How to run every 25 seconds in Quartz scheduler?

Question

I am using the Quartz Scheduling API for Java. Could you help me to run every 25 seconds using cron-expression. It\'s just a delay. It does not have to start always at second 0.

Answer 1

*/25 * * * * *

- [wiki] http://en.wikipedia.org/wiki/Cron
- [quartz tutorial] http://www.quartz-scheduler.org/docs/tutorial/TutorialLesson06.html

Answer 2

The only way to do this with a cron trigger is so complicated as to be useless; you're much better off with the SimpleTrigger from other answers. Nevertheless, if it has to be cron, you need to set up five different cron triggers:

 0/25 0/5 * * * *
15/25 1/5 * * * *
 5/25 2/5 * * * *
20/25 3/5 * * * *
10/25 4/5 * * * *

The first trigger fires at 0:00:25, 0:00:50; then the second trigger fires at 0:01:15 and 0:01:40; the third at 0:02:05, 0:02:30, 0:02:55; the fourth at 0:03:20, 0:03:45; and finally the fifth at 0:04:10 and 0:04:35. The first trigger then takes over again at 0:05:00, etc.

This only works because 25 seconds divides evenly into 5 minutes (which in turn goes evenly into an hour). If you wanted it every 23 seconds? Forget about it!

Answer 3

You could schedule the job to run constantly but throttle the frequency using Camel's Throttler.

<route>
  <from uri="jms:queue:TestQueue"/>
  <!-- throttle 1 messages per 25 sec -->
  <throttle timePeriodMillis="25000">
    <constant>1</constant>
    <to uri="bean:TestBean?method=testMethod"/>
  </throttle>
</route>

Answer 4

I don't think cron expression will allow you to do that, but you can use

SimpleScheduleBuilder.repeatSecondlyForever( 25 )

as 300 (5 minutes) is a multiple of 25 it will repeat automatically.

Answer 5

If you want a job to trigger at a regular interval then you can use a Quartz SimpleTrigger with a repeatInterval specified.

Answer 6

You can't have a schedule like that for quartz.

One thing you could do is schedule a wrapper job to run every 5 seconds, and only do any work every fifth execution.