Re: [rules-users] Long pattern for Nurse Rostering
See for comments inline.
On 09/08/2013, john poole <jdpoole(a)gmail.com> wrote:
I'm trying to create a rule for a 15 day pattern. When the
patterns uses
the
same shift for all 15 days, I do this:
rule "unWanted15DayPattern"
when
$pattern : U15DayPattern(
$numberOfDays : numberOfDays,
This binding is never used.
$shiftType : shiftType
)
ShiftAssignment(
shiftType == $shiftType,
$employee : employee,
$firstDayIndex : shiftDateDayIndex
The constraint shiftDateDayIndex % 15 == 0 should be used here.
(Principle: Avoid partial matches as early as possible.)
)
ShiftDate( $firstDayIndex == dayIndex, dayIndex % 15 == 0)
If the constraint is moved up: what is the purpose of this pattern? Is
it necessary to make sure that there *is* a ShiftDate with a matching
dayIndex? This won't work well, if there isn't, so I guess there
always is a matching ShiftDate - and then the pattern is now useless.
//Check for different employee working that shift in the next N days
$shiftAssignment : ShiftAssignment(
shiftType == $shiftType,
employee != $employee,
shiftDateDayIndex > $firstDayIndex,
shiftDateDayIndex < $firstDayIndex + 15
)
then
insertLogical(new IntConstraintOccurrence("unWanted15DayPattern",
ConstraintType.NEGATIVE_SOFT,
$pattern.getWeight(),
$firstDayIndex));
end
But I'm having a hard time figuring out how to do it with different
shiftTypes for each day, because it means having to use a loop.
Not necessarily. It depends how a U15DayPattern with more than one
shiftType in these days is represented. (Or what, exactly, do you mean
by "different shiftTypes for each day"?) A little more explanation
about the data model is indicated...
-W
Not sure if that makes sense, but it anyone has used a long pattern
that
stores items in a list/array I'd love to hear how they did it.
--
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http://drools.46999.n3.nabble.com/Long-pattern-for-Nurse-Rostering-tp4025...
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