[rules-users] Temporal rules in decision table

[Ioannis Christodoulou]

Amazing!
thanks a lot Wolfgang!

Kind regards

On Wed, Mar 12, 2014 at 10:27 AM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:

> You can create a rule with a timer to update Current with the required
> frequency.
>
> rule "set current"
>    timer (int: 1s 1s)
>    no-loop
> when
>    $c: Current()
> then
>    modify( $c ){ setXYZ(whatever) }
> end
>
>
>
> On 11/03/2014, Ioannis Christodoulou <io.christod at gmail.com> wrote:
> > Thanks a lot for the prompt reply and the detailed example!
> > It took me some time but I managed to convert it to a working xls
> decision
> > table.
> >
> > Now, I wanted to figure out how to automatically update the Current
> object
> > regularly, in order to re-calculate the rules over time.
> > My application is a java ee one. Would creating a @schedule on a
> singleton
> > method be a good solution, or is there another better advice for it?
> >
> > Thanks again!
> >
> > Ευχαριστώ πολύ,
> >    Ιωάννης Χριστοδούλου
> >
> >
> > On Tue, Mar 11, 2014 at 8:50 PM, Wolfgang Laun
> > <wolfgang.laun at gmail.com>wrote:
> >
> >> As you have Level with a field date, you can access that point in time
> in
> >> milliseconds, using getTimeInMillis(). For the current time, you might
> >> insert an object of class Current with a member now of class Calendar.
> >>
> >> rule closest
> >> when
> >>     Current( $now: now )
> >>     $level: Level( $value == 2, $date: date )
> >>     not $x: Level( Math.abs( $x.getDate().getTimeInMillis() -
> >> $now.getTimeInMillis() ) < Math.abs( $date.getTimeInMillis() -
> >> $now.getTimeInMillis() ) )
> >> then
> >>     // $level is the Level fact closest to Current with a level of 2
> >> end
> >>
> >> Untested. If the long expression gives you trouble, try enclosing it in
> >> eval(...).
> >> -W
> >>
> >>
> >> On 11 March 2014 18:14, JChrist <io.christod at gmail.com> wrote:
> >>
> >>> Hello everyone,
> >>> I was messing with drools v6.0.1.Final the past week and I have not
> been
> >>> able to completely understand how to integrate the rule engine to my
> >>> specification.
> >>>
> >>> For the needs of my project, I want to regularly insert some data in
> the
> >>> engine, similar to the following:
> >>> class Level { double value;Calendar date; }
> >>> this class contains some values at specific time points (both in the
> >>> past
> >>> and in the future).
> >>>
> >>> I would like to be able create a decision table based on the "current"
> >>> time
> >>> (plus or minus a variable offset) and the value of the closest Level to
> >>> that
> >>> time point.
> >>>
> >>> For example, assuming it is '2014-11-03 19:10:00' and the level objects
> >>> in
> >>> the session currently are:
> >>> '1.0 2014-11-03 18:00:00' and '2.0 2014-11-03 19:00:00',
> >>>
> >>> I would want a rule to say that if current level value is 2.0 then do
> >>> some
> >>> stuff and it would make a match.
> >>>
> >>> I would really appreciate any help on how to overcome this issue, as
> >>> well
> >>> as
> >>> any good examples/tutorials regarding this.
> >>>
> >>> Kind regards.
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> View this message in context:
> >>>
> http://drools.46999.n3.nabble.com/Temporal-rules-in-decision-table-tp4028638.html
> >>> Sent from the Drools: User forum mailing list archive at Nabble.com.
> >>> _______________________________________________
> >>> rules-users mailing list
> >>> rules-users at lists.jboss.org
> >>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>
> >>
> >>
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> >>
> >
>
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