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

- Interface Summary
  Interface | Description
  --- | ---
  AnchorVariableSupply | Only supported for chained variables.

- Class Summary
  Class | Description
  --- | ---
  AnchorShadowVariableDescriptor<Solution_> |
  AnchorVariableDemand |
  AnchorVariableListener<Solution_> |
  ExternalizedAnchorVariableSupply | Alternative to `AnchorVariableListener`.