Re: [rules-users] Absence Pattern question

Try a rule with a timer: rule AnoB timer( int: 3m ) when $a: A( status == "waiting for B" ) not B( this after $a ) then modify( $a ){ setStatus( "no B within 3m after me" ) } end Untested. -W On 5 July 2011 13:00, wendy <w.mungovan(a)yahoo.com&gt; wrote: > Hi, > I'm having trouble writing an absence pattern. What I'm trying to do is > detect when there is an A followed by no Bs for 3+minutes. I don't care > if > there is more than one A. What I'm running into is that when I try to use > 'over window:time' the time within drools is the end time of the window. > So > this means I need to write the no Bs for 3+ min first: > > not( $b: B() over window:time(3m)) > > then try to find the A before it: > > $now: Long() from RuleUtilityFunctions.getSessionClockTime() > $a: A( this before [3m] $now) > > then I should have to check to make sure that I don't have any Bs between > $a's time and the start of the no B window: > > not( B( time >= $a.time, > time <= $now)) > > This is not working. I think that it has something to do with my function > to get the session clock time (RuleUtilityFunctions.getSessionClockTime()) > and how things get evaluated within the Rete engine. Because it does not > seem like $now is getting re-evaluated on future calls that pass the $b > condition. If I replace $now with the call to getSessionClockTime() > everything just seems to get weird. > > I've tried to write the rule forward too. Look for A followed by no B but > that does not seem to work because A is matched at the current time and > the > rule triggers because there is no B because the future B data has not be > inserted into working memory yet. > > What is the right way to write this rule? Is there a way to get the > start > and end time of the time window that met the over window:time() condition? > > Thank you, > Wendy > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Absence-Pattern-question-tp3140377p3140... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users