Feat: PlanningVariable Pinning

[StefanWolf-tp]

Is your feature request related to a problem? Please describe.
I have a situation where i can only change one planningvariable in my entity which has more planningvariable. this situation is new and it should be everything pinned except of one planningvariable. I looked up if there is something i can use and found an old feature request of optaplanner (https://issues.redhat.com/browse/PLANNER-124)

My current solution is, that i have a (similar) logic in my valueRangeProviders, which is returning only the set value except of the planning variable which should not be pinned.

Describe the solution you'd like
https://issues.redhat.com/browse/PLANNER-124

[triceo]

Hello @StefanWolf-tp! Thanks for reporting.

This is indeed a functionality gap - at the moment, I cannot promise if or when we'll get to closing it.

[StefanWolf-tp]

okay for documentation - in case the redhat link will not availible anymore.

Old title: Planning variable immovability (not just per entity): A planning variable can be immovable for Planner based on a SelectionFilter while another variable in the same entity is movable

Not simple, because:

• entities would need to be selected, but only in move selectors that actually change one of the pinned planning variables.
• moves selectors that change multiple variables must not change pinned planning variables

strawman napkin design:

@PlanningEntity
class Lesson {

   @PlanningPin(variable= {"room"})
   private boolean roomLocked;

    @PlanningVariable
    private Timeslot timeslot;
    @PlanningVariable
    private Room room;

}