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## org.optaplanner.core.api.solver.event
Interface SolverEventListener<SolutionG extends Solution>

All Superinterfaces:
  EventListener

    public interface SolverEventListener<SolutionG extends Solution>

extends EventListener

Method Summary
`void` | `bestSolutionChanged(BestSolutionChangedEvent<SolutionG> event)` Called once every time when a better `Solution` is found.

Method Detail

### bestSolutionChanged

    void bestSolutionChanged(BestSolutionChangedEvent<SolutionG> event)

  Called once every time when a better `Solution` is found. The `Solution` is guaranteed to be initialized. Early in the solving process it's usually called more frequently than later on.

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

  In real-time planning If `Solver.addProblemFactChange(ProblemFactChange)` has been called once or more, all `ProblemFactChange`s in the queue will be processed and this method is called only once. In that case, the former best `Solution` is considered stale, so it doesn't matter whether the new `Score` is better than that or not.

  Parameters:
    `event` - never null

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