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@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.




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