Package org.eclipse.aether.named.support
Class AdaptedSemaphoreNamedLock
- java.lang.Object
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- org.eclipse.aether.named.support.NamedLockSupport
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- org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock
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- All Implemented Interfaces:
java.lang.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).
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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.
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Field Summary
Fields Modifier and Type Field Description private static int
EXCLUSIVE
Count of permissions involved with exclusive lockingprivate static int
NONE
Count of permissions involved with "nop" locking.private AdaptedSemaphoreNamedLock.AdaptedSemaphore
semaphore
private static int
SHARED
Count of permissions involved with shared lockingprivate java.lang.ThreadLocal<java.util.Deque<java.lang.Integer>>
threadPerms
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Fields inherited from class org.eclipse.aether.named.support.NamedLockSupport
logger
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Constructor Summary
Constructors Constructor Description AdaptedSemaphoreNamedLock(java.lang.String name, NamedLockFactorySupport factory, AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
lockExclusively(long time, java.util.concurrent.TimeUnit unit)
Tries to lock exclusively, may block for given time.boolean
lockShared(long time, java.util.concurrent.TimeUnit unit)
Tries to lock shared, may block for given time.void
unlock()
Unlocks the lock, must be invoked by caller after one of theNamedLock.lockShared(long, TimeUnit)
orNamedLock.lockExclusively(long, TimeUnit)
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Methods inherited from class org.eclipse.aether.named.support.NamedLockSupport
close, name
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Field Detail
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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
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SHARED
private static final int SHARED
Count of permissions involved with shared locking- See Also:
- Constant Field Values
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EXCLUSIVE
private static final int EXCLUSIVE
Count of permissions involved with exclusive locking- See Also:
- Constant Field Values
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threadPerms
private final java.lang.ThreadLocal<java.util.Deque<java.lang.Integer>> threadPerms
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semaphore
private final AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore
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Constructor Detail
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AdaptedSemaphoreNamedLock
public AdaptedSemaphoreNamedLock(java.lang.String name, NamedLockFactorySupport factory, AdaptedSemaphoreNamedLock.AdaptedSemaphore semaphore)
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Method Detail
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lockShared
public boolean lockShared(long time, java.util.concurrent.TimeUnit unit) throws java.lang.InterruptedException
Description copied from interface:NamedLock
Tries to lock shared, may block for given time. If successful, returnstrue
.- Throws:
java.lang.InterruptedException
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lockExclusively
public boolean lockExclusively(long time, java.util.concurrent.TimeUnit unit) throws java.lang.InterruptedException
Description copied from interface:NamedLock
Tries to lock exclusively, may block for given time. If successful, returnstrue
.- Throws:
java.lang.InterruptedException
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unlock
public void unlock()
Description copied from interface:NamedLock
Unlocks the lock, must be invoked by caller after one of theNamedLock.lockShared(long, TimeUnit)
orNamedLock.lockExclusively(long, TimeUnit)
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