Package org.forgerock.openam.shared.concurrency

Class ResizableSemaphore

java.lang.Object

java.util.concurrent.Semaphore

org.forgerock.openam.shared.concurrency.ResizableSemaphore

All Implemented Interfaces:

Serializable

public class ResizableSemaphore
extends Semaphore

A Semaphore implementation which performs exactly as a standard Semaphore, but supports 'resizing' of the Semaphore too.

Since:

13.0.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ResizableSemaphore(int permits)	Creates a ResizableSemaphore with the given number of permits and nonfair fairness setting.
ResizableSemaphore(int permits, boolean fair)	Creates a ResizableSemaphore with the given number of permits and the given fairness setting.

Method Summary

Modifier and Type	Method	Description
void	increasePermits(int increase)	Increase the number of available permits by the amount in the supplied argument.
protected void	reducePermits(int reduction)	Overridden method to stop it being protected.

Methods inherited from class java.util.concurrent.Semaphore

acquire, acquire, acquireUninterruptibly, acquireUninterruptibly, availablePermits, drainPermits, getQueuedThreads, getQueueLength, hasQueuedThreads, isFair, release, release, toString, tryAcquire, tryAcquire, tryAcquire, tryAcquire

Methods inherited from class java.lang.Object

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

Constructor Detail

ResizableSemaphore

public ResizableSemaphore(int permits,
                          boolean fair)

Creates a ResizableSemaphore with the given number of permits and the given fairness setting.

Parameters:

permits - the initial number of permits available. This value may be negative, in which case releases must occur before any acquires will be granted.

fair - true if this semaphore will guarantee first-in first-out granting of permits under contention, else false

ResizableSemaphore

public ResizableSemaphore(int permits)

Creates a ResizableSemaphore with the given number of permits and nonfair fairness setting.

Parameters:

permits - the initial number of permits available. This value may be negative, in which case releases must occur before any acquires will be granted.

Method Detail

reducePermits

protected void reducePermits(int reduction)

Overridden method to stop it being protected. Decrease the number of available permits by the amount in the supplied argument.

Overrides:

reducePermits in class Semaphore

Parameters:

reduction -

increasePermits

public void increasePermits(int increase)

Increase the number of available permits by the amount in the supplied argument.

Parameters:

increase - The number of permits to add.