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
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