Have you considered using Drools built in phase control instead of your own? Either agenda groups or a rule flow should do the trick and I neither of these options affect logical inserts.

On Sun, Feb 15, 2009 at 4:07 PM, Andreas Volz <andreas.volz@valtech.de> wrote:
Hi,

I have a question concerning the truth maintenance mechanism in Drools:
Is it possible to exclude some preconditions from truth maintenance?

We want to implement a rule flow by using an attribute of a special
fact (ProcessPhaseController.phase).
We have some phases that we want to traverse. In each phase only some
of our rules should be activated.
Therefore all of our rules test for a certain phase; e.g.:

when
  ProcessPhaseController(phase == ProcessPhase.EXEC)
...

When no rule of the current phase is activated, a special rule changes
the phase to the next one and the rules of the next phase are evaluated.

The problem now is that we have some rules with logical inserts. So
each time the phase is changed, all of these inserts are retracted.
To prevent this I would like to exclude the condition
"ProcessPhaseController(phase == ProcessPhase.EXEC)" from truth
maintenance. Is this possible?

Thanks in advance!

Cheers,
Andreas

--
Andreas Volz
Consultant
mailto:andreas.volz@valtech.de
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Valtech GmbH
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