com.atlassian.crowd.directory.synchronisation.cache

Class UsnChangedCacheRefresher

java.lang.Object

com.atlassian.crowd.directory.synchronisation.cache.AbstractCacheRefresher<LDAPGroupWithAttributes>

com.atlassian.crowd.directory.synchronisation.cache.UsnChangedCacheRefresher

All Implemented Interfaces:

CacheRefresher

public class UsnChangedCacheRefresher
extends AbstractCacheRefresher<LDAPGroupWithAttributes>
implements CacheRefresher

Retrieves latest changes from MS Active Directory in order to allow "delta" cache refreshes.

See http://msdn.microsoft.com/en-us/library/ms677625.aspx and http://msdn.microsoft.com/en-us/library/ms677627%28VS.85%29.aspx for details on polling Microsoft Active Directory.

This class is guaranteed to be run from a single thread at a time by per directory. This means it does not need to worry about race-conditions, but still must consider safe publication of variables (per directory). The incremental sync of users comes in two flavors:

• Legacy mode - based on usnChanged attribute only
• New 'bulletproof' mode (default) - using both usnChanged and ObjectGUID diff between internal and remote directory

It is possible to switch back to 'legacy mode' by supplying a system property named PROPERTY_USE_LEGACY_AD_INCREMENTAL_SYNC set to true.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROPERTY_USE_LEGACY_AD_INCREMENTAL_SYNC

Fields inherited from class com.atlassian.crowd.directory.synchronisation.cache.AbstractCacheRefresher

remoteDirectory

Constructor Summary

Constructors

Constructor and Description
UsnChangedCacheRefresher(MicrosoftActiveDirectory activeDirectory)

Method Summary

Modifier and Type	Method and Description
CacheSynchronisationResult	synchroniseAll(DirectoryCache directoryCache) Will visit all Users and Groups in the external directory in order to do a Full refresh.
protected PartialSynchronisationResult<LDAPGroupWithAttributes>	synchroniseAllGroups(DirectoryCache directoryCache) This method is expected to fetch the groups to update (or all currently in the remote directory) and update the directory cache (call the appropriate method for deleting and then the appropriate method for updating/adding).
protected PartialSynchronisationResult<? extends UserWithAttributes>	synchroniseAllUsers(DirectoryCache directoryCache) This method is expected to fetch the users to update (or all currently in the remote directory) and update the directory cache (call the appropriate method for deleting and then the appropriate method for updating/adding).
CacheSynchronisationResult	synchroniseChanges(DirectoryCache directoryCache, String highestCommittedUsn) Attempts to synchronise changes since the last refresh as opposed to performing a full synchronisation.

Methods inherited from class com.atlassian.crowd.directory.synchronisation.cache.AbstractCacheRefresher

directoryDescription, isGroupAttributeSynchronisationEnabled, isIncrementalSyncEnabled, isUserAttributeSynchronisationEnabled, synchroniseAllGroupAttributes, synchroniseAllUserAttributes, synchroniseMemberships

Methods inherited from class java.lang.Object

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

Field Detail

PROPERTY_USE_LEGACY_AD_INCREMENTAL_SYNC

public static final String PROPERTY_USE_LEGACY_AD_INCREMENTAL_SYNC

See Also:

Constant Field Values

Constructor Detail

UsnChangedCacheRefresher

public UsnChangedCacheRefresher(MicrosoftActiveDirectory activeDirectory)

Method Detail

synchroniseChanges

public CacheSynchronisationResult synchroniseChanges(DirectoryCache directoryCache,
                                                     @Nullable
                                                     String highestCommittedUsn)
                                              throws OperationFailedException

Description copied from interface: CacheRefresher

Attempts to synchronise changes since the last refresh as opposed to performing a full synchronisation. Returns true if changes since the last refresh were synchronised successfully.

Specified by:

synchroniseChanges in interface CacheRefresher

Parameters:

directoryCache - the DirectoryCache to update.

Returns:

result of the synchronisation

Throws:

OperationFailedException - if there was an error processing the operation

synchroniseAll

public CacheSynchronisationResult synchroniseAll(DirectoryCache directoryCache)
                                          throws OperationFailedException

Description copied from interface: CacheRefresher

Will visit all Users and Groups in the external directory in order to do a Full refresh.

Specified by:

synchroniseAll in interface CacheRefresher

Overrides:

synchroniseAll in class AbstractCacheRefresher<LDAPGroupWithAttributes>

Parameters:

directoryCache - the DirectoryCache to update.

Returns:

result of synchronisation

Throws:

OperationFailedException - if there was an error processing the operation

synchroniseAllUsers

protected PartialSynchronisationResult<? extends UserWithAttributes> synchroniseAllUsers(DirectoryCache directoryCache)
                                                                                  throws OperationFailedException

Description copied from class: AbstractCacheRefresher

This method is expected to fetch the users to update (or all currently in the remote directory) and update the directory cache (call the appropriate method for deleting and then the appropriate method for updating/adding). This will only fetch user attributes when user attribute synchronisation is enabled. User attributes will be updated if fetched in AbstractCacheRefresher.synchroniseAll(DirectoryCache) if the directory allows that.

Specified by:

synchroniseAllUsers in class AbstractCacheRefresher<LDAPGroupWithAttributes>

Parameters:

directoryCache - the cache which this method should update

Returns:

list of users that were passed into the directory cache and an optional sync token if the directory has separate sync tokens for users and groups

Throws:

OperationFailedException

synchroniseAllGroups

protected PartialSynchronisationResult<LDAPGroupWithAttributes> synchroniseAllGroups(DirectoryCache directoryCache)
                                                                              throws OperationFailedException

Description copied from class: AbstractCacheRefresher

This method is expected to fetch the groups to update (or all currently in the remote directory) and update the directory cache (call the appropriate method for deleting and then the appropriate method for updating/adding). This will only fetch group attributes when group attribute synchronisation is enabled. Group attributes will be updated if fetched in AbstractCacheRefresher.synchroniseAll(DirectoryCache) if the directory allows that.

Specified by:

synchroniseAllGroups in class AbstractCacheRefresher<LDAPGroupWithAttributes>

Parameters:

directoryCache - the cache which this method should update

Returns:

list of groups that were passed into the directory cache and an optional sync token if the directory has separate sync tokens for users and groups

Throws:

OperationFailedException