[rules-users] Temporal constraints

[Chris Richmond]

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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