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

[raffi]

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.



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