org.optaplanner.core.impl.solver.termination

## Class BasicPlumbingTermination

- 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.BasicPlumbingTermination

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

      public class BasicPlumbingTermination
      extends AbstractTermination

  Concurrency notes: Condition predicate on (`problemFactChangeQueue` is not empty or `terminatedEarly` is true).

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `daemon`
    `protected BlockingQueue<ProblemFactChange>` | `problemFactChangeQueue`
    `protected boolean` | `problemFactChangesBeingProcessed`
    `protected boolean` | `terminatedEarly`

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

      `logger`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `BasicPlumbingTermination(boolean daemon)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `<Solution_> boolean` | `addProblemFactChange(ProblemFactChange<Solution_> problemFactChange)` Concurrency note: unblocks `waitForRestartSolverDecision()`.
    `<Solution_> boolean` | `addProblemFactChanges(List<ProblemFactChange<Solution_>> problemFactChangeList)` Concurrency note: unblocks `waitForRestartSolverDecision()`.
    `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.
    `Termination` | `createChildThreadTermination(DefaultSolverScope solverScope, ChildThreadType childThreadType)` Create a `Termination` for a child `Thread` of the `Solver`.
    `void` | `endProblemFactChangesProcessing()`
    `boolean` | `isEveryProblemFactChangeProcessed()`
    `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.
    `boolean` | `isTerminateEarly()` This method is thread-safe.
    `void` | `resetTerminateEarly()` This method is thread-safe.
    `BlockingQueue<ProblemFactChange>` | `startProblemFactChangesProcessing()`
    `boolean` | `terminateEarly()` This method is thread-safe.
    `String` | `toString()`
    `boolean` | `waitForRestartSolverDecision()` If this returns true, then the problemFactChangeQueue is definitely not empty.

    - ### 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`

- - ### Field Detail

    - #### daemon

          protected final boolean daemon

    - #### terminatedEarly

          protected boolean terminatedEarly

    - #### problemFactChangeQueue

          protected BlockingQueue<ProblemFactChange> problemFactChangeQueue

    - #### problemFactChangesBeingProcessed

          protected boolean problemFactChangesBeingProcessed

  - ### Constructor Detail

    - #### BasicPlumbingTermination

          public BasicPlumbingTermination(boolean daemon)

  - ### Method Detail

    - #### resetTerminateEarly

          public void resetTerminateEarly()

      This method is thread-safe.

    - #### terminateEarly

          public boolean terminateEarly()

      This method is thread-safe.

      Concurrency note: unblocks `waitForRestartSolverDecision()`.

      Returns:
        true if successful

    - #### isTerminateEarly

          public boolean isTerminateEarly()

      This method is thread-safe.

    - #### waitForRestartSolverDecision

          public boolean waitForRestartSolverDecision()

      If this returns true, then the problemFactChangeQueue is definitely not empty.

      Concurrency note: Blocks until `problemFactChangeQueue` is not empty or `terminatedEarly` is true.

      Returns:
        true if the solver needs to be restarted

    - #### addProblemFactChange

          public <Solution_> boolean addProblemFactChange(ProblemFactChange<Solution_> problemFactChange)

      Concurrency note: unblocks `waitForRestartSolverDecision()`.
      Parameters:
        `problemFactChange` - never null
      Returns:
        as specified by `Collection.add(E)`

    - #### addProblemFactChanges

          public <Solution_> boolean addProblemFactChanges(List<ProblemFactChange<Solution_>> problemFactChangeList)

      Concurrency note: unblocks `waitForRestartSolverDecision()`.
      Parameters:
        `problemFactChangeList` - never null
      Returns:
        as specified by `Collection.add(E)`

    - #### startProblemFactChangesProcessing

          public BlockingQueue<ProblemFactChange> startProblemFactChangesProcessing()

    - #### endProblemFactChangesProcessing

          public void endProblemFactChangesProcessing()

    - #### isEveryProblemFactChangeProcessed

          public boolean isEveryProblemFactChangeProcessed()

    - #### 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.

    - #### 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 Termination 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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