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

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