# Package org.optaplanner.core.impl.domain.variable.listener.support

- Class Summary
  Class | Description
  --- | ---
  SmallScalingOrderedSet<E> | An ordered `Set` which is implemented as a `ArrayList` for a small `Set.size()` and a `LinkedHashSet` for a big `Set.size()`.
  VariableListenerNotifiable |
  VariableListenerNotification |
  VariableListenerSupport<Solution_> |

- Enum Summary
  Enum | Description
  --- | ---
  VariableListenerNotificationType |