[rules-users] New project is Drools Engine suitable for it ?

[Corneil du Plessis]

You have to consider the number of users and the frequency of rule changes.

The persistent rules are combined at runtime into a ruleset used by the 
engine. Multiple sessions can be executed from a ruleset.

If the User-specific rules are added to a the global rules in such a way 
that the criteria identifying the User is part of the matching criteria 
for the rule you could have a single ruleset for all users.

There is an overhead to the initialization of rules which means that if 
performance is important you would do better to maintain a single 
ruleset at runtime.
If the ruleset is invalidated frequently by changes to rules then it 
would be better to maintain a ruleset per User and build the ruleset on 
demand and cache the ruleset.

On 2010-10-26 11:36, Gregory Czerwinski wrote:
> Question about Drools usage ?
>
>
> Hello All.
>
> I have question about using Drools in my new project. I have this kind of
> scenario to fufill with rules engine.
>
> Scenarios.
>
> Each user  has  it own set of rules that determine if he should be notified
> about event,
> and those are fully editable by system administrators.
> There are also global rules indicating that User should be notified – common
> for all users.
>
> My question is how to use Drools engine in this concert situation, as it is
> not global set of rules that can be putted once in to engine, but set of
> changing per User rules ?
>
> Thanks for help : )
>