[jboss-user] [jBPM] - Re: Multiple Sessions - Timer Tasks - some triggered twice and some missed

[tmag]

tmag [https://community.jboss.org/people/tmag] created the discussion

"Re: Multiple Sessions - Timer Tasks - some triggered twice and some missed"

To view the discussion, visit: https://community.jboss.org/message/792814#792814

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Debugging the code - it seems +*SchedulerThreadPool*+ in +*JDKTimerService*+ is getting instantiated multiple times for some sessions and jobs getting scheduled twice.
As a work around we registered our own +*TimerService*+ and made this +*SchedulerThreadPool*+ static to get instanatiated only once (one SchedulerThreadPool per JVM) & made the pool size configurable.

Refer to  https://community.jboss.org/message/741461#741461 https://community.jboss.org/message/741461 to register your own timer service.


private static ScheduledThreadPoolExecutor scheduler;

..........................................

public MyTimerService(int size) {
        getSchedularInstance(size);
    }

private ScheduledThreadPoolExecutor getSchedularInstance(int size) {
        if(scheduler == null) {
            this.scheduler = new ScheduledThreadPoolExecutor( size );
       } else {
            System.out.println(" returning the old scheduler ...");
        }

        return this.scheduler;
    }
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