Reschedule quartz trigger

[arushi tomar]

I am trying to learn quartz. I have main method

    public static void main(String[] args) throws SchedulerException {
		
		try {
			JobDetail job1 = JobBuilder.newJob(Job1.class).withIdentity("job1", "group1").build();

			Trigger trigger1 = TriggerBuilder.newTrigger().withIdentity("cronTrigger1", "group1")
					.withSchedule(CronScheduleBuilder.weeklyOnDayAndHourAndMinute(3, 12, 38)).build();

			Scheduler scheduler1 = new StdSchedulerFactory().getScheduler();
			scheduler1.start();
			scheduler1.scheduleJob(job1, trigger1);

     scheduler1.shutdown();
    }

		catch (Exception e) {
		 e.printStackTrace();
		} 

Which works fine. It prints to the console on 3rd day of the week at 12:38 pm.
Now, what I want to do is to reschedule the trigger, so that it deletes the previous stored trigger and creates a new trigger with new schedule.

I read a lot of things at a lot of places but I just can't seem to understand clearly what I actually have to do, for ex:

     public void execute(JobExecutionContext context) throws JobExecutionException {
    Trigger newTigger = what ever you want;
    Trigger oldTrigger = context.getTrigger()
    Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
    scheduler.rescheduleJob(oldTrigger.getKey(), newTrigger);
    }

and also this:

// Define a new Trigger

   Trigger trigger = newTrigger() 
    .withIdentity("newTrigger", "group1") 
    .startNow() 
    .build(); 

// tell the scheduler to remove the old trigger with the given key, and
// put the new one in its place

   sched.rescheduleJob(triggerKey("oldTrigger", "group1"), trigger); 

but I can't understand the approach(I do understand what is happening in the code though). Thanks in advance.

[Anayonkar Shivalkar]

Hi arushi,

Though I'm not much aware of quartz (looks like a job scheduler) - I think this question is more quartz specific than Java specific.

Did you try to get in touch with somebody who knows quartz?

[arushi tomar]

Anayonkar Shivalkar wrote:Hi arushi

Yes it is, but I could not find Quartz forum here. And I don't know people who know quartz so I'm stuck all by myself.

[Anayonkar Shivalkar]

Yes that is why I couldn't move your post to proper forum

Anyways I just checked API documentation (please note that I have zero knowledge in quartz internals) and found that rescheduleJob(<-click) needs a new trigger with same job name and group name.

I can see that your new trigger does not contain job name. Maybe you can try forJob(<-click).

I hope this helps.

[Bhavani Muthu]

While rescheduling a job it fire at once before the scheduled time..did any body faced this issue

[Tim Holloway]

I put this in "Other Application Frameworks". It may not be the best forum for it, but it fits. Quartz is a framework for doing scheduled operations, much like the Unix "cron" service does.

I haven't worked with Quartz lately, but I believe it supports both one-shot tasks and regularly repeated tasks. You can keep the task schedule in persistent storage or just in-memory.

There's also a Spring Scheduling module and it supports Quartz.

I think the question was in how to get work done at a regularly-scheduled interval, and yes, Quartz is very much about that. You don't have to manually re-schedule repeated tasks, just set up the time/day(s) that it should do the task and Quartz will handle dispatching that task automatically.