[rules-users] Count matching facts

[cfili]

Thanks for your suggestions.


Edson Tirelli-3 wrote:
> 
>    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.
>>
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>>
> 
> 
> 
> -- 
>   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
> 
> 

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