[rules-users] Multiple packages approach

[Torfox]

Hi Ross,

Thank your for your response. 

Here is a wider context of my application. I'm implementing insurance
premium comparison system. So the system applies the same fact (customer
information) to many sets of rules. Every set of rules represents a single
insurance product. The result of execution of every rule set is an object
describing premium value and some calculation logs. By clearing the context
I re-initiation of this resulting object in WorkingMemory, before the next
set of rules is activated. I don't know yet if that kind of action is
possible  in drools - does drools execute rules package after package? I
haven't found yet an explanation of package role in the rule execution
process.

Bye,
Bartosz


Ross H wrote:
> 
> Hi Bartosz,
> 
> I think the answer is "it depends", and that is in the context of the
> application you are trying to develop. I don't quite understand your
> statement about clearing the calculation context when the session is
> stateless.
> 
> Whichever approach, I would wrap it as a pricing service with business
> methods, and then under the covers you can use whatever strategy you like
> and change that without impacting your application.
> 
> I'm also not sure if you are asking from a perspective of performance, so
> is
> it better to have number of smaller KnowledgeBases or one large one from a
> memory/response aspect, and that depends on the number of rules,
> complexity
> of conditions, and of course your fact model.
> 
> On the other hand if you want to manage the lifecycle of your products
> independently (say the pricing rules change frequently), and as you say
> the
> rulesets are independent, then it might be better to have separate
> KnowledgeBases from a management perspective. How do you deploy the rules,
> embedded, Rule Agent, BRMS ...
> 
> Maybe some more info on your solution space would help others to give you
> a
> better response.
> 
> Regards Ross
> 
> On Sun, Dec 6, 2009 at 7:43 PM, Torfox <bartosz.jankiewicz at gmail.com>
> wrote:
> 
>>
>> Hi,
>>
>> I'm trying to achieve the following result. There are many rule sets,
>> every
>> set is responsible for insurance premium calculation and these sets are
>> independent (every set applies to a single product). I have organized the
>> rules into packages, where package identifies product.
>> After calculation of every rule set I have a resulting object insurance
>> premium and calculation log.
>>
>> What is the best pattern to execute those rules. E.g. can I put all
>> packages
>> into a single KnowledgeBase and execute StatelessKnowledgeSession
>> providing
>> that the last rule of every rule set clears the calculation context?
>> Or is it better to create separate KnowledgeBase for every single
>> product?
>>
>> Thanks for the hints.
>>
>> Bartosz
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