Re: [rules-users] Count matching facts

Sorry, my previous suggestion will count the same process name multiple times. There are a few ways to avoid it. I would probably use a helper fact: rule XYZ when $p : Process( $name : name ) not( ProcessCount( name == $name ) ) Number( $count : intValue) from accumulate( $i : Process( name == $name, this != $p ), count( $i ) ) then System.out.println( "There are "+$count+" instances of processes named "+$name ); insert( new ProcessCount( $name, $count ) ); end Hope it helps, Edson 2008/1/29, Edson Tirelli <tirelli(a)post.com&gt;: > > > Try that: > > rule XYZ > when > $p : Process( $name : name ) > Number( $count : intValue) from accumulate( > $i : Process( name == $name, this != $p ), > count( $i ) ) > then > System.out.println( "There are "+$count+" instances of processes named > "+$name ); > end > > []s > Edson > > > 2008/1/29, cfili <cfilippelli(a)cerner.com&gt;: > > > > > > I am having a hard time finding an example of what I am trying to do, > so > > maybe someone here could help me. What I am trying to do is determine > > how > > many facts fall into the same category. > > > > My facts are 'processes' and one of their attributes is a 'name'. My > > goal > > is to determine how many processes with the same name are running. The > > problem is I do not know ahead of time the process names available, I > > want > > to determine that set at runtime. Also, once I determine the count for > > a > > given name, I do not want to run it again for the other processes that > > fall > > in that name category. > > > > I think "from collect" is probably what I want to use here, but I am > not > > sure how to grab the names in my Pattern from the fact I am currently > > iterating on. > > > > Thanks. > > -- > > View this message in context: > > http://www.nabble.com/Count-matching-facts-tp15160392p15160392.html > > Sent from the drools - user mailing list archive at Nabble.com. > > > > _______________________________________________ > > rules-users mailing list > > rules-users(a)lists.jboss.org > > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > > -- > Edson Tirelli > JBoss Drools Core Development > Office: +55 11 3529-6000 > Mobile: +55 11 9287-5646 > JBoss, a division of Red Hat @ www.jboss.com -- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users