[jboss-user] [EJB 3.0] - design pattern for canceling an EJB3 timer
do-not-reply at jboss.com
Thu May 3 17:26:42 EDT 2007
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?
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