org.eclipse.rdf4j.sail.helpers

Class DirectoryLockManager

java.lang.Object

org.eclipse.rdf4j.sail.helpers.DirectoryLockManager

All Implemented Interfaces:

LockManager

public class DirectoryLockManager
extends Object
implements LockManager

Used to create a lock in a directory.

Author:

James Leigh, Arjohn Kampman

Constructor Summary

Constructors

Constructor and Description
DirectoryLockManager(File dir)

Method Summary

Modifier and Type	Method and Description
String	getLocation() Technical description of where the lock is located, such as a URL.
boolean	isLocked() Determines if the directory is locked.
Lock	lockOrFail() Creates a lock in a directory if it does not yet exist.
boolean	revokeLock() Revokes a lock owned by another process.
Lock	tryLock() Creates a lock in a directory if it does not yet exist.

Methods inherited from class java.lang.Object

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

Constructor Detail

DirectoryLockManager

public DirectoryLockManager(File dir)

Method Detail

getLocation

public String getLocation()

Description copied from interface: LockManager

Technical description of where the lock is located, such as a URL.

Specified by:

getLocation in interface LockManager

isLocked

public boolean isLocked()

Determines if the directory is locked.

Specified by:

isLocked in interface LockManager

Returns:

true if the directory is already locked.

tryLock

public Lock tryLock()

Creates a lock in a directory if it does not yet exist.

Specified by:

tryLock in interface LockManager

Returns:

a newly acquired lock or null if the directory is already locked.

lockOrFail

public Lock lockOrFail()
                throws SailLockedException

Creates a lock in a directory if it does not yet exist.

Specified by:

lockOrFail in interface LockManager

Returns:

a newly acquired lock.

Throws:

SailLockedException - if the directory is already locked.

revokeLock

public boolean revokeLock()

Revokes a lock owned by another process.

Specified by:

revokeLock in interface LockManager

Returns:

true if a lock was successfully revoked.