EJB @Schedule wait until method completed

Question

I want to write a back-ground job (EJB 3.1), which executes every minute. For this I use the following annotation:

@Schedule(minute = \"*/1\", hour = \"*\")
         


        

Answer 1

I ran into the same problem but solved it slightly differently.

@Singleton
public class DoStuffTask {

    @Resource
    private TimerService timerSvc;

    @Timeout
    public void doStuff(Timer t) {
        try {
            doActualStuff(t);
        } catch (Exception e) {
            LOG.warn("Error running task", e);
        }
        scheduleStuff();
    }

    private void doActualStuff(Timer t) {

        LOG.info("Doing Stuff " + t.getInfo());
    }

    @PostConstruct
    public void initialise() {
        scheduleStuff();
    }

    private void scheduleStuff() {
        timerSvc.createSingleActionTimer(1000l, new TimerConfig());
    }

    public void stop() {
        for(Timer timer : timerSvc.getTimers()) {
            timer.cancel();
        }
    }

}

This works by setting up a task to execute in the future (in this case, in one second). At the end of the task, it schedules the task again.

EDIT: Updated to refactor the "stuff" into another method so that we can guard for exceptions so that the rescheduling of the timer always happens