Re: [rules-users] modifying the problem facts while running the solver - Drools Planner
spinjala wrote
I am new to Drools planner. I have one issue and wanted to understand how
to resolve it best.
I am trying to use planner to optimize the scheduling of work orders to
resources. I have certain resources that need to be assigned to a work
order in a way that maximizes the utilization of the resource. But I have
a condition where once a resource is scheduled for a workorder, he/she
shouldn't be scheduled for any other work order again during the same day.
How do we manage this condition? do we add it as a constraint in the
drools rule file so that scoring can handle it or do we write a custom
solver phase to check if a solution has this resource assigned to a WO,
then skip the resource and proceed with further solution. Please help.
See nurseRosteringScoreRules.drl:
// a nurse can only work one shift per day, i.e. no two shift can be
assigned to the same nurse on a day.
rule "oneShiftPerDay"
when
$leftAssignment : ShiftAssignment($leftId : id, $employee :
employee, $shiftDate : shiftDate)
$rightAssignment : ShiftAssignment(employee == $employee, shiftDate
== $shiftDate, id > $leftId)
then
insertLogical(new IntConstraintOccurrence("oneShiftPerDay",
ConstraintType.NEGATIVE_HARD,
1,
$leftAssignment, $rightAssignment));
end
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