SolverEventListener (OptaPlanner Javadoc 8.15.0.Final API)

Type Parameters:

Solution_ - the solution type, the class with the PlanningSolution annotation

All Superinterfaces:

EventListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface SolverEventListener<Solution_>
extends EventListener
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`bestSolutionChanged(BestSolutionChangedEvent<Solution_> event)`	Called once every time when a better `PlanningSolution` is found.

- Method Detail
  - bestSolutionChanged
```
void bestSolutionChanged(BestSolutionChangedEvent<Solution_> event)
```
    Called once every time when a better PlanningSolution is found. The PlanningSolution 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 ProblemFactChanges in the queue will be processed and this method is called only once. In that case, the former best PlanningSolution is considered stale, so it doesn't matter whether the new Score is better than that or not.
    
    Parameters:
    
    event - never null