Hey,
In Jess, is there any way to trigger a change to a single property
and have only those rules that reference the property be affected?
With property change listeners and dynamic shadow facts it appears
the entire shadow fact is updated and all rules referencing the
object are deactivated and reactivated. I had hoped that the
property change listener would *only* trigger updates to the
properties named (at least as a default behavior).
I can see the desire to have the whole bean updated when any property
changes (since some of the properties might be computed or virtual),
however there's a lot of value in not forcing all the de-/re-
activations that seem to follow (even if more careful consideration
of property updating might be necessary). If the whole bean is
affected on effectively any property change and all rules that
reference every bean have to re-evaluate -- regardless of the
particular property updating, then shadow facts have a much narrower
role than I'd hoped they could have.
Is there a way to change the behavior to only "tickle" the rules that
reference the properties being updated? Manual updates of static
shadow facts allow for control over updating, but are documented as
driving updates on all properties. My naive expectation was that
there was a way to have only the rules that reference properties
named in a change event result in an update. Is that a capability
available?
Any discussion of this is welcomed. I don't have a nice toy example
to present -- but if the issue isn't clear from this post, I suppose
I can contrive both a Java/Jess example and a corresponding COOL/
CLIPS example.
Thanks,
- Mike Smith
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