[rules-users] Can't obtain object from a FactHandle

[Wolfgang Laun]

Further investigation has shown me that, with the given LHS scenario,
   session.getFactHandle(Object obj)
is capable of giving me the correct fact handle value even for the
facts being passed through a "from".

This leads me to think that the useless FactHandle values returned by
getFactHandles() are due to a bug (and not so by design).

-W


On 02/03/2013, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
> Given a
>    org.drools.event.rule.BeforeActivationFiredEvent,
> method getActivation() returns a
>    org.drools.runtime.rule.Activation
> and its method getFactHandles() is documented to return a List<FactHandle>.
>
> It should be possible to retrieve the fact object using
> session.getObject( factHandle ), and this succeeds in many instances,
> but not reliably (5.5.0-Final).
>
> Given facts of types One and Two a rule like
>    One( $list: listOFTwos )
>    Two(...) from $list
> I find that Two facts, when matched via from, are not reported with
> the proper fact handle, i.e., the one returned from the insert.
>
> What's the point in reporting fact handles that can't be used to
> retrieve a fact object?
>
> If I want to obtain all facts that participate in an activation, is
> method Activation.getObjects() more (and fully) reliable?
>
> -W
>