9:31 a.m.
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
9:48 a.m.
New subject: RE : How to handle priority in a rule
you can affect a numero to salience in fact salience is used to give a priority to rule
and the rule who has the numero of salience more priority
rule "Price Product rule using price length"
salience 500 ( for exemple )
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
Maxime <mcatelin(a)perinfo.com> a écrit : 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
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Questions/Réponses.
10:04 a.m.
New subject: RE : How to handle priority in a rule
Thanks for your reply but this does not do what I want to do because I
don't want to put more priority to a rule over another one, I want this
rule to fire with the price object that has the highest length field,
considering there are more than one Price objects in the WM.
Any other ideas?? Am I trying something impossible or should I take
another approach?
fakhfakh ismail a écrit :
you can affect a numero to salience in fact salience is used to give
a priority to rule and the rule who has the numero of salience more
priority
rule "Price Product rule using price length"
salience 500 ( for exemple )
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
*/Maxime <mcatelin(a)perinfo.com>/* a écrit :
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
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2:26 a.m.
New subject: RE : How to handle priority in a rule
I didn't get a chance to reply to your messages before.
Yes, Mark. What I was trying to do is dynamic prioritisation based upon
the value of a field because the objects are stored and retrieved from a
database.
I'm glad to see that it interested you and that it may be implemented
later. However Edson showed me a good way around this problem and I
thank him very for that because this is exactly what I was looking for
and it seems to be working very good.
All the best,
Max
10:36 a.m.
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
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rules-users mailing list
rules-users(a)lists.jboss.org
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noon
This is what in Portuguese we call a "tempest in a glass of water"...
:)
In fact, the problem is simple once you think about how write a
constraint to give you the largest Price. Using the "not" CE will help you
on this matter:
rule "Price Product rule using price length"
when
$s : Product ( $productLength : length > 0)
$price : Price( $priceLength : length <= $productLength )
not Price( length > $priceLength, length <= $productLength )
then
$s.setAmount($s.getAmount() + $price.getAmount());
$s.setLength($s.getLength() - $priceLength.intValue());
modify($s);
end
So the above rule is saying: match a Product with a Price, in a way that
does NOT exist another Price whose length is greater than the matched Price,
but still less or equal to the Product length. In other words, match a
Product with the Price with the greatest length but still less or equal to
the Product length.
Hope it helps.
Regards,
Edson
2007/5/11, Mark Proctor <mproctor(a)codehaus.org>:
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
>
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
6437
days inactive
6440
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5 comments
4 participants
participants (4)
-
Edson Tirelli -
fakhfakh ismail -
Mark Proctor -
Maxime