ok
But i think I do not need to differentiate them.
I try to explain it better.
I have got a set of "Contract" class Facts. All of them inserted into the
working memory.
But Just one of them is the "main contract", all the others all "related
contracts".
So , when i write a rule I need to distinguish between a "main contract" (which
is unique along the session)
and a "related contract".
I should write rules like the followings:
when
$mc: Contract() from maincontract
then
#rule fired over "the" main contract
end
when
$rc: Contract() from relatedcontract
then
#rule fired over "a" related contract
end
I think the only solution to do that is to make "maincontract" and
"relatedcontracr" globals.
But, if I make them globals, then the rule engine will not be notified about
their changes and
I do want it to be notified about it.
Should I make them "globals" and "facts" as well?
Can globals be inserted into the WM as well? Is it too horrible? :D
Thank u anyway.
Massi
----- Original Message -----
From: Edson Tirelli
To: Rules Users List
Sent: Saturday, January 05, 2008 12:00 PM
Subject: Re: [rules-users] Checking fact "id"
What attribute differentiates A1 from A2?
Such scenarios usually are solved by an additional constraint...
[]s
Edson
2008/1/4, Massi Gmail < [EMAIL PROTECTED]>:
Hi guys,
Now I am strugglin' with "fact id checking" or whatever we can call it....
:D
Let's take into account the followong scenario:
I have class A (it's just a name) javabeans to be inserted into the WM.
I define two objects of class A: A1 and A2.
Somewhere I do "insert(A1)" and "insert(A2)" ( let's say I do it in the
same package of R1 and R2..see below...)
Then I define two different rules R1 and R2 that reason over class "A"
facts (let's say R1 and R2 are in the same package) .
The point is.... I want R1 to fire only on A1 and R2 only on A2.
Is that possible in drools? Is there a sort of "fact id" I can reason over?
I do not think globals will be of any help, cause in the guide i have read
that globals should never be used within LHS.
We should never reason over globals.
Let me know.
Massi
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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
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