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## org.optaplanner.core.api.solver
Interface Solver

All Known Implementing Classes:
  DefaultSolver

    public interface Solver

A Solver solves planning problems.

Most methods are not thread-safe and should be called from the same thread.

Method Summary
`void` | `addEventListener(SolverEventListener eventListener)`
`boolean` | `addProblemFactChange(ProblemFactChange problemFactChange)` Schedules a `ProblemFactChange` to be processed.
`Solution` | `getBestSolution()`
`ScoreDirectorFactory` | `getScoreDirectorFactory()`
`long` | `getTimeMillisSpend()` TODO timeMillisSpend should not continue to increase after the solver has been terminated
`boolean` | `isEveryProblemFactChangeProcessed()` Checks if all scheduled `ProblemFactChange`s have been processed.
`boolean` | `isSolving()` This method is thread-safe.
`boolean` | `isTerminateEarly()` This method is thread-safe.
`void` | `removeEventListener(SolverEventListener eventListener)`
`void` | `setPlanningProblem(Solution planningProblem)`
`void` | `solve()` Solves the planning problem.
`boolean` | `terminateEarly()` Notifies the solver that it should stop at its earliest convenience.

Method Detail

### setPlanningProblem

    void setPlanningProblem(Solution planningProblem)

  Parameters:
    `planningProblem` - never null

### getBestSolution

    Solution getBestSolution()

  Returns:
    never null, but it can return the original, uninitialized `Solution` with a `Score` null.

### getTimeMillisSpend

    long getTimeMillisSpend()

  TODO timeMillisSpend should not continue to increase after the solver has been terminated

  Returns:
    the amount of millis spend since this solver started

### solve

    void solve()

  Solves the planning problem. It can take minutes, even hours or days before this method returns, depending on the termination configuration. To terminate a `Solver` early, call `terminateEarly()`.

  See Also:
    `terminateEarly()`

### isSolving

    boolean isSolving()

  This method is thread-safe.

  Returns:
    true if the `solve()` method is still running.

### terminateEarly

    boolean terminateEarly()

  Notifies the solver that it should stop at its earliest convenience. This method returns immediately, but it takes an undetermined time for the `solve()` to actually return.

  This method is thread-safe.

  Returns:
    true if successful
  See Also:
    `isTerminateEarly()`, `Future.cancel(boolean)`

### isTerminateEarly

    boolean isTerminateEarly()

  This method is thread-safe.

  Returns:
    true if terminateEarly has been called since the started.
  See Also:
    `Future.isCancelled()`

### addProblemFactChange

    boolean addProblemFactChange(ProblemFactChange problemFactChange)

  Schedules a `ProblemFactChange` to be processed.

  As a side-effect, this restarts the `Solver`, effectively resetting all `Termination`s, but not `terminateEarly()`.

  This method is thread-safe. Follows specifications of `BlockingQueue.add(Object)` with by default a capacity of `Integer.MAX_VALUE`.

  Parameters:
    `problemFactChange` - never null
  Returns:
    true (as specified by `Collection.add(E)`)

### isEveryProblemFactChangeProcessed

    boolean isEveryProblemFactChangeProcessed()

  Checks if all scheduled `ProblemFactChange`s have been processed.

  This method is thread-safe.

  Returns:
    true if there are no `ProblemFactChange`s left to do

### addEventListener

    void addEventListener(SolverEventListener eventListener)

  Parameters:
    `eventListener` - never null

### removeEventListener

    void removeEventListener(SolverEventListener eventListener)

  Parameters:
    `eventListener` - never null

### getScoreDirectorFactory

    ScoreDirectorFactory getScoreDirectorFactory()

  Returns:
    never null

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