[rules-users] executing ruleflow with AgendaFilter

[Michal Bali]

Hi Kris,

Thank you for quick response and explaining the details.

I thought that the AgendaFilter would cancel the activations and that the
ruleflow would continue. Otherwise it doesn't make much sense to use
AgendaFilter with ruleflow. But if it is not supported I'll have to live
with that :)

My use case: I have lot of rules. I need to be able to turn some rules on
and off depending on user input. I know that I could modify rule conditions
to check if a rule is enabled or not but this means lot of duplicated
conditions that are hard to maintain. I could also use 'rule inheritance'
but it doesn't provide enough flexibility - it supports only single
inheritance.

The problem is a crosscutting concern. It spreads across many rules. An
AgendaFilter seemed like the ideal candidate.
Alternatively, as you've indicated, I could use an AgendaEventListener and
in the activationCreated method cancel the activation. However this will
require use of some Drools internal APIs...

Thanks for your help.

Best regards,
Michal


On Mon, May 25, 2009 at 4:45 PM, Kris Verlaenen <
Kris.Verlaenen at cs.kuleuven.be> wrote:

> Michal,
>
> A ruleset node only continues if the ruleflow group is it associated
> with is deactivated.  A ruleflow group is deactivated automatically if
> it contains no more activations or if you deactivate it manually.  By
> using an agenda filter, you are not executing the activation and thus
> the activation is never removed from the ruleflow group.  Therefore, the
> process will keep waiting.  This is expected behavior.  Why were you
> expecting it to continue?  I guess you would need some other kind of
> "filter" that not prevents the activation from firing but cancels
> activations that are not accepted by the filter?
>
> Kris
>
> Quoting Michal Bali <michalbali at gmail.com>:
>
> > Hi,
> > If a rule is not allowed to fire by an AgendaFilter the whole
> > ruleflow
> > stops.
> >
> > I've created a small test case (attached). It contains:
> >  - one DRL file with one dummy rule that is in some ruleflow-group.
> >  - one RF file with three nodes ('start', 'ruleflow group' and
> > 'end')
> >  - a program that starts the process, and calls fireAllRules with
> > custom
> > agenda filter.
> >
> > Once the program is executed the ruleflow will stop inside the
> > ruleflow-group. If I remove the agenda filter it works as expected
> > (the
> > ruleflow finishes).
> >
> > Tested with Drools 5.0.1.
> >
> > Is this a bug or am I missing something?
> >
> > Best regards,
> > Michal
> >
>
>
>
>
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>
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