[rules-users] Checking fact "id"

[Massi Gmail]

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 < mmquelo at 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
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