Package alluxio.resource

Class RefCountLockResource

java.lang.Object

alluxio.resource.LockResource

alluxio.resource.RWLockResource

alluxio.resource.RefCountLockResource

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class RefCountLockResource
extends RWLockResource

Reference counted Lock resource, automatically unlocks and decrements the reference count. It contains a lock and a reference count for that lock, and will decrement the lock reference count and unlocking when the resource is closed.

Field Summary

Fields inherited from class alluxio.resource.LockResource

mLock

Constructor Summary

Constructors

Constructor	Description
RefCountLockResource(java.util.concurrent.locks.ReentrantReadWriteLock lock, LockMode mode, boolean acquireLock, java.util.concurrent.atomic.AtomicInteger refCount, boolean useTryLock)	Creates a new instance of LockResource using the given lock and reference counter.

Method Summary

Modifier and Type	Method	Description
void	close()	Releases the lock and decrement the ref count if a ref counter was provided at construction time.

Methods inherited from class alluxio.resource.RWLockResource

downgrade

Methods inherited from class alluxio.resource.LockResource

hasSameLock

Methods inherited from class java.lang.Object

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

Constructor Detail

RefCountLockResource

public RefCountLockResource(java.util.concurrent.locks.ReentrantReadWriteLock lock,
                            LockMode mode,
                            boolean acquireLock,
                            java.util.concurrent.atomic.AtomicInteger refCount,
                            boolean useTryLock)

Creates a new instance of LockResource using the given lock and reference counter. The reference counter should have been initialized and incremented outside of this class.

Parameters:

lock - the lock to acquire

mode - the mode to acquire the lock in

acquireLock - whether to lock the lock

refCount - ref count for the lock

useTryLock - applicable only if acquireLock is true. Determines whether or not to use Lock.tryLock() or Lock.lock() to acquire the lock

Method Detail

close

public void close()

Releases the lock and decrement the ref count if a ref counter was provided at construction time.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class LockResource