On 2/13/07, Michael Suzio <msuzio@gmail.com> wrote:

The JBoss guys can correct me if I'm wrong, but although I think that works, what you've just done is eliminate any chance to precompute matches and trim down the checks that need to happen to find a rule match. Since the engine can't know that Helper.transform("value") returns a constant value, it has to re-run that every time and it has to reject for matches to the rule constraint every time.

I'm sure this would really sink performance, in other words. You can easily see the effect -- write the rule this way and time it, and then write it with the return value of Helper.transform being inlined, and I'm sure there's a big difference. It's the same as any other eval(...) situation in Drools; possible, but not good for performance.

On 2/12/07, Olenin, Vladimir (MOH) <Vladimir.Olenin@moh.gov.on.ca> wrote:
Hi,

I was wondering if calls to a Helper class are allowed in LHS of the rule?
Eg:

Rule myRule
When
MyObject(objField == Helper.transform("value"))
Then
// smth
End

Thanks,

Vlad
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