[rules-users] some pointers for solution

[Wishing Carebear]

Thanks Greg\Barton. I will try it out and get back to you.

Regards,
cabear

2009/11/8 Wolfgang Laun <wolfgang.laun at gmail.com>

> Another proposal, with perhaps more emphasize on "rulishness".
>
> Given
>    class Item  { T1 s1;... Tn sn;... }
> let's add
>    enum Criterium { C1, C2,... Cn; }
>    class Request { EnumSet<Criterium> criteria; HashSet<Item> results; }
>
> To launch a request, insert a Request object with an appropriate setting
> for criteria. Then, match all Item facts against rules, one for each Ci:
>
> rule "Check C1"
> when
>     $request : Request( criteria contains Criterium.C1 )
>     $item : Item( s1 <op> <value> )     # the constraint defining "valid"
> then
>     $request.getResults().add( $item );   # no modify!
> end
>
> //...same for C2 ... Cn
>
> rule "Return results"
> salience -100
> when
>     $request : Request()
> then
>     ... send $request.getResults() back to User
>     retract( $request );
> end
>
> You could have two rules here, one testing for success (getResults().size()
> == getCriteria().size()), the other one firing for failure, but it might be
> preferable to handle it in the presentation layer.
>
> Although I've used similar approaches, the code here is just off the cuff.
> -W
>
> 2009/11/8 Wishing Carebear <wishing.carebear at gmail.com>
>
>>   Hello:
>> There are n selection criteria from s1 .. sn for each item i1.. in. Each
>> item can have a subset of criteria which applies to them.
>>
>> The end user, can choose a subset of criteria like c1 and c5 and only the
>> item that has c1 and c5 valid should be returned. For example: if item i1
>> and i2 have criterias valid for c1, c2, c5, c6, c8 since the request is only
>> for criteria c1 and c5, i1 and i2 must be returned.
>>
>> Is it possible to write a rule using drools for this requirement.
>>
>> Thanks for your help and time,
>> cabear
>>
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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
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