5:22 a.m.
Abhay,
Do you need a list?
You can assign RAM to COMPUTERS with this:-
when
$c : Computer( $type : type )
$r : RAM( compatibleWith == $type )
then
$c.addRAM( $r );
end
This would add all RAM (in Working Memory) compatible with COMPUTER to
computer.
You could use a list of RAM as a Fact in WM and change your rule to use
that:-
when
$l : MyList( )
$c : Computer( $type : type )
$r : RAM( compatibleWith == $type ) from $l
then
$c.addRAM( $r );
end
Or you can define a rule to construct the list too:-
when
$l : MyList( $t : typeRAM )
RAM( $c : $t )
then
$l.add( $r )
end
I assume you'd need to differentiate different lists for different types; so
I have shown use of "MyList" which could subclass ArrayList and have a
"Type
of RAM" attribute. Drools doesn't "do" generics.
With kind regards,
Mike
2011/5/9 Abhay B. Chaware <Abhay.Chaware(a)kpitcummins.com>
Wendy,
Thanks for helping me out so far.
I have another question. What if I have all my “RAM” objects inserted into
working memory. How should I write my rule’s “when” portion to get a
collection of all the RAM objects matching type “DDR” ? In other words, can
I get collection of facts assigned to a variable and use it in the “then”
part ?
Thanks
Abhay
==================================
*From:* rules-users-bounces(a)lists.jboss.org [mailto:
rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wendy Mungovan
*Sent:* Friday, May 06, 2011 5:47 PM
*To:* Rules Users List
*Subject:* Re: [rules-users] Basic rules question
Q2:
So the rule would be something like:
rule "RAM type"
when
$product: Product(type == "laptop");
then
//you are looking for the best way to set valid RAM types in the then
part of the rule?
$product.setRamType("DDR");
//or
$product.setValidRamOptions( getValidRamOptions("DDR"));
end
where getValidRamOptions would be a custom function included through
'import function' so you can then load the choices from some where else. Or
if RamOptions were an object in memory you could have a rule like:
rule "RAM type"
when
$product: Product(type == "laptop");
$ramOptions: RAMOptions(type == "DDR");
then
$product.setValidRamOptions( $ramOptions.getList());
end
Wendy
==================================
Regards,
Abhay Chaware
Sr. Designer | KPIT Cummins Infosystems Ltd | Board: +91 020 6652 5000 |
Extn: 2989 | abhay.chaware(a)kpitcummins.com |www.kpitcummins.com
P Please consider the environment before printing this e-mail
------------------------------
*From:* rules-users-bounces(a)lists.jboss.org [mailto:
rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wendy Mungovan
*Sent:* Friday, May 06, 2011 5:47 PM
*To:* Rules Users List
*Subject:* Re: [rules-users] Basic rules question
Abhay,
Q1: I think that this will depend on how many different products you
have. If there is a small number it is more straight forward to have a rule
for each one (so the 2nd option). This allows all you logic to be in one
place. If there are a large number of products and writing a rule for each
one is intractable you probably would want to look into some generalizations
of the rules. Is that helpful?
Q2: I'm not quite sure what you are getting at in Q2. Are you trying to
write validation rules or rules that are modifying the facts?
Wendy
------------------------------
*From:* Abhay B. Chaware <Abhay.Chaware(a)kpitcummins.com>
*To:* "rules-users(a)lists.jboss.org" <rules-users(a)lists.jboss.org>
*Sent:* Fri, May 6, 2011 4:59:46 AM
*Subject:* [rules-users] Basic rules question
Hi
I am a newbie to rule based applications and trying to get the concept of
rules. I have couple of questions about rules to start with, not
specifically about Drools though.
Q1 - Should rules be data/model specific or can/should they be generic or
both
==========================================================
e.g.
If selected product “TYPE” is “laptop”, then category “RAM” should have all
“DDR” type items compatible ( selecting items matching certain property )
OR
If selected product is “IBM T42”, then category “RAM” should have “512MB
DDR” , “1024MB DDR”, “2048MB DDR” compatible. ( assigning individual items
in rules )
OR
Combination of both
Q2 – How should be the data modeled in above case
==========================================================
e.g.
in product master, each item ( e.g. T40, T42 ) should have a “TYPE” ( e.g.
desktop or laptop ) , all items in category “RAM” should have a “TYPE” (
e.g. DDR ) and then control the assignment of RAM options to the PRODUCT
through Rule using “DDR” type ?
OR
in product master, each item ( e.g. T40, T42 ) should have a “TYPE” ( e.g.
desktop or laptop ) , all items in category “RAM” should have a
“compatibleProduct” column ( e.g. desktop or laptop ) and control the
assignment of RAM to PRODUCT through “dynamic” rules by selecting all the
RAMs by passing the “TYPE” of the product to the database handler.
Am I making my point clear ?
Thanks
Abhay
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