net.openhft.chronicle.threads

Enum BusyPauser

java.lang.Object

java.lang.Enum<BusyPauser>

net.openhft.chronicle.threads.BusyPauser

All Implemented Interfaces:

Serializable, Comparable<BusyPauser>, Pauser

public enum BusyPauser
extends Enum<BusyPauser>
implements Pauser

Implementation of Pauser that employs a busy-wait strategy to keep the CPU actively engaged. This pauser continuously executes a very short pause (nano-pause) to keep the thread active.

Because it never actually suspends the thread, most operations related to state management (like pausing, unpausing, and timeout handling) are unsupported or no-op.

Nested Class Summary

Nested classes/interfaces inherited from interface net.openhft.chronicle.threads.Pauser

Pauser.SleepyWarning

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE

Field Summary

Fields inherited from interface net.openhft.chronicle.threads.Pauser

BALANCED, MIN_BUSY, MIN_PROCESSORS, SLEEPY

Method Summary

Modifier and Type	Method and Description
long	countPaused() Always returns 0 as BusyPauser does not count pauses.
boolean	isBusy() Always returns true, indicating that this pauser keeps the thread busy rather than truly pausing it.
void	pause() Keeps the thread actively busy by executing a very short pause at the CPU level.
void	pause(long timeout, TimeUnit timeUnit) Throws UnsupportedOperationException as BusyPauser does not support pausing with a timeout.
void	reset() Does nothing as BusyPauser does not maintain state that requires resetting.
long	timePaused() Always returns 0 as BusyPauser does not track paused time.
String	toString() Provides a string representation of this pauser, identifying it as "PauserMode.busy".
void	unpause() Does nothing as BusyPauser has no pausing state to unpause from.
static BusyPauser	valueOf(String name) Returns the enum constant of this type with the specified name.
static BusyPauser[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.openhft.chronicle.threads.Pauser

asyncPause, asyncPausing, balanced, balancedUpToMillis, busy, getBalanced, getSleepy, millis, millis, sleepy, timedBusy, yielding, yielding

Enum Constant Detail

INSTANCE

public static final BusyPauser INSTANCE

Method Detail

values

public static BusyPauser[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (BusyPauser c : BusyPauser.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static BusyPauser valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

reset

public void reset()

Does nothing as BusyPauser does not maintain state that requires resetting.

Specified by:

reset in interface Pauser

pause

public void pause()

Keeps the thread actively busy by executing a very short pause at the CPU level. This method is primarily used to prevent the thread from yielding execution entirely.

Specified by:

pause in interface Pauser

pause

public void pause(long timeout,
                  TimeUnit timeUnit)
           throws TimeoutException

Throws UnsupportedOperationException as BusyPauser does not support pausing with a timeout.

Specified by:

pause in interface Pauser

Parameters:

timeout - the timeout duration

timeUnit - the unit of time for the timeout duration

Throws:

TimeoutException - never thrown

unpause

public void unpause()

Does nothing as BusyPauser has no pausing state to unpause from.

Specified by:

unpause in interface Pauser

timePaused

public long timePaused()

Always returns 0 as BusyPauser does not track paused time.

Specified by:

timePaused in interface Pauser

Returns:

0 always

countPaused

public long countPaused()

Always returns 0 as BusyPauser does not count pauses.

Specified by:

countPaused in interface Pauser

Returns:

0 always

isBusy

public boolean isBusy()

Always returns true, indicating that this pauser keeps the thread busy rather than truly pausing it.

Specified by:

isBusy in interface Pauser

Returns:

true always

toString

public String toString()

Provides a string representation of this pauser, identifying it as "PauserMode.busy".

Overrides:

toString in class Enum<BusyPauser>

Returns:

the string "PauserMode.busy"