[rules-users] DROOLS having RHS dynamic(5.0)

[Michal Bali]

Hi,

You could have a rule that will match on User as well as Data. This should
prevent regenerating drl files

rule rule1
  when
    $user:User( subscribedRules contains "rule1" )
    $data:Data(userId == $user.id)
    ... other conditions using $data.amount ...
  then
    //
end

Data is needed when a user wants to subscribe to one rule with different
values.

However if you don't foresee any complex logic. I don't think there is a
need for a rule engine.

Just my 2c.

Best Regards,
Michal


On Tue, Nov 4, 2008 at 10:08 PM, <shikha.x.aggarwal at jpmchase.com> wrote:

>
> Hi,
>
> I am looking to use drools where I can have users subscribed to specific
> alerts. Hence for example -
> I can have a rule like ->
> Rule 1 -> amount < {amount}
>
> Where {amount} is the value which the user defines at the time of
> subscribing, hence the user wants to recieve an alert when the amount in his
> account < {amount} that he just subscribed to.
>
> I was trying to use the DROOLS template feature and was even able to
> succesfully execute this specific scenario. The use case I was executing is,
> when an event of type Rule 1 occurs , I get all users who are subscribed to
> rule 1, and then create a drl file for all of those users with there custom
> data substituted as part of {amount}. Now I fire the rules(note I have
> multiple rules one for each user} which executes for this specific event and
> gives the required results(The above example is just a sample example). My
> area of concerns are -
>
> 1. Is Rule engine really the platform I am looking at? As I dont have any
> complex logic , I just want to use some component which can evaluate my
> Events that arrive with different subscription rules?
>
> 2. If I regenearte the drl file every time an event arrives (I need to
> because every time a iff type of rule can fire and the list of subscribers
> can be different as well), this would have a performace impact as the rules
> are compiled and generated every time and not really cached?
>
> Please let me know if the problem is not clear. Any help/inputs in this
> regard would be highly appreciated.
>
> Thanks
> Shikha
>
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