[rules-users] Rule For Counting Planning Variables/Entities
I am new user of drools and I'm trying to recreate an application similar to
nurse rostering. This time assigning an employee to a department for a
specific period of time. My hard constraint was an employee must be assigned
to a department at least 3 months. My planning entity is
DepartmentAssignment and planning variable Employee. The planning entity
class looks like this:
@PlanningEntity(difficultyComparatorClass =
DepartmentAssignmentDifficultyComparator.class)
@XStreamAlias("DepartmentAssignment ")
public class DepartmentAssignment extends AbstractPersistable{
private Duration duration; // per month
private Department department;
//Planning variable : changes during planning, between score calculations.
private Employee employee;
How can I make such rule? I tried using this but it seems not working. Am i
missing something?
rule "minimumNumberofMonths"
when
$employee : Employee()
$department : Department()
$assignedNumberOfMonths : Number(intValue > 0 && < 3) from accumulate(
$assignment: DepartmentAssignment(
employee!= null,
department== $department,
employee== $employee
), count($assignment)
)
then
insertLogical(new IntConstraintOccurrence("minimumNumberofMonths",
ConstraintType.NEGATIVE_HARD,
1,
$employee, $department));
end
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