Package org.eclipse.aether.named.support

Class AdaptedSemaphoreNamedLock

java.lang.Object

org.eclipse.aether.named.support.NamedLockSupport

org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock

All Implemented Interfaces:

AutoCloseable, NamedLock

public class AdaptedSemaphoreNamedLock
extends NamedLockSupport

Named lock support implementation that is using "adapted" semaphore (to be able to use semaphores not sharing common API).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	AdaptedSemaphoreNamedLock.AdaptedSemaphore	Wrapper for semaphore-like stuff, that do not share common ancestor.

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	EXCLUSIVE	Count of permissions involved with exclusive locking
private static final int	NONE	Count of permissions involved with "nop" locking.
private final AdaptedSemaphoreNamedLock.AdaptedSemaphore	semaphore
private static final int	SHARED	Count of permissions involved with shared locking
private final ThreadLocal<Deque<Integer>>	threadPerms

Fields inherited from class org.eclipse.aether.named.support.NamedLockSupport

logger

Constructor Summary

Constructors

Constructor	Description
AdaptedSemaphoreNamedLock(String name, NamedLockFactorySupport factory, AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore)

Method Summary

Modifier and Type	Method	Description
protected boolean	doLockExclusively(long time, TimeUnit unit)
protected boolean	doLockShared(long time, TimeUnit unit)
protected void	doUnlock()

Methods inherited from class org.eclipse.aether.named.support.NamedLockSupport

close, diagnosticState, doClose, lockExclusively, lockShared, name, toString, unlock

Methods inherited from class java.lang.Object

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

Field Details

NONE

private static final int NONE

Count of permissions involved with "nop" locking. When required lock step is preceded with a step that already fulfills currently requested locking, no locking is needed. In other words, caller already possesses the access to lock protected resource. The "nop" locking is used to track proper "boxing" of lock/unlock calls.

See Also:

• Constant Field Values

SHARED

private static final int SHARED

Count of permissions involved with shared locking

See Also:

• Constant Field Values

EXCLUSIVE

private static final int EXCLUSIVE

Count of permissions involved with exclusive locking

See Also:

• Constant Field Values

threadPerms

private final ThreadLocal<Deque<Integer>> threadPerms

semaphore

private final AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore

Constructor Details

AdaptedSemaphoreNamedLock

public AdaptedSemaphoreNamedLock(String name,
 NamedLockFactorySupport factory,
 AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore)

Method Details

doLockShared

protected boolean doLockShared(long time,
 TimeUnit unit)
                        throws InterruptedException

Specified by:

doLockShared in class NamedLockSupport

Throws:

InterruptedException

doLockExclusively

protected boolean doLockExclusively(long time,
 TimeUnit unit)
                             throws InterruptedException

Specified by:

doLockExclusively in class NamedLockSupport

Throws:

InterruptedException

doUnlock

protected void doUnlock()

Specified by:

doUnlock in class NamedLockSupport