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## org.optaplanner.core.impl.domain.variable.listener
Interface VariableListener<EntityG>

All Known Implementing Classes:
  ArrivalTimeUpdatingVariableListener, InverseRelationVariableListener, PeriodUpdatingVariableListener, PredecessorsDoneDateUpdatingVariableListener, VehicleUpdatingVariableListener

    public interface VariableListener<EntityG>

Changes shadow variables when a genuine planning variable changes.

Important: it must only change the shadow variable for which it's configured! It should never change a genuine variable or a problem fact. It can change its shadow variable on multiple entity instances (for example: an arrivalTime change affects all trailing entities too)

Method Summary
`void` | `afterEntityAdded(ScoreDirector scoreDirector, EntityG entity)`
`void` | `afterEntityRemoved(ScoreDirector scoreDirector, EntityG entity)`
`void` | `afterVariableChanged(ScoreDirector scoreDirector, EntityG entity)`
`void` | `beforeEntityAdded(ScoreDirector scoreDirector, EntityG entity)`
`void` | `beforeEntityRemoved(ScoreDirector scoreDirector, EntityG entity)`
`void` | `beforeVariableChanged(ScoreDirector scoreDirector, EntityG entity)`

Method Detail

### beforeEntityAdded

    void beforeEntityAdded(ScoreDirector scoreDirector,
                           EntityG entity)

### afterEntityAdded

    void afterEntityAdded(ScoreDirector scoreDirector,
                          EntityG entity)

### beforeVariableChanged

    void beforeVariableChanged(ScoreDirector scoreDirector,
                               EntityG entity)

### afterVariableChanged

    void afterVariableChanged(ScoreDirector scoreDirector,
                              EntityG entity)

### beforeEntityRemoved

    void beforeEntityRemoved(ScoreDirector scoreDirector,
                             EntityG entity)

### afterEntityRemoved

    void afterEntityRemoved(ScoreDirector scoreDirector,
                            EntityG entity)

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