Check out the new "slot-specific" declaration for deftemplates; it
does exactly what you want.
See http://www.jessrules.com/docs/70/rules.html#slot-specific .
On Feb 8, 2007, at 11:39 PM, Michael Smith wrote:
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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