[rules-users] Ruleflow and persistence

[Kris Verlaenen]

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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