[rules-users] Fetching values of an object's attribute set bydifferent rules

[Kris Nuttycombe]

StatelessSession.executeWithResults() was what I had in mind when I
suggested obtaining the newly asserted facts from the working memory
using a query. In my application, I assert a new fact accumulator when
appropriate from within the rules themselves, and then have a simple
query that looks like this:

query "findAccumulator"
    result : Accumulator()
end

Then I use something like this to get my accumulator back:

StatelessSessionResult results = session.executeWithResults(new Object[] {...});
QueryResults queryResults = results.getQueryResults("findAccumulator");
Accumulator acc = (Accumulator) QueryResults.get(0).get("result");

Kris

On Tue, Aug 12, 2008 at 3:42 AM, Anstis, Michael (M.) <manstis1 at ford.com> wrote:
> OK, so here is my take on things:-
>
> +--------------+   +----------------+   +-------------------+
> |              |   |                |   |                   |
> | Sub-system 1 |-->| Sub-system 2   |-->| Sub-system 3 uses |
> | sets up data |   | Rules \ Drools |   | results from sub- |
> +--------------+   |                |   | system 2          |
>                   +----------------+   +-------------------+
>
>
> I would be inclined to have List<WashRuleValueHolder > as a global in WM
> and append instances of WashRuleValueHolder to the list in RHS of rules
> (or a Map or something so you can retrieve what you want easily). Also
> have you looked at StatelessSession.executeWithResults() - which I
> haven't personally used but would give you what (I think) you need (if
> stateless is acceptable too!).
>
> Cheers,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of psentosa
> Sent: 12 August 2008 09:45
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] Fetching values of an object's attribute set
> bydifferent rules
>
>
> Thank you Mike and Kris for the answer.
> So I'll give it a try again to explain :)
>
> The rules I described have information that I need to go further with my
> application,
> i.e. with the wash example, when rule A fires, it'll give information
> about
> the washing instruction regarding the temperature and detergent.
> Now, let's say, I have another block of codes apart from this RE-part,
> which
> needs those information (.e.g a WashMachine Object). These info should
> only
> be defined within the rules. So my question before was, how can I pass
> those
> to my washMachine?
> That's why idea was to insert a new/empty value holder, set the value to
> the
> holder when the rule fire, and I can use the value holder (which already
> contains value/has info from the fired rules).
> I'm not sure if using such a ValueHolder is the best way to fetch some
> values set within the rules.
> I hope this is clearer now, and any idea would be great!
> Thanks in advance
>
> Paul
>
>
>
>
>
> psentosa wrote:
>>
>> Hi,
>>
>> I have the following problems:
>> I need to prove an object based on certain rules, where the parts of
> the
>> rules should be kept to be used in further process within my
> application.
>> In order to fetch those parts, my idea was to insert an additional
> object
>> as value holder for the rule's parts,
>> put values on them when the corresponding rule is fired, so that later
> on
>> I can process those value holder after my appl gets the control back
> from
>> Ruleengine.
>>
>>
>> The example below:
>>
>> Shirt shirt = new Shirt(...)
>> WashRuleValueHolder holder = new WashRuleValueHolder();
>>
>> session.insert(shirt);
>> session.insert(holder);
>> ......
>>
>> session.dispose()
>>
>> System.out.println(holder.getTemperature());
>> System.out.println(holder.getDetergent());
>> =======================
>>
>> rule A
>> when
>>       Shirt (dirtinessLevel == high)
>>       $holder : WashRuleValueHolder()
>> then
>>       System.out.println ("this cloth should be washed in 60 degree
> water
>> with 1 spoon of detergent")
>>      $holder.temperature = 60;
>>      $holder.detergent = 1;
>>
>> rule B
>> when
>>      Shirt(material == satin)
>>      $holder : WashRuleValueHolder()
>> then
>>        System.out.println ("this cloth should be washed in 30 degree
> water
>> with 0,5 spoon of detergent")
>>      $holder.temperature = 30;
>>      $holder.detergent = 0,5;
>>
>> Now, in case both rules evaluate to true, I'd have problem with my
>> valueholder, bcs depending on which one of the rules was fired latest,
>> that'd be the value I got from the holder, and I need both of them.
>> So, my questions:
>>
>> - Is using such a value holder a good solution to fetch the rules'
> value?
>> Or is there any better solution?
>> - How to handle this problem of multiple value association to the
> holder,
>> so I still can get all the values without one overwriting the other
> and
>> they are still connected?
>>
>> Any idea highly appreciated, thanks in advance!
>>
>>
>>
>>
>
> --
> View this message in context:
> http://www.nabble.com/Fetching-values-of-an-object%27s-attribute-set-by-
> different-rules-tp18922201p18940166.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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