Hi guys,
is it possible to trigger a scheduler once after every deployment? So the regular schedule time is 4 hours, but it will took 4 hours for the first run.
Any property to set?
Br,
Tim
Solved! Go to Solution.
Hi,
I see. The only chance to get it working the way you want is to trigger the scheduled job manually on activation of a SCR component/service.
Jörg
Maybe you can schedule it again when activating the component?
@Activate or @Modified
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Can you point me to an example?
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Let me try to see if I understand correctly what you're trying to achieve here.
You have application code (an OSGi component) that schedules a specific task, every 4 hours. You want this task to be done after you've deployed your application code aswell. Let's take the following code as your OSGi component as an example:
import org.apache.sling.commons.scheduler.ScheduleOptions;
import org.apache.sling.commons.scheduler.Scheduler;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.ConfigurationPolicy;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.metatype.annotations.Designate;
@Component(service = CustomSchedulerServiceImpl.class, configurationPolicy = ConfigurationPolicy.REQUIRE, immediate = true)
public class CustomSchedulerServiceImpl implements CustomSchedulerServiceImpl {
/**
* Cron formatted scheduling expression
*/
private String schedulerExpression;
@Reference
private Scheduler scheduler;
/**
* Activate.
*
* @param config the polling service config
*/
@Activate
public void activate(final Map<String, Object> config) {
this.schedulerExpression = <YOUR CRON EXPRESSION HERE PREFERABLY FROM CONFIG>
scheduleNow();
scheduleLater();
}
@Override
public void scheduleLater() {
final ScheduleOptions scheduleOptions = scheduler.EXPR(schedulerExpression);
scheduler.schedule(tireDesignsFetchJobFactory.createJob(), scheduleOptions);
}
@Override
public void scheduleINow() {
final ScheduleOptions scheduleOptions = scheduler.NOW();
scheduler.schedule(tireDesignsFetchJobFactory.createJob(), scheduleOptions);
}
}
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I have an actual scheduler but it runs not on startup only after the 4 hours of waiting and I want it the be run immediately.
What's that: tireDesignsFetchJobFactory.createJob()
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WHen setting up a schedule - are you using the org.apache.sling.commons.scheduler.Scheduler API?
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@Component(enabled = true, immediate = true, metatype = true, label = "cron job",
description = "cron job ")
@Service(value = Runnable.class)
@Properties({
@Property(name = "scheduler.expression", value = "0 0/15 * * * ?", description = "Cron-job expression Ex: '0 0/15 * * * ?' for 15 Mins"),
@Property(name = "scheduler.concurrent", boolValue = false)
})
@Slf4j
public class TestScheduler implements Runnable {
...
}
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I am not sure if I understood it correctly, but will an expression like below help ?
0 0 */4 ? * * - It will run every 4 hours starting next closest hour .. Unfortunately i could find one which start immediately
My bad
This was code that I've written for a project of mine and I wanted to remove anything that didn't have anything to do with your question. Seems like I missed something!
Anyway, that "tireDesignFactory" simply creates a new instance that implements Runnable, like your TestScheduler. (So it's custom code)
Your TestScheduler is not a scheduler, but a job itself. If you would use my example and create a factory that returns a new Runnable instance, then your scheduler service will schedule the job at a specific time, and you can also ask it to schedule a job right after you instantiate your bundle with the @Activate annotated method.
You would get something like this:
import org.apache.sling.commons.scheduler.ScheduleOptions;
import org.apache.sling.commons.scheduler.Scheduler;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.ConfigurationPolicy;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.metatype.annotations.Designate;
@Component(service = CustomSchedulerService.class, configurationPolicy = ConfigurationPolicy.REQUIRE, immediate = true)
public class CustomSchedulerServiceImpl implements CustomSchedulerService {
private String schedulerExpression;
@Reference
private Scheduler scheduler;
@Reference
private CustomJobFactory factory;
@Activate
public void activate(final Map<String, Object> config) {
this.schedulerExpression = <YOUR CRON EXPRESSION HERE PREFERABLY FROM CONFIG>
scheduleNow();
scheduleLater();
}
@Override
public void scheduleLater() {
final ScheduleOptions scheduleOptions = scheduler.EXPR(schedulerExpression);
scheduler.schedule(factory.createJob(), scheduleOptions);
}
@Override
public void scheduleINow() {
final ScheduleOptions scheduleOptions = scheduler.NOW();
scheduler.schedule(factory.createJob(), scheduleOptions);
}
}
------------------
import org.apache.sling.commons.scheduler.ScheduleOptions;
import org.apache.sling.commons.scheduler.Scheduler;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.ConfigurationPolicy;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.metatype.annotations.Designate;
@Component(service = CustomJobFactory.class, immediate = true)
public class CustomJobFactoryImpl implements CustomJobFactory {
//you can use this class to get references from the OSGi container and pass those to your CustomJob instances
@Override
public void createJob() {
return new CustomJob();
}
}
--------------------
import org.apache.sling.commons.scheduler.Job;
import org.apache.sling.commons.scheduler.JobContext;
public class CustomJob implements Job {
public CustomJob() {
}
@Override
public void execute(final JobContext jobContext) {
//do something
}
}
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What do you want to achieve? Can we rephrase your requirement to something like this: "By default the scheduling interval should be 4 hours. In case it is taking more time, the process should not run in parallel, but serialized"?
In that case the section "preventing concurrent execution" of Apache Sling :: Scheduler Service (commons scheduler) is covering that.
Jörg
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If want to achieve that the scheduler runs directly on statup/after deployment but it seems it just starting after 4 hours for the first time and after that every 4 hours.
The problem is the scheduler pulls data into AEM and otherwise I have to wait 4 hours for the very first execution.
So the component shows nothing for the first 4 hours.
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This is an interesting use case - when you setup a scheduler to fire every 4 hours - the first time it will count 4 hours. See if you can modify the code to fire once 1 when its activated.
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Hi,
I see. The only chance to get it working the way you want is to trigger the scheduled job manually on activation of a SCR component/service.
Jörg
Yes that what i thought, but then it will block all other components on startup because its maybe running for 30 minutes. So no chance to do it this way. I have to create a new Service and trigger it by a custom scheduler.
Thanks for all replies.
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I don't think that you need to do this. You can use the Scheduler API to immediately fire an event. But yes, you need to trigger that in an activate method.
Jörg
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So would it come down to the example I provided? (More or less)
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I guess so. But please validate, that the case of some activations/deactivations of the component in a short time is handled properly :-) Depending on your deployment processes this might happen.
Jörg
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