Package org.apache.jackrabbit.core.lock

Class XALockManager

java.lang.Object

org.apache.jackrabbit.core.lock.XALockManager

All Implemented Interfaces:

LockManager, InternalXAResource

public class XALockManager
extends Object
implements LockManager, InternalXAResource

Session-local lock manager that implements the semantical changes inside transactions. This manager validates lock/unlock operations inside its view of the locking space.

Constructor Summary

Constructors

Constructor	Description
XALockManager(LockManagerImpl lockMgr)	Create a new instance of this class.

Method Summary

Modifier and Type	Method	Description
void	addLockToken(SessionImpl session, String lt)	Invoked by a session to inform that a lock token has been added.
void	afterOperation(TransactionContext tx)	Invoked after one of the InternalXAResource.prepare(org.apache.jackrabbit.data.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.data.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.data.core.TransactionContext) method has been called.
void	associate(TransactionContext tx)	Associate this resource with a transaction.
void	beforeOperation(TransactionContext tx)	Invoked before one of the InternalXAResource.prepare(org.apache.jackrabbit.data.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.data.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.data.core.TransactionContext) method is called.
void	checkLock(NodeImpl node)	Check whether the node given is locked by somebody else than the current session.
void	checkLock(Path path, Session session)	Check whether the path given is locked by somebody else than the session described.
void	checkUnlock(Session session, NodeImpl node)	Check whether a session is allowed to unlock a node.
void	commit(TransactionContext tx)	Commit transaction.
boolean	differentXAEnv(LockInfo info)	Return a flag indicating whether a lock info belongs to a different XA environment.
Lock	getLock(NodeImpl node)	Returns the Lock object that applies to a node.
Lock[]	getLocks(SessionImpl session)	Returns all locks owned by the specified session.
boolean	holdsLock(NodeImpl node)	Returns true if the node given holds a lock; otherwise returns false.
boolean	isLocked(NodeImpl node)	Returns true if this node is locked either as a result of a lock held by this node or by a deep lock on a node above this node; otherwise returns false
Lock	lock(NodeImpl node, boolean isDeep, boolean isSessionScoped)	Lock a node.
Lock	lock(NodeImpl node, boolean isDeep, boolean isSessionScoped, long timoutHint, String ownerInfo)	Lock a node.
void	prepare(TransactionContext tx)	Prepare transaction.
void	removeLockToken(SessionImpl session, String lt)	Invoked by a session to inform that a lock token has been removed.
void	rollback(TransactionContext tx)	Rollback transaction.
void	unlock(NodeImpl node)	Removes the lock on a node given by its path.

Methods inherited from class java.lang.Object

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

Constructor Detail

XALockManager

public XALockManager(LockManagerImpl lockMgr)

Create a new instance of this class.

Parameters:

lockMgr - lockMgr global lock manager

Method Detail

lock

public Lock lock(NodeImpl node,
                 boolean isDeep,
                 boolean isSessionScoped)
          throws LockException,
                 RepositoryException

Lock a node. Checks whether the node is not locked and then returns a lock object for this node.

Specified by:

lock in interface LockManager

Parameters:

node - node

isDeep - whether the lock applies to this node only

isSessionScoped - whether the lock is session scoped

Returns:

lock object

Throws:

LockException - if this node already is locked, or some descendant node is locked and isDeep is true

RepositoryException

See Also:

Node.lock(boolean, boolean)

lock

public Lock lock(NodeImpl node,
                 boolean isDeep,
                 boolean isSessionScoped,
                 long timoutHint,
                 String ownerInfo)
          throws LockException,
                 RepositoryException

Description copied from interface: LockManager

Lock a node. Checks whether the node is not locked and then returns a lock object for this node.

Specified by:

lock in interface LockManager

Parameters:

node - Node to create the lock for.

isDeep - whether the lock applies to this node only

isSessionScoped - whether the lock is session scoped

timoutHint - Desired lock timeout in seconds.

ownerInfo - Optional string acting as information about the owner.

Returns:

the lock.

Throws:

LockException - if this node already is locked, or some descendant node is locked and isDeep is true

RepositoryException

See Also:

LockManager.lock(NodeImpl, boolean, boolean, long, String)

getLock

public Lock getLock(NodeImpl node)
             throws LockException,
                    RepositoryException

Returns the Lock object that applies to a node. This may be either a lock on this node itself or a deep lock on a node above this node.

Specified by:

getLock in interface LockManager

Parameters:

node - node

Returns:

lock object

Throws:

LockException - if this node is not locked

RepositoryException

See Also:

Node.getLock()

getLocks

public Lock[] getLocks(SessionImpl session)
                throws RepositoryException

Returns all locks owned by the specified session.

Specified by:

getLocks in interface LockManager

Parameters:

session - session

Returns:

an array of lock objects

Throws:

RepositoryException - if an error occurs

See Also:

SessionImpl.getLocks()

unlock

public void unlock(NodeImpl node)
            throws LockException,
                   RepositoryException

Removes the lock on a node given by its path.

Specified by:

unlock in interface LockManager

Parameters:

node - node

Throws:

LockException - if this node is not locked or the session does not have the correct lock token

RepositoryException

See Also:

Node.unlock()

holdsLock

public boolean holdsLock(NodeImpl node)
                  throws RepositoryException

Returns true if the node given holds a lock; otherwise returns false.

Specified by:

holdsLock in interface LockManager

Parameters:

node - node

Returns:

true if the node given holds a lock; otherwise returns false

Throws:

RepositoryException - If an exception occurs.

See Also:

Node.holdsLock()

isLocked

public boolean isLocked(NodeImpl node)
                 throws RepositoryException

Returns true if this node is locked either as a result of a lock held by this node or by a deep lock on a node above this node; otherwise returns false

Specified by:

isLocked in interface LockManager

Parameters:

node - node

Returns:

true if this node is locked either as a result of a lock held by this node or by a deep lock on a node above this node; otherwise returns false

Throws:

RepositoryException - If an exception occurs.

See Also:

Node.isLocked()

checkLock

public void checkLock(NodeImpl node)
               throws LockException,
                      RepositoryException

Check whether the node given is locked by somebody else than the current session. Access is allowed if the node is not locked or if the session itself holds the lock to this node, i.e. the session contains the lock token for the lock.

Specified by:

checkLock in interface LockManager

Parameters:

node - node to check

Throws:

LockException - if write access to the specified node is not allowed

RepositoryException - if some other error occurs

checkLock

public void checkLock(Path path,
                      Session session)
               throws LockException,
                      RepositoryException

Check whether the path given is locked by somebody else than the session described. Access is allowed if the node is not locked or if the session itself holds the lock to this node, i.e. the session contains the lock token for the lock.

Specified by:

checkLock in interface LockManager

Parameters:

path - path to check

session - session

Throws:

LockException - if write access to the specified path is not allowed

RepositoryException - if some other error occurs

checkUnlock

public void checkUnlock(Session session,
                        NodeImpl node)
                 throws LockException,
                        RepositoryException

Check whether a session is allowed to unlock a node.

Specified by:

checkUnlock in interface LockManager

Throws:

LockException - if unlocking is denied

RepositoryException - if some other error occurs

addLockToken

public void addLockToken(SessionImpl session,
                         String lt)
                  throws RepositoryException

Invoked by a session to inform that a lock token has been added.

Specified by:

addLockToken in interface LockManager

Parameters:

session - session that has a added lock token

lt - added lock token

Throws:

LockException

RepositoryException

removeLockToken

public void removeLockToken(SessionImpl session,
                            String lt)
                     throws RepositoryException

Invoked by a session to inform that a lock token has been removed.

Specified by:

removeLockToken in interface LockManager

Parameters:

session - session that has a removed lock token

lt - removed lock token

Throws:

LockException

RepositoryException

associate

public void associate(TransactionContext tx)

Associate this resource with a transaction. All further operations on the object should be interpreted as part of this transaction and changes recorded in some attribute of the transaction context.

Specified by:

associate in interface InternalXAResource

Parameters:

tx - transaction context, if null disassociate

beforeOperation

public void beforeOperation(TransactionContext tx)

Invoked before one of the InternalXAResource.prepare(org.apache.jackrabbit.data.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.data.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.data.core.TransactionContext) method is called.

Specified by:

beforeOperation in interface InternalXAResource

Parameters:

tx - transaction context

prepare

public void prepare(TransactionContext tx)
             throws TransactionException

Prepare transaction. The transaction is identified by a transaction context.

Specified by:

prepare in interface InternalXAResource

Parameters:

tx - transaction context

Throws:

TransactionException - if an error occurs

commit

public void commit(TransactionContext tx)

Commit transaction. The transaction is identified by a transaction context. If the method throws, other resources get their changes rolled back.

This will finish the update and unlock the shared lock manager.

Specified by:

commit in interface InternalXAResource

Parameters:

tx - transaction context

rollback

public void rollback(TransactionContext tx)

Rollback transaction. The transaction is identified by a transaction context.

This will undo all updates and unlock the shared lock manager.

Specified by:

rollback in interface InternalXAResource

Parameters:

tx - transaction context.

afterOperation

public void afterOperation(TransactionContext tx)

Invoked after one of the InternalXAResource.prepare(org.apache.jackrabbit.data.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.data.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.data.core.TransactionContext) method has been called.

Specified by:

afterOperation in interface InternalXAResource

Parameters:

tx - transaction context

differentXAEnv

public boolean differentXAEnv(LockInfo info)

Return a flag indicating whether a lock info belongs to a different XA environment.