design pattern for canceling an EJB3 timer

[ajay662]

I need some advice on how to cancel an active EJB3 timer. Currently below is the flow of things in my application

1. Client schedules a task via SLSB.
2. SLSB validates task parameters and queues a JMS msg, passing it the Task Object.
3. Corresponding MDB gets the JMS message and depending on scheduling params starts a timer for the task.
4. On timer expiration the @Timeout method on MDB is called, which executes the task

In between 1 and 4, client my request to cancel this task via SLSB. In this case SLSB will set the 'cancelRequested' flag on the Task Object.

In 4 above, the MDB @Timeout method checks if the 'cancelRequested' flag is set. If cancel is requested it wouldn't perform the task and if this timer was of a recurring nature it will also cancel the timer.

Problem is user has to wait till next timer expiration (i.e. until @Timeout method is called) to see if the task was successfully canceled. I need a way to cancel the timer right away when user requests to cancel the task. In order to cancel the timer, I need the TimerHandle. How can I access the TimerHandle to be able to cancel the timer right away?

Thanks

[wolfc]

messageDriveContext.getTimerService().getTimers();

Iterate until you find the right one, and cancel it.

[ajay662]

Thanks. Does it need to be done from the same MDB (class) which created the timer?

[wolfc]

Yes.

[ajay662]

Thanks.

As I iterate through the timers and find the one that I need to cancel, is there a way to know if a @Timeout callback is in progress for that Timer object? I don't see anything on the Timer class for this.