[rules-users] Understanding Fusion temporal reasoning

[Edson Tirelli]

   Chris,

   Someone found a bug a couple days ago that might be affecting you too.
What happens if you write:

declare NumReading

    @role( event )

    @expires( 10s )

end

   ?

   Edson


2009/9/29 Chris Richmond <crichmond at referentia.com>

>  Hello,
>
>
>
> I am trying to make a rule to delay firing until a certain amount of time
> has passed without another event being received.  I have set up a loop that
> goes every 10 seconds in my main application that takes readings and injects
> them into the ReadingStream. These are like sensor readings.
>
>
>
>  I have a thread started at initialization that is basically calling
> fireUntilHalt() and I never call halt until shutdown, and that seams to be
> working fine.
>
>
>
> So basically any time an out of spec reading in my Reading object (<15) is
> received, I want to wait to see if a FollowUpReading is not received in the
> next 5 seconds, before I fire the results(The second rule below).  The first
> rule is there just to verify I am indeed detecting NumReadings with values <
> 15 being injected and that works fine.   Now at this point in my appication
> I am **never** inserting a FollowUpReading object/event, so I would expect
> the 2nd rule to fire all the time, however the strange thing is that it
> only fires the first time I receive a reading out of spec. I see rule one
> fire, then the seond time, but after that any subsequent out of spec
> readings received(I know they are out of spec, because rule 1 still fires
> when received) but rule 2 never fires again.  It only ever fires one time!
> This is very confusing.  These ar the only 2 rules and the only two object
> types being inserted to the stream. Know that rule 2 **can** fire because
> it does once and only once.  Why won’t it fire beyond the first time, even
> though I never insert the FollowUpReading() ?
>
>
>
> Thanks,
>
>
> Chris
>
>
>
> declare NumReading
>
>     @role( event )
>
> end
>
>
>
> declare FollowUpReading
>
>       @role(event)
>
> end
>
>
>
>
>
> rule "Determine out of spec reading"
>
> when
>
>       $n : NumReading($r:reading < 15) from entry-point "ReadingStream";
>
> then
>
>       System.err.println("Fire off a follow up reading for device: " + $n);
>
> end
>
>
>
>
>
> rule "Missed degrading confirmation reading"
>
> when
>
>       $n : NumReading($r:reading < 15) from entry-point "ReadingStream";
>
>       not (FollowUpReading(this after[0s, 5s] $n))
>
> then
>
>       System.err.println("No good reading received for: " + $n);
>
> end
>
>
>
>
>
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>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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