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 < mmquelo@gmail.com>:

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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