org.opencms.lock
Class CmsLockManager

java.lang.Object
  org.opencms.lock.CmsLockManager

public final class CmsLockManager
extends java.lang.Object

The CmsLockManager is used by the Cms application to detect the lock state of a resource.

The lock state depends on the path of the resource, and probably locked parent folders. The result of a query to the lock manager are instances of CmsLock objects.

Since:

6.0.0

Version:

$Revision: 1.53 $

Author:

Michael Emmerich, Thomas Weckert, Andreas Zahner, Michael Moossen

See Also:

CmsObject.getLock(CmsResource), CmsLock

Constructor Summary

CmsLockManager(CmsDriverManager driverManager)
Default constructor, creates a new lock manager.

Method Summary

void	addResource(CmsDbContext dbc, CmsResource resource, CmsUser user, CmsProject project, CmsLockType type) Adds a resource to the lock manager.
int	countExclusiveLocksInProject(CmsProject project) Counts the exclusive locked resources in a project.
CmsLock	getLock(CmsDbContext dbc, CmsResource resource) Returns the lock state of the given resource.
CmsLock	getLock(CmsDbContext dbc, CmsResource resource, boolean includeSiblings) Returns the lock state of the given resource.
java.util.List	getLocks(CmsDbContext dbc, java.lang.String resourceName, CmsLockFilter filter) Returns all exclusive locked resources matching the given resource name and filter.
boolean	hasSystemLocks(CmsDbContext dbc, CmsResource resource) Returns true if the given resource contains a resource that has a system lock.
void	moveResource(java.lang.String source, java.lang.String destination) Moves a lock during the move resource operation.
void	readLocks(CmsDbContext dbc) Reads the latest saved locks from the database and installs them to this lock manager.
void	removeDeletedResource(CmsDbContext dbc, java.lang.String resourceName) Removes a resource after it has been deleted by the driver manager.
void	removeLocks(CmsUUID userId) Removes all locks of a user.
CmsLock	removeResource(CmsDbContext dbc, CmsResource resource, boolean forceUnlock, boolean removeSystemLock) Removes a resource from the lock manager.
void	removeResourcesInProject(CmsUUID projectId, boolean removeSystemLocks) Removes all resources locked in a project.
void	removeTempLocks(CmsUUID userId) Removes all exclusive temporary locks of a user.
java.lang.String	toString()
void	writeLocks(CmsDbContext dbc) Writes the locks that are currently stored in-memory to the database to allow restoring them in later startups.

Methods inherited from class java.lang.Object

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

Constructor Detail

CmsLockManager

public CmsLockManager(CmsDriverManager driverManager)

Default constructor, creates a new lock manager.

Parameters:

driverManager - the driver manager instance

Method Detail

addResource

public void addResource(CmsDbContext dbc,
                        CmsResource resource,
                        CmsUser user,
                        CmsProject project,
                        CmsLockType type)
                 throws CmsLockException,
                        CmsException

Adds a resource to the lock manager.

Parameters:

dbc - the current database context

resource - the resource

user - the user who locked the resource

project - the project where the resource is locked

type - the lock type

Throws:

CmsLockException - if the resource is locked

CmsException - if something goes wrong

countExclusiveLocksInProject

public int countExclusiveLocksInProject(CmsProject project)

Counts the exclusive locked resources in a project.

Parameters:

project - the project

Returns:

the number of exclusive locked resources in the specified project

getLock

public CmsLock getLock(CmsDbContext dbc,
                       CmsResource resource)
                throws CmsException

Returns the lock state of the given resource.

In case no lock is set, the null lock which can be obtained by CmsLock.getNullLock() is returned.

Parameters:

dbc - the current database context

resource - the resource

Returns:

the lock state of the given resource

Throws:

CmsException - if something goes wrong

getLock

public CmsLock getLock(CmsDbContext dbc,
                       CmsResource resource,
                       boolean includeSiblings)
                throws CmsException

Returns the lock state of the given resource.

In case no lock is set, the null lock which can be obtained by CmsLock.getNullLock() is returned.

Parameters:

dbc - the current database context

resource - the resource

includeSiblings - if siblings (shared locks) should be included in the search

Returns:

the lock state of the given resource

Throws:

CmsException - if something goes wrong

getLocks

public java.util.List getLocks(CmsDbContext dbc,
                               java.lang.String resourceName,
                               CmsLockFilter filter)
                        throws CmsException

Returns all exclusive locked resources matching the given resource name and filter.

Parameters:

dbc - the database context

resourceName - the resource name

filter - the lock filter

Returns:

a list of root paths

Throws:

CmsException - if something goes wrong

hasSystemLocks

public boolean hasSystemLocks(CmsDbContext dbc,
                              CmsResource resource)
                       throws CmsException

Returns true if the given resource contains a resource that has a system lock.

This check is required for certain operations on folders.

Parameters:

dbc - the database context

resource - the resource to check the system locks for

Returns:

true if the given resource contains a resource that has a system lock

Throws:

CmsException - if something goes wrong

moveResource

public void moveResource(java.lang.String source,
                         java.lang.String destination)

Moves a lock during the move resource operation.

Parameters:

source - the source root path

destination - the destination root path

readLocks

public void readLocks(CmsDbContext dbc)
               throws CmsException

Reads the latest saved locks from the database and installs them to this lock manager.

Parameters:

dbc - the current database context

Throws:

CmsException - if something goes wrong

removeDeletedResource

public void removeDeletedResource(CmsDbContext dbc,
                                  java.lang.String resourceName)
                           throws CmsException

Removes a resource after it has been deleted by the driver manager.

Parameters:

dbc - the current database context

resourceName - the root path of the deleted resource

Throws:

CmsException - if something goes wrong

removeLocks

public void removeLocks(CmsUUID userId)

Removes all locks of a user.

Edition and system locks are removed.

Parameters:

userId - the id of the user whose locks should be removed

removeResource

public CmsLock removeResource(CmsDbContext dbc,
                              CmsResource resource,
                              boolean forceUnlock,
                              boolean removeSystemLock)
                       throws CmsException

Removes a resource from the lock manager.

The forceUnlock option should be used with caution.
forceUnlock will remove the lock by ignoring any rules which may cause wrong lock states.

Parameters:

dbc - the current database context

resource - the resource

forceUnlock - true, if a resource is forced to get unlocked (only edition locks), no matter by which user and in which project the resource is currently locked

removeSystemLock - true, if you also want to remove system locks

Returns:

the previous CmsLock object of the resource, or CmsLock.getNullLock() if the resource was unlocked

Throws:

CmsException - if something goes wrong

removeResourcesInProject

public void removeResourcesInProject(CmsUUID projectId,
                                     boolean removeSystemLocks)

Removes all resources locked in a project.

Parameters:

projectId - the ID of the project where the resources have been locked

removeSystemLocks - if true, also system locks are removed

removeTempLocks

public void removeTempLocks(CmsUUID userId)

Removes all exclusive temporary locks of a user.

Only edition lock can be temporary, so no system locks are removed.

Parameters:

userId - the id of the user whose locks has to be removed

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()

writeLocks

public void writeLocks(CmsDbContext dbc)
                throws CmsException

Writes the locks that are currently stored in-memory to the database to allow restoring them in later startups.

This overwrites the locks previously stored in the underlying database table.

Parameters:

dbc - the current database context

Throws:

CmsException - if something goes wrong