org.optaplanner.core.impl.solver.termination

## Class UnimprovedStepCountTermination

- java.lang.Object
- - org.optaplanner.core.impl.solver.event.SolverLifecycleListenerAdapter<Solution_>
  - - org.optaplanner.core.impl.phase.event.PhaseLifecycleListenerAdapter
    - - org.optaplanner.core.impl.solver.termination.AbstractTermination
      - - org.optaplanner.core.impl.solver.termination.UnimprovedStepCountTermination

- All Implemented Interfaces:
    EventListener, PhaseLifecycleListener, SolverLifecycleListener, Termination

      public class UnimprovedStepCountTermination
      extends AbstractTermination

- - ### Field Summary

    - ### Fields inherited from class org.optaplanner.core.impl.solver.termination.AbstractTermination

      `logger`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `UnimprovedStepCountTermination(int unimprovedStepCountLimit)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `double` | `calculatePhaseTimeGradient(AbstractPhaseScope phaseScope)` See `Termination.calculateSolverTimeGradient(DefaultSolverScope)`.
    `double` | `calculateSolverTimeGradient(DefaultSolverScope solverScope)` A timeGradient is a relative estimate of how long the search will continue.
    `protected int` | `calculateUnimprovedStepCount(AbstractPhaseScope phaseScope)`
    `UnimprovedStepCountTermination` | `createChildThreadTermination(DefaultSolverScope solverScope, ChildThreadType childThreadType)` Create a `Termination` for a child `Thread` of the `Solver`.
    `int` | `getUnimprovedStepCountLimit()`
    `boolean` | `isPhaseTerminated(AbstractPhaseScope phaseScope)` Called by the `Phase` after every step and every move to determine if the search should stop.
    `boolean` | `isSolverTerminated(DefaultSolverScope solverScope)` Called by the `Solver` after every phase to determine if the search should stop.
    `String` | `toString()`

    - ### Methods inherited from class org.optaplanner.core.impl.phase.event.PhaseLifecycleListenerAdapter

      `phaseEnded, phaseStarted, stepEnded, stepStarted`

    - ### Methods inherited from class org.optaplanner.core.impl.solver.event.SolverLifecycleListenerAdapter

      `solvingEnded, solvingStarted`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.optaplanner.core.impl.phase.event.PhaseLifecycleListener

      `phaseEnded, phaseStarted, stepEnded, stepStarted`

    - ### Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener

      `solvingEnded, solvingStarted`

- - ### Constructor Detail

    - #### UnimprovedStepCountTermination

          public UnimprovedStepCountTermination(int unimprovedStepCountLimit)

  - ### Method Detail

    - #### getUnimprovedStepCountLimit

          public int getUnimprovedStepCountLimit()

    - #### isSolverTerminated

          public boolean isSolverTerminated(DefaultSolverScope solverScope)

      Description copied from interface: `Termination`
      Called by the `Solver` after every phase to determine if the search should stop.
      Parameters:
        `solverScope` - never null
      Returns:
        true if the search should terminate.

    - #### isPhaseTerminated

          public boolean isPhaseTerminated(AbstractPhaseScope phaseScope)

      Description copied from interface: `Termination`
      Called by the `Phase` after every step and every move to determine if the search should stop.
      Parameters:
        `phaseScope` - never null
      Returns:
        true if the search should terminate.

    - #### calculateUnimprovedStepCount

          protected int calculateUnimprovedStepCount(AbstractPhaseScope phaseScope)

    - #### calculateSolverTimeGradient

          public double calculateSolverTimeGradient(DefaultSolverScope solverScope)

      Description copied from interface: `Termination`
      A timeGradient is a relative estimate of how long the search will continue.

      Clients that use a timeGradient should cache it at the start of a single step because some implementations are not time-stable.

      If a timeGradient can not be calculated, it should return -1.0. Several implementations (such a `SimulatedAnnealingAcceptor`) require a correctly implemented timeGradient.

      A Termination's timeGradient can be requested after they are terminated, so implementations should be careful not to return a timeGradient above 1.0.

      Parameters:
        `solverScope` - never null
      Returns:
        timeGradient t for which `0.0 <= t <= 1.0 or -1.0` when it is not supported. At the start of a solver t is 0.0 and at the end t would be 1.0.

    - #### calculatePhaseTimeGradient

          public double calculatePhaseTimeGradient(AbstractPhaseScope phaseScope)

      Description copied from interface: `Termination`
      See `Termination.calculateSolverTimeGradient(DefaultSolverScope)`.
      Parameters:
        `phaseScope` - never null
      Returns:
        timeGradient t for which `0.0 <= t <= 1.0 or -1.0` when it is not supported. At the start of a phase t is 0.0 and at the end t would be 1.0.

    - #### createChildThreadTermination

          public UnimprovedStepCountTermination createChildThreadTermination(DefaultSolverScope solverScope,
                                                                             ChildThreadType childThreadType)

      Description copied from interface: `Termination`
      Create a `Termination` for a child `Thread` of the `Solver`.
      Specified by:
        `createChildThreadTermination` in interface `Termination`
      Overrides:
        `createChildThreadTermination` in class `AbstractTermination`
      Parameters:
        `solverScope` - never null
        `childThreadType` - never null
      Returns:
        not null

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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