alluxio.resource

Class RWLockResource

java.lang.Object

alluxio.resource.LockResource

alluxio.resource.RWLockResource

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

RefCountLockResource

public class RWLockResource
extends LockResource

The RWLockResource is an extension of the LockResource which allows for downgrading of locks.

Field Summary

Fields inherited from class alluxio.resource.LockResource

mLock

Constructor Summary

Constructors

Constructor and Description
RWLockResource(ReentrantReadWriteLock rwLock, LockMode mode, boolean acquireLock, boolean useTryLock) Creates a new instance of RW lock that will lock with the given mode.

Method Summary

Modifier and Type	Method and Description
boolean	downgrade() Downgrade from a write to a read lock.

Methods inherited from class alluxio.resource.LockResource

close, hasSameLock

Methods inherited from class java.lang.Object

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

Constructor Detail

RWLockResource

public RWLockResource(ReentrantReadWriteLock rwLock,
                      LockMode mode,
                      boolean acquireLock,
                      boolean useTryLock)

Creates a new instance of RW lock that will lock with the given mode.

Parameters:

rwLock - the read-write lock backing the resource

mode - the initial lock mode if acquiring the lock

acquireLock - whether or not to acquire the lock

useTryLock - whether or not to use Lock.tryLock() when acquiring the resource

Method Detail

downgrade

public boolean downgrade()

Downgrade from a write to a read lock.

Returns:

if a successful downgrade was performed. Returns false if it was read locked