[rules-users] Count matching facts

[Edson Tirelli]

   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
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