Re: [rules-users] How to handle priority in a rule

Interesting problem, you want dyanmic prioritisation based upon the value of a field. We have no declarative sugar for this, but it might make a nice use case. We could allow someone to specify an expression that determine a value of priority. salience = ($price.length); That would allow for some interesting situations. Its unlikely this will make 4.0 - but the solution interests me enough that if I get bored, I might just do it ;) Until that time I think you'll have to use some combination of a command/semaphore object and additional rules. Mark Maxime wrote: > Hello, > > I'm trying to find how to manage priority within a rule. Let me > explain the problem. I'll try to be as clear as possible but bear with > me since I am new to rules. > We have two objects, the Product is the object I'm trying to price and > the object Price is the one that knows all the prices. Both products > and prices have fields amount and length. Product amount is > initialized to 0 and prices are going to determine the product amount > depending on its length. > > Let's see an example : > > Product : P -> length = 5, amount = 0 > Price : P1 -> length = 1, amount = 50 > Price : P2 -> length = 3, amount = 100 > > With this configuration, after asserting the 3 objects to the WM, the > amount field of Product P should have a value of 200 ( 1*100 + 2*50) > because the price with the greatest length should be favored over the > other ones. > > Here is the rule I made : > > rule "Price Product rule using price length" > when > $s : Product (length > 0) > $price : Price($length: length) > then > $s.setAmount($s.getAmount() + $price.getAmount()); > $s.setLength($s.getLength() - $length.intValue()); > modify($s); > end > > This is obviously wrong because it always takes the first asserted > price object. I don't know how to make a rule which would take the > amount of the price object with the greatest length in priority. > > Any help would be very much appreciated. > > Cheers, > > Max > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users