CODEWITHSUNDEEP
javascheduled-tasksquartz-schedulerschedulerjob-scheduling
sydnal
sydnal

Reputation: 317

Java Job Scheduling: Is this possible with Quartz, if not what are my alternatives?

I need to schedule some periodic jobs and I have hit a roadblock with Quartz.

For example:

I do not think this is possible with Quartz (with a single expression/job):

If it was between 8:00 and 12:00 it would be easy but I could not find a way to schedule it except handling 8:30-9:00 and 12:00-12:45 with separate expressions, which I do not want to.

Am I wrong in assuming that this is non-trivial with Quartz? I have also searched for some alternatives but most seem to have a similar cron syntax and I am not sure they could handle it either.

Is there a finer-grained scheduling library that I can use in this scenario?

Upvotes: 1

Views: 1311

Answers (2)

Jan Moravec
Jan Moravec

Reputation: 1880

This is perfectly possible with Quartz and a single trigger. People often focus on Cron triggers, but Quartz supports other trigger types and these are often more suitable. To implement your scheduling scenario, I recommend that you look into the Quartz DailyTimeIntervalTrigger.

In the screenshot below you can see a DailyTimeIntervalTrigger example with attribute values to cover your use-case.

DailyTimeIntervalTrigger Example

Upvotes: 1

Andrew T Finnell
Andrew T Finnell

Reputation: 13638

I'm not certain you can do this, as you've hinted at. It seems possible to create a custom Trigger to do it, but then it becomes quite a bit of work. The other option is to split the dual Triggers by day, not time.

public class TestQuartz {
    class ActualJob implements Job {
        @Override
        public void execute(JobExecutionContext context) 
             throws JobExecutionException {
        }
    }

    class DailyJob implements Job {
        @Override
        public void execute(JobExecutionContext context)
            throws JobExecutionException {
            // Run from now (8:45) every 5 minutes until 12:45 (endDate)
            Trigger trigger =
                newTrigger()
                    .startNow()
                    .endAt(endDate) // 12:45 PM TODAY
                    .withSchedule(
                        cronSchedule("0 0/5 * 1/1 * ? *"))
                    .build();

            try {
                Scheduler sched = context.getScheduler();
                sched.scheduleJob(newJob(ActualJob.class).build(), trigger);
            } catch (SchedulerException ex) {
                throw new JobExecutionException(ex);
            }
        }
    }

    @Test
    public void testQuartz() throws SchedulerException {
        SchedulerFactory sf = new StdSchedulerFactory();
        Scheduler sched = sf.getScheduler();
        // Run once a day starting at 8:45 AM
        Trigger dailyTrigger =
            newTrigger().withSchedule(cronSchedule("0 45 8 1/1 * ? *")).build();
        JobDetail job = newJob(DailyJob.class).build();
        sched.scheduleJob(job, dailyTrigger);
    }
}

Upvotes: 1

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