[rules-users] Count matching facts

[Edson Tirelli]

   Not really... all solutions are variations of this. :(

   We do intent to develop things equivalent to SQL group by, unique, etc
clauses... but no such feature today.

   []s
   Edson

2008/1/29, cfili <cfilippelli at cerner.com>:
>
>
> Yeah I tried your first suggestion and ran into the duplication.  I'd
> rather
> not create a new fact for each one of these... any other way of avoiding
> it?
>
>
> Edson Tirelli-3 wrote:
> >
> >    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 at post.com>:
> >>
> >>
> >>    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 at cerner.com>:
> >> >
> >> >
> >> > 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 at 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 at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Count-matching-facts-tp15160392p15163614.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users at 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
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