Package org.optaplanner.core.api.solver

Interface ProblemFactChange<Solution_>

Type Parameters:

Solution_ - the solution type, the class with the PlanningSolution annotation

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ProblemFactChange<Solution_>

A ProblemFactChange represents a change in 1 or more problem facts of a PlanningSolution. Problem facts used by a Solver must not be changed while it is solving, but by scheduling this command to the Solver, you can change them when the time is right.

Note that the Solver clones a PlanningSolution at will. So any change must be done on the problem facts and planning entities referenced by the PlanningSolution of the ScoreDirector. On each change it should also notify the ScoreDirector accordingly.

Method Summary

Modifier and Type	Method	Description
void	doChange(ScoreDirector<Solution_> scoreDirector)	Does the change on the PlanningSolution of the ScoreDirector and notifies the ScoreDirector accordingly.

Method Detail

doChange

void doChange(ScoreDirector<Solution_> scoreDirector)

Does the change on the PlanningSolution of the ScoreDirector and notifies the ScoreDirector accordingly. Every modification to the PlanningSolution, must be correctly notified to the ScoreDirector, otherwise the Score calculation will be corrupted.

Parameters:

scoreDirector - never null Contains the working solution which contains the problem facts (and planning entities) to change. Also needs to get notified of those changes.