[rules-users] Shadow fact problem?

[Anstis, Michael (M.)]

Sorry to push Edson,

The performance degradation from having the "parental check" in the RHS
versus the LHS is (expectedly) terrific. We have thousands of
"attributes" relating to different parent objects and having the rule
activate for every combination is causing performance problems. Moving
the RHS into a LHS "eval" would be no better either.

On a different matter, I have successfully installed the source with
Maven (thanks Mark) and can debug trunk in Eclipse at home!

With kind regards,

Mike

-----Original Message-----
From: Anstis, Michael (M.) 
Sent: 14 March 2007 12:28
To: 'Rules Users List'
Subject: RE: [rules-users] Shadow fact problem?

OK, Edson, I will try to check it out (I'm having problems accessing
subversion from work so will try from home).

Whilst trying to implement a workaround though I may have discovered
another problem (which might have been fixed too):-

rule "A"
when
	MaterialEntry ( $m : material )
	$a2 : Attribute( name ==
Constants.ATTRIBUTES_MATERIAL_LOCK_PRESSURE, $mlp : number, parent == $m
)
	$a3 : Attribute( name ==
Constants.ATTRIBUTES_MATERIAL_LOCK_PRESSURE_MODIFIER, $lpm : number,
parent == $m )
then
	System.out.println("Rule A"); //<-- Never fires
end

rule "B"
when
	MaterialEntry ( $m : material )
	$a2 : Attribute( name ==
Constants.ATTRIBUTES_MATERIAL_LOCK_PRESSURE, $mlp : number )
	$a3 : Attribute( name ==
Constants.ATTRIBUTES_MATERIAL_LOCK_PRESSURE_MODIFIER, $lpm : number )
Then
	if($a2.getParent() == $m && $a3.getParent() == $m) {
		System.out.println("Rule B"); //<-- Fires
	}
end

If the check for "parent" being equal across $m, $a2 and $a3 is in the
LHS the rule doesn't activate. However if check is in the RHS the rule
is OK.

Any thoughts or views (Edson)?

Thanks,

Mike 

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: 13 March 2007 22:57
To: Rules Users List
Subject: Re: [rules-users] Shadow fact problem?


   Mike,

   Yes, that is a "shadow fact unwanted side-effect" (nice name for a 
bug hm? :) ), but I remember fixing something similar as part of another

ticket I was working on. Is it possible for you to verify if the problem

is happening in trunk?
   If it is still hapenning, let me know and I will fix it.

   Thank you,
       Edson

Anstis, Michael (M.) wrote:

> Hi,
>
> I am running 3.1-M1 and have (by way of example) two simple rules; A 
> and B as follows:-
>
>       *rule* "A"
>       *when*
>               $a1 : Attribute ( name == Constants.ATTRIBUTES_A, $pa :
>       number )
>               $a2 : Attribute ( name == Constants.ATTRIBUTES_B, $nc :
>       number )
>               $p : Process ( attributesList* contains* $a1,
>       attributesList* contains* $a2 )
>       *then*
>              * double* txy = doSomeMaths($pa, $nc, $p);
>               Attribute a =* new* Attribute(Constants.ATTRIBUTES_C,
txy);
>               $p.addAttribute(a);
>              * assertLogical*(a);
>              * modify*($p);
>               System.out.println("Rule 'A' fired");
>       *end*
>                              
>       *rule* "B"
>       *when*
>               $a1 : Attribute ( name == Constants.ATTRIBUTES_C, $txy :
>       number)
>               $p : Process( attributesList* contains* $a1 )    
>                               // <-- Line causing rule not to activate
>
>       *then*
>              * double* m = doSomeMoreMaths($txy, $p);
>               System.out.println("Rule 'B' fired");
>       *end*
>
> Process exposes an ArrayList of Attribute objects (each having a 
> name\value pair).
>
> When the content of the ArrayList held by Process is added to (Rule 
> 'A') the next rule (Rule 'B') is not being activated.
>
> Can anybody provide any insight into how best a workaround can be 
> engineered?
>
> With kind regards,
>
> Mike
>
>-----------------------------------------------------------------------
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>
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>rules-users at lists.jboss.org
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>  
>


-- 
 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
 Office: +55 11 3124-6000
 Mobile: +55 11 9218-4151
 JBoss, a division of Red Hat @ www.jboss.com


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