scheduled job to run with play 2.0

[chamnan huon]

Hello everyone,

Is there a way to get a scheduled job to run with play 2.0 ? 

I have an email sending job every Monday at 8:00PM. 

Thank you

Chamnan

[Alex Hanschke]

Hi Chamnan,

you might take a look at Akka documentation to schedule jobs in Play: http://www.playframework.org/documentation/2.0.1/JavaAkka


Cheers,
Alex

[chamnan huon]

Hi, did you have sample for this. I try to read it is difficult to understand it. Like :

ActorRef myActor = Akka.system().actorOf(new Props(MyActor.class));

but I don't know what does it do in class MyActor.class.

Thank you

Chamnan

[Alex Hanschke]

My knowledge on Akka is quite limited, so I can only point you to the tutorial: http://doc.akka.io/docs/akka/2.0.2/intro/getting-started-first-java.html

Basically you can send your email from within an actor as is described in the aformentioned docs (see section 'Creating the worker').

Cheers,
Alex

[sun]

You can use the scheduler (http://doc.akka.io/docs/akka/2.0.2/scala/
scheduler.html) but you have to calculate the difference between
current time and monday 8pm youself.

[biesior]

Try this in your Global.java class

import akka.util.Duration;

import org.joda.time.DateTime;

import org.joda.time.DateTimeConstants;

import play.Application;

import play.GlobalSettings;

import play.Logger;

import play.libs.Akka;

import java.util.concurrent.TimeUnit;

import static org.joda.time.Seconds.secondsBetween;

public class Global extends GlobalSettings {

    @Override

    public void onStart(Application application) {

        DateTime now = new DateTime();

        DateTime plannedStart = new DateTime()

                .withDayOfWeek(DateTimeConstants.THURSDAY)

                .withHourOfDay(14)

                .withMinuteOfHour(3)

                .withSecondOfMinute(0)

                .withMillisOfSecond(0);

        DateTime nextRun = (now.isAfter(plannedStart))

                ? plannedStart.plusWeeks(1)

                : plannedStart;

        Long nextRunInSeconds = (long) secondsBetween(now, nextRun).getSeconds();

        Akka.system().scheduler().schedule(

                Duration.create(nextRunInSeconds, TimeUnit.SECONDS),

                Duration.create(5, TimeUnit.SECONDS) ,

                new Runnable() {

                    public void run() {

                        Logger.info("I started at thursday and will return here in next 5 seconds, now it's " + new DateTime());

                    }

                }

        );

    }

}

BTW, you don't need to creaty many topics for the same problem.

[biesior]

of course in your case there are other settings for plannedStart

       DateTime plannedStart = new DateTime()

                .withDayOfWeek(DateTimeConstants.MONDAY)

                .withHourOfDay(20)

                .withMinuteOfHour(0)

                .withSecondOfMinute(0)

                .withMillisOfSecond(0);

[chamnan huon]

Thank you for your answer.
But it seem that It will repeat every 5 seconds.
What I want is like this :
It should trigger on Monday at 8:00PM, 04 June.
And then It should trigger again on Monday at 8:00PM, 11, June.
....

What should I do it ? Can we use akka as crond job ?

Thank you
Chamnan

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[biesior]

Yes, it repeats every 5 seconds and it's even written in the log message to make it clear for test and see that works.

It shouldn't be set to start at 4-th of Juny as it's past date, therefore there's condition to find nearest monday in the future

plannedStart.plusWeeks(1) 

It's really sample snippet and you can see without looking to the API, where is the frequency set, second parameter of schedule() determines it.

Duration.create(5, TimeUnit.SECONDS)

set it to

Duration.create(7, TimeUnit.DAYS)

See also:

http://doc.akka.io/docs/akka/2.0/java/scheduler.html
http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/TimeUnit.html