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.

Field Summary

Fields

Modifier and Type	Field	Description
private final File	dir
private static final String	INFO_FILE_NAME
private static final String	LOCK_DIR_NAME
private static final String	LOCK_FILE_NAME
private final org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor	Description
DirectoryLockManager(File dir)

Method Summary

Modifier and Type	Method	Description
private Lock	createLock(RandomAccessFile raf, FileLock fileLock)
String	getLocation()	Technical description of where the lock is located, such as a URL.
private File	getLockDir()
private String	getLockedBy()
private String	getProcessName()
boolean	isLocked()	Determines if the directory is locked.
Lock	lockOrFail()	Creates a lock in a directory if it does not yet exist.
private void	removeInvalidLock(File lockDir)
boolean	revokeLock()	Revokes a lock owned by another process.
private void	sign(File infoFile)
Lock	tryLock()	Creates a lock in a directory if it does not yet exist.

Methods inherited from class Object

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

Field Details

LOCK_DIR_NAME

private static final String LOCK_DIR_NAME

See Also:

• Constant Field Values

LOCK_FILE_NAME

private static final String LOCK_FILE_NAME

See Also:

• Constant Field Values

INFO_FILE_NAME

private static final String INFO_FILE_NAME

See Also:

• Constant Field Values

logger

private final org.slf4j.Logger logger

dir

private final File dir

Constructor Details

DirectoryLockManager

public DirectoryLockManager(File dir)

Method Details

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

getLockDir

private File getLockDir()

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.

removeInvalidLock

private void removeInvalidLock(File lockDir)

getLockedBy

private String getLockedBy()

createLock

private Lock createLock(RandomAccessFile raf,
 FileLock fileLock)

sign

private void sign(File infoFile)
           throws IOException

Throws:

IOException

getProcessName

private String getProcessName()