[rules-users] Ruleflow and persistence

[Kris Verlaenen]

You should be using the update($p) to notify the change of the Product to 
the engine and no-loop to prevent looping in this case.  And doing that, 
everything seems to work correctly (in both cases)?

I will take a look at why your initial results were different, basically the 
$price variable in the LHS of your rule gets assigned a value the last time 
the Product object was inserted or updated.  It seems to be using a more 
recent value if used in combination with ruleflow though.

What do you mean by "But I have the same result without my ruleflow."?  Your 
ruleflow makes sure that your global rule will always be executed before 
your local rule.  It is possible that, if you remove your ruleflow, the 
behaviour is the same (as in some situations the global rule might still get 
executed before the local rule).  However, if you would for example increase 
the salience of your local rule, it will always be executed first without 
ruleflow, but always second in case your ruleflow is used.  Similarly, the 
ruleflow would prevent the global rule from triggering again if the local 
rule would update the Product again.

Kris

----- Original Message ----- 
From: "DELBART Vincent" <delbart.v at mipih.fr>
To: "Rules Users List" <rules-users at lists.jboss.org>
Sent: Monday, September 10, 2007 4:50 PM
Subject: RE: [rules-users] Ruleflow and persistence


>I have really those results in the first set (I put a project in the forum)
>
> If I put an update I loop...
>
> With a no-loop it seems work... But I have the same result without my 
> ruleflow.
>
> vdelbart
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org 
> [mailto:rules-users-bounces at lists.jboss.org] De la part de Kris Verlaenen
> Envoyé : lundi 10 septembre 2007 16:37
> À : Rules Users List
> Objet : Re: [rules-users] Ruleflow and persistence
>
> The expected behavior is actually the second one, did you really get those 
> results when executing the first set?  The reason is that you should 
> notify the engine if you change a product (so it can re-evaluate). 
> Otherwise, it will never know that the product has changed price and will 
> still use the old price.  So you should add a update($p) statement after 
> changing your product if you want the engine to take that change into 
> account.
>
> Kris
>
>
> ----- Original Message ----- 
> From: "vdelbart" <delbart.v at mipih.fr>
> To: <rules-users at lists.jboss.org>
> Sent: Monday, September 10, 2007 4:17 PM
> Subject: [rules-users] Ruleflow and persistence
>
>
>>
>> Hello,
>>
>> I have a problem with this ruleflow :
>>
>> http://www.nabble.com/file/p12593732/ruleflow.jpg
>>
>> This two rules package doesn't work in the same way :
>>
>> First package :
>>
>> #created on: 29 août 2007
>> package reductionExample1
>>
>> import model.*
>>
>> rule "global rule"
>> ruleflow-group "WorldReduction"
>> #include attributes such as "salience" here...
>> when
>> $p:Product(year == 2006)
>> then
>> #actions
>> System.out.println("Global rule");
>> System.out.println("$p.getPrice() : " + $p.getPrice());
>> $p.setPrice($p.getPrice()*1.1);
>> end
>> rule "local rule"
>> ruleflow-group "StateReduction"
>> #include attributes such as "salience" here...
>> when
>> $p:Product(year < 2007, $price: price)
>> then
>> #actions
>> System.out.println("Local rule");
>> System.out.println("$price : " + $price);
>> System.out.println("$p.getPrice() : " + $p.getPrice());
>> $p.setPrice($price * 1.2);
>> end
>>
>> I have :
>> Before : Product(name=Adidas, year=2006, price=100.0)
>> Global rule
>> $p.getPrice() : 100.0
>> Local rule
>> $price : 110.00000000000001
>> $p.getPrice() : 110.00000000000001
>> After : Product(name=Adidas, year=2006, price=132.0)
>>
>>
>> Second package :
>>
>> #created on: 29 août 2007
>> package reductionExample1
>>
>> import model.*
>>
>> rule "global rule"
>> ruleflow-group "WorldReduction"
>> #include attributes such as "salience" here...
>> when
>> $p:Product(year == 2006, $priceGlobal: price)
>> then
>> #actions
>> System.out.println("Global rule");
>> System.out.println("$price : " + $priceGlobal);
>> System.out.println("$p.getPrice() : " + $p.getPrice());
>> $p.setPrice($p.getPrice()*1.1);
>> end
>> rule "local rule"
>> ruleflow-group "StateReduction"
>> #include attributes such as "salience" here...
>> when
>> $p:Product(year < 2007, $price: price)
>> then
>> #actions
>> System.out.println("Local rule");
>> System.out.println("$price : " + $price);
>> System.out.println("$p.getPrice() : " + $p.getPrice());
>> $p.setPrice($price * 1.2);
>> end
>>
>> I have :
>>
>> Before : Product(name=Adidas, year=2006, price=100.0)
>> Global rule
>> $price : 100.0
>> $p.getPrice() : 100.0
>> Local rule
>> $price : 100.0
>> $p.getPrice() : 110.00000000000001
>> After : Product(name=Adidas, year=2006, price=120.0)
>>
>>
>> What is the normal execution (for me the first way) and why is different 
>> ?
>>
>> thanks,
>>
>> vdelbart
>>
>> -- 
>> View this message in context:
>> http://www.nabble.com/Ruleflow-and-persistence-tf4415033.html#a12593732
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
>>
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