Forgetting the use of Drools how do you determine (programmatically) which is the main contract and which are related?

Once you can answer this your Drools solution should become self evident.

when

$mc: Contract(type == "main" )

then

#rule fired over "the" main contract

end

when

$rc: Contract(type == "related" )

then

#rule fired over "a" related contract

end

A relationship

when

$mc: Contract( )

then

#rule fired over "the" main contract

end

when

$mc: Contract( )

$rc: Contract( ) from $mc.contracts

then

#rule fired over "a" related contract

end

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:

$mc: Contract() from maincontract

#rule fired over "the" main contract

$rc: Contract() from relatedcontract

#rule fired over "a" related contract

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

----- Original Message -----

From: Edson Tirelli

Sent: Saturday, January 05, 2008 12:00 PM

Subject: Re: [rules-users] Checking fact "id"

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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