[ovirt-devel] Certain questions about Quartz based scheduling in oVirt

[Moti Asayag]

Hi Shubhendu,

----- Original Message -----
> From: "Shubhendu Tripathi" <shtripat at redhat.com>
> To: devel at ovirt.org
> Sent: Monday, November 24, 2014 8:58:34 AM
> Subject: [ovirt-devel] Certain questions about Quartz based scheduling in	oVirt
> 
> Hi All,
> 
> We are in a requirement where we need to schedule jobs at certain time
> interval, hourly, daily, weekly and monthly (i.e. repetitive and cron
> kind of scheduling).
> I was trying to understand quartz based scheduling mechanism in oVirt to
> achieve the scenarios.
> 
> Have some basic questions regarding the same -
> 1. Is there is mechanism to persist the scheduling data in oVirt ?

In ovirt we do not persist the jobs. The application reschedule the jobs when it starts
and programmatically triggers jobs when required.

On packaging/services/ovirt-engine/ovirt-engine.xml.in we specify the job store configuration
as RAMJobStore, which is a volatile:

    <property name="org.quartz.jobStore.class" value="org.quartz.simpl.RAMJobStore"/>

You may select other implementation. See:
http://quartz-scheduler.org/api/2.2.0/org/quartz/spi/JobStore.html

> 2. How to tackle edit and rescheduling of jobs ?
> 

You can have a look at org.ovirt.engine.core.utils.timer.SchedulerUtil interface in 
the 'scheduler' project which provides that functionality, and the related classes.

But if not special requirements, i guess the shipped quartz implementation should be
enough:

http://quartz-scheduler.org/documentation/quartz-2.x/tutorials/tutorial-lesson-05

> Kindly guide on how to achieve these.
> 
> Thanks and Regards,
> Shubhendu
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