[rules-users] First Order Logic - METHODS in Drools

[Wolfgang Laun]

It would help if you read the documentation which explains that eval() must
return a boolean.

"Predicate" is a mathematical concept; how it is implemented in some system
is a technical issue. That said, "predicates" can be expressed in Drools one
way or other, and some predicates may be more efficient than other,
depending
on the computational details.

Again, the documentation contains many examples showing "predicate"
implementations, and usage of "from" is documented as well.

-W


On 20 April 2011 10:48, Arjun Dhar <dhar_ar at yahoo.com> wrote:

> I believe eval() solves that purpose functionally but is not optimal; not
> sure how evals() tie in with Rete-OO
> Specially since the return type of eval() is not known, I can seriously
> doubt it being optimal as using Objects directly in conditions.
>
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