org.openrdf.sail.rdbms.util

Class DatabaseLockManager

java.lang.Object

org.openrdf.sail.rdbms.util.DatabaseLockManager

All Implemented Interfaces:

LockManager

public class DatabaseLockManager
extends Object
implements LockManager

Author:

James Leigh

Constructor Summary

Constructors

Constructor and Description
DatabaseLockManager(DataSource ds)
DatabaseLockManager(DataSource ds, String user, String password)

Method Summary

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

DatabaseLockManager

public DatabaseLockManager(DataSource ds)

DatabaseLockManager

public DatabaseLockManager(DataSource ds,
                           String user,
                           String password)

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

isDebugEnabled

public boolean isDebugEnabled()

isLocked

public boolean isLocked()

Description copied from interface: LockManager

Determines if the SAIL is locked.

Specified by:

isLocked in interface LockManager

Returns:

true if the SAIL is already locked.

tryLock

public Lock tryLock()

Description copied from interface: LockManager

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

Specified by:

tryLock in interface LockManager

Returns:

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

lockOrFail

public Lock lockOrFail()
                throws SailLockedException

Description copied from interface: LockManager

Creates a lock in a SAIL 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.