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

- Interface Summary
  Interface | Description
  --- | ---
  StatefulVariableListener<Entity_> | A stateful `VariableListener`, often used to externalize data for a `Supply` from the domain model itself.
  VariableListener<Entity_> | Changes shadow variables when a genuine planning variable changes.

- Class Summary
  Class | Description
  --- | ---
  VariableListenerAdapter<Entity_> |

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