[rules-users] mixing activation-group and ruleflow-group

[Wolfgang Laun]

I'm not sure what the initial set of facts is,butI'm assuming that you
have any number of potentially matching quadruplets
Translog - Product -  ProductCategory - Category.

For good measure, I add

declare Superiors
   cname: String
   superiors: Set<String>
end

for defining, for each category, the more important categories: you'll
need to insert three static facts.

Doing away with all this non-declarative salience and flow you can now
make do with two  rules:

rule "insert recommendation"
when
   $tr:     Translog($trpid : pid)
   $p:      Product(pid == $trpid, $pid : pid, $price : price, $brand : brand)
   $pcat: ProductCategory(pid == $pid, $cid : cid)
   $cat:   Category(cid == $cid, cname == "pets", $cname : cname)
   not ( Recommendation( $xname: cname )
           and
           Superiors( cname == $cname, superiors contains $xname ) )
then
    insert(new Recommendation($pid, $price, $brand, $cname));
end

rule "remove low priorities"
when
    $recomm: Recommendation( $cname: cname )
    exists( Recommendation( $xname: cname )
                and
                Superiors( cname == $cname, superiors contains $xname ) )
then
    retract($recomm)
end

And you may add a low-salience background rule for extracting the results.

rule "show recomms"
salience -999
when
 	$recomm	: Recommendation()
then
 	System.out.println($recomm);
end

Untested!
-W

(Who eats "pets"????)

On 01/10/2012, raffi <christian.koehler at s2008.tu-chemnitz.de> wrote:
> Hi,
>
> I am novice in Drools. Up to my following problem nearly everything worked
> fine for me.
> In my case I thought mixing the two group mentioned is the right way, and
> it
> could be the right way if I use it in a correct way. The problem is that I
> don't get a result.
>
> ...
> rule "pets"
> 	salience 20
> 	ruleflow-group "pets"
> 	activation-group "categories"
>     when
>         $tr 	: Translog($trpid : pid)
>         $p		: Product(pid == $trpid, $pid : pid, $price : price, $brand :
> brand)
>         $pcat	: ProductCategory(pid == $pid, $cid : cid)
>         $cat	: Category(cid == $cid, cname == "pets", $cname : cname)
>     then
>         insert(new Recommendation($pid, $price, $brand, $cname));
> end
>
> rule "remove everything except pets"
> 	salience 19
> 	ruleflow-group "pets"
> 	when
> 		$recomm	: Recommendation((cname == "food") || (cname == "vegetable") ||
> (cname == "drinks"))
> 	then
> 		retract($recomm)
> end
>
> rule "food"
>     salience 16
>     ruleflow-group "food"
>     activation-group "categories"
>     when
>         $tr 	: Translog($trpid : pid)
>         $p		: Product(pid == $trpid, $pid : pid, $price : price, $brand :
> brand)
>         $pcat	: ProductCategory(pid == $pid, $cid : cid)
>         $cat	: Category(cid == $cid, cname == "food", $cname : cname)
>     then
>        	insert(new Recommendation($pid, $price, $brand, $cname));
> end
>
> rule "remove everything except food"
> 	salience 15
> 	ruleflow-group "food"
> 	when
> 		$recomm	: Recommendation((cname == "vegetable") || (cname == "drinks"))
> 	then
> 		retract($recomm)
> end
> ...
>
> The idea is that I firstly add a new object (Recommendation) to my working
> memory. After that I check if there are already existing
> Recommendation-objects. Such objects that are from a less important
> category
> should now be removed. The priority attribute is the /cname/ (category
> name). So in the end there can be more Recommendation objects of one
> category but never of different categories.
> I request the result in the following way (perhaps this is incorrect):
> rule "show recomms"
> 	salience 5
> 	when
> 		$recomm	: Recommendation()
> 	then
> 		System.out.println($recomm);
> end
>
> So the result is an empty console, but with my test data there should be
> two
> Recommendation objects in my working memory after terminating.
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/mixing-activation-group-and-ruleflow-group-tp4020058.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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