I'm still gonna try and see how to use it. – Quentin Moreaux May 12 '15 at 08:25

score 1 · Answer 2 · edited May 23 '17 at 11:58

Use any open source job or schedulers more details are here. http://toppersworld.com/top-10-open-source-java-job-schedulers/ Or do pure coding. This link may help you. Get milliseconds until midnight. Sleep until midnight in a thread and wake up do task and go and sleep again.

@Override
public void run() {
    while (true) {
        try {
            Thread.sleep(calculateSleepingTime());
            // do what ever you want
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

private long calculateSleepingTime() throws ParseException {

    Calendar c = Calendar.getInstance();
    c.add(Calendar.DAY_OF_MONTH, 1);
    c.set(Calendar.HOUR_OF_DAY, 0);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);
    return (c.getTimeInMillis()-System.currentTimeMillis());
}

How can I call a function every day at 00:00 in my web service

2 Answers2