[rules-users] modifying the problem facts while running the solver - Drools Planner

[ge0ffrey]

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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