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Using timers with EJB3.0 entity beans

Posted on 2006-10-27
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Last Modified: 2008-03-17
I am attempting to use TimerService with an entity bean in an EJB3.0 application.  I have spent a couple of days looking for a way to get the EntityContext so that I can call EntityContext.getTimerService().  The problem is that EJB3.0 entity beans annotated with @Entity don't support @Resource injection.  I have tried implementing the setEntityContext() method but, given that I am not implementing javax.ejb.EntityBean, that unsuprisingly didn't work.  How do I get the EntityContext from an entity bean annotated with @Entity?  Is there a different way to get the TimerService?  My code follows:


@Entity
@Table(name = "periodic_script")
public class PeriodicScript {

    private static final long serialVersionUID = 1;

    // Entity bean properties
        .
        .
        .

    private EntityContext ctx;
      
    public void setEntityContext(EntityContext ec) {
          this.ctx = ec;
    }
   
        .
        .
        .

    @PostPersist
    public void scheduleScriptExecution() {
      ctx.getTimerService().createTimer(Calendar.getInstance().getTime(), getPeriod() * 1000, getId());
    }

    @Timeout
    public void executeScript(Timer timer) {
        // logic to execute when timeout occurs
            .
            .
            .
    }
      
    @PreRemove
    public void removeTimer() {
      for (Object timerObject : ctx.getTimerService().getTimers()) {
          Timer timer = (Timer) timerObject;
          if (timer.getInfo().equals(getId())) {
            timer.cancel();
          }
      }
    }
      
        .
        .
        .

}
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Question by:bbkeppler
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2 Comments
 
LVL 19

Accepted Solution

by:
ramazanyich earned 2000 total points
ID: 17854172
On page 482 of EJB3 specification:
"Timers can be created for stateless session beans, message-driven beans, and 2.1 entity beans.
Timers cannot be created for stateful session beans[94] or EJB 3.0 entities."

So you can't use timer in class annotted by @Entity
0
 

Author Comment

by:bbkeppler
ID: 17857953
Thanks to ramazanyich for that answer.  I had perused the EJB 3.0 spec looking for the answer, but apparently I passed right over the relavent sentence.
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