Re: [rules-users] Temporal rules in decision table
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(a)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-tp4028...
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