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## org.drools.planner.api.domain.variable.event
Interface PlanningVariableListener

All Superinterfaces:
  EventListener

    public interface PlanningVariableListener

extends EventListener

Method Summary
`void` | `afterChange(SolutionDirector solutionDirector, Object planningEntity, String variableName, Object oldValue, Object newValue)` Called after a variable value has been changed.

Method Detail

### afterChange

    void afterChange(SolutionDirector solutionDirector,
                     Object planningEntity,
                     String variableName,
                     Object oldValue,
                     Object newValue)

  Called after a variable value has been changed.

  Called from the solver thread. Should return fast, as it steals time from the Solver.

  Parameters:
    `solutionDirector` - never null
    `planningEntity` - never null
    `variableName` - never null
    `oldValue` - sometimes null
    `newValue` - sometimes null

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