No single simple answer here. You need to check what would better fit your use case.
   The thing is: it is not possible to limit the number of matches to a collect statement... all matching instances WILL match it and be collected.

   No really "clean" way I can think about, but a few possible options (haven't executed them, but shall work):

1. Simply execute the actions multiple times in the consequence:

when

   eventList : LinkedList( $size : size >= 5 ) from collect( Event(text matches ".*rule5.*" ))
then
   for( int i = 0; i < $size/5; i++ )

       System.out.println("rule5 is fired " + eventList.size ());

end

2. Flag used facts:

when

   eventList : LinkedList( size >= 5 ) from collect( Event(text matches ".*rule5.*", processed == false ))
then
   System.out.println("rule5 is fired " + eventList.size());
   for( int i = 0; i < 5; i++ ) {
       Event e = (Event) eventList.get ( i );
       e.setProcessed( true );
       update( e );

   }

end

2. Retract used facts:

when

   eventList : LinkedList( size >= 5 ) from collect( Event(text matches ".*rule5.*" ))
then
   System.out.println("rule5 is fired " + eventList.size());
   for( int i = 0; i < 5; i++ ) {
       Event e = (Event) eventList.get( i );
       retract( e );

   }

end

    Hope it helps.

    Edson

2007/8/10, Anh Vuong <anhtvuong@yahoo.com>:

Hi,

I'd like to use keyword collect to do my filtering but its behaviour confused me, please advise. I greatly appreciate your help.

 

Problem 1:

 

when

eventList : LinkedList(size == 5)

from collect( Event(text matches

".*rule5.*" ))

then

System.out.println(

"rule5 is fired " + eventList.size());

 

I still do not see any log msg after adding 5+ events. Is something wrong with my rule?

 

Problem 2:

 

when

event: Event(text matches ".*rule5.*" ))

eventList : LinkedList(size == 5)

from collect( Event(text == event.text)

then

System.out.println(

"rule5 is fired " + eventList.size());

 

After adding 5 events, I see 5 log msg instead of one as I'd expect.

If I add more events, I will see more log. How do I tell LHS  to reset the count from 0.

Basically, I want to take 1 event out of 5 similar events (suppressing filtering). So if there are 10 similar events, my RHS should activate 2 times, not 10 times.

 

Thanks,

-av

 

---

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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
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