Re: [rules-users] How to design a rule using collect for filtering? Thanks.

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(a)yahoo.com&gt;: -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com