[rules-users] How to use KnowledgeBase

[FrankVhh]

Hi,

In theory, you can do it both ways. Depending on your situation, you will
have to assess which approach will be the best solution.

Regarding the fact that creation of a kbase takes some time, you will
probably want to avoid doing it multiple times per transaction or, at least,
cache them. Also, when your rules are part of a continupus flow, you
probably want only 1 kbase.

In your situation, mortgages, I assume your rules are following eachother
with no or very little interaction from the user. In that case, I think one
would normally use 1 knowledgebase.

Theoretically, multiple knowledgebases should be used when dealing with
completely different rulesets, with one ruleset not influencing the other
(or execution of ruleset one happening in a totally different timeframe as
to justify the use of another kbase).

I hope this makes it clear.

Regards,
Frank


ismaximum wrote:
> 
> Hi
> 
> I am new to Drools and just want to start developing our app with Drools.
> I have some questions regarding KnowledgeBase instantiation. 
> 
> Can we create a single instance of KB across the application and use it to
> create any stateful or stateless session? 
> In this case, do we need to add all the rules available in our application
> or we need to create one instance for each set of rules? In other words,
> consider we have many rules including mortgage calculation/ validation,
> auditing process, interest rate calculation and many others, do we need to
> create one instance of KB for each rule or just one KB and add all the
> rules to it?
> 


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