Package com.atlassian.confluence.impl.pages.attachments

Class ReadThroughCachingAttachmentDao

java.lang.Object

com.atlassian.confluence.pages.attachments.AbstractDelegatingAttachmentDao

com.atlassian.confluence.impl.pages.attachments.ReadThroughCachingAttachmentDao

All Implemented Interfaces:

AttachmentDaoInternal, DelegatingAttachmentDao, AttachmentDao, FlushableCachingDao

public class ReadThroughCachingAttachmentDao
extends AbstractDelegatingAttachmentDao
implements FlushableCachingDao

Caches the IDs of attachments retrieved with getLatestAttachment(ContentEntityObject, String) in a cache. Other methods simply delegate to the underlying DAO.

Because the persistent ID of the latest version of an attachment never changes, there's no need to synchronise the cache when an attachment is modified. However, the cache is updated when attachments are removed through this interface.

If for some reason the cache does get out of sync with the database, the lookup using the cached ID will fail. In this situation, we fall back to using the lookup by content ID + file name.

Will also cache misses.

Since:

7.5

Nested Class Summary

Nested classes/interfaces inherited from interface com.atlassian.confluence.pages.persistence.dao.AttachmentDao

AttachmentDao.AttachmentCopier, AttachmentDao.AttachmentMigrator

Constructor Summary

Constructors

Constructor	Description
ReadThroughCachingAttachmentDao(AttachmentDaoInternal delegate, ReadThroughCache<String,Attachment> cache)

Method Summary

Modifier and Type	Method	Description
void	flush()	Flush the caches managed by this DAO.
Attachment	getLatestAttachment(ContentEntityObject content, String fileName)	Return the latest version of the attachment on the specified content with the given filename.
void	moveAttachment(Attachment attachment, Attachment oldAttachment, ContentEntityObject newContent)	Moves an Attachment to a new file name or content object
List<Attachment>	removeAllVersionsFromServer(Attachment attachment)	Removes all versions of an attachment
void	removeAttachmentFromServer(Attachment attachment)	Removes attachment (and all of its versions)
void	removeAttachmentVersionFromServer(Attachment attachment)	Removes an attachment version

Methods inherited from class com.atlassian.confluence.pages.attachments.AbstractDelegatingAttachmentDao

afterMigrationFrom, countLatestVersionsOfAttachments, countLatestVersionsOfAttachmentsOnPageSince, countLatestVersionsOfAttachmentsWithAnyStatus, findAll, findAllVersions, findLatestVersionsIterator, getAttachment, getAttachmentData, getAttachmentData, getAttachmentStatistics, getBackingStorageType, getById, getByIds, getCopier, getDataDao, getDelegate, getLastAddedVersionsOf, getLatestVersionsOfAttachments, getLatestVersionsOfAttachments, getLatestVersionsOfAttachmentsForMultipleCeos, getLatestVersionsOfAttachmentsWithAnyStatus, getLatestVersionsOfAttachmentsWithAnyStatusForContainers, getMigrator, getRemappedAttachmentIds, isAttachmentPresent, prepareForMigrationTo, replaceAttachmentData, saveNewAttachment, saveNewAttachmentVersion, updateAttachment

Methods inherited from class java.lang.Object

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

Constructor Details

ReadThroughCachingAttachmentDao

public ReadThroughCachingAttachmentDao(AttachmentDaoInternal delegate,
 ReadThroughCache<String,Attachment> cache)

Method Details

getLatestAttachment

public Attachment getLatestAttachment(ContentEntityObject content,
 String fileName)

Description copied from interface: AttachmentDao

Return the latest version of the attachment on the specified content with the given filename. Returns null if no attachment with that name on the content exists.

Specified by:

getLatestAttachment in interface AttachmentDao

Overrides:

getLatestAttachment in class AbstractDelegatingAttachmentDao

Parameters:

content - the content to find the attachment on

fileName - the file name of the attachment

Returns:

the latest version of attachment with the given name attached to that content, or null if the attachment does not exist.

removeAttachmentFromServer

public void removeAttachmentFromServer(Attachment attachment)

Description copied from interface: AttachmentDao

Removes attachment (and all of its versions)

Specified by:

removeAttachmentFromServer in interface AttachmentDao

Overrides:

removeAttachmentFromServer in class AbstractDelegatingAttachmentDao

Parameters:

attachment - the Attachment to be removed

removeAllVersionsFromServer

public List<Attachment> removeAllVersionsFromServer(Attachment attachment)

Description copied from interface: AttachmentDaoInternal

Removes all versions of an attachment

Specified by:

removeAllVersionsFromServer in interface AttachmentDaoInternal

Overrides:

removeAllVersionsFromServer in class AbstractDelegatingAttachmentDao

Parameters:

attachment - the Attachment to be removed

Returns:

all versions that have been removed

removeAttachmentVersionFromServer

public void removeAttachmentVersionFromServer(Attachment attachment)

Description copied from interface: AttachmentDao

Removes an attachment version

Specified by:

removeAttachmentVersionFromServer in interface AttachmentDao

Overrides:

removeAttachmentVersionFromServer in class AbstractDelegatingAttachmentDao

Parameters:

attachment - the Attachment version to be removed

flush

public void flush()

Description copied from interface: FlushableCachingDao

Flush the caches managed by this DAO.

Specified by:

flush in interface FlushableCachingDao

moveAttachment

public void moveAttachment(Attachment attachment,
 Attachment oldAttachment,
 ContentEntityObject newContent)

Description copied from interface: AttachmentDao

Moves an Attachment to a new file name or content object

This method assumes that the filename and/or content of the attachment (and its previous versions) have already been updated.

Specified by:

moveAttachment in interface AttachmentDao

Overrides:

moveAttachment in class AbstractDelegatingAttachmentDao

Parameters:

attachment - the Attachment to be moved

oldAttachment - the Attachment before it has been updated

newContent - the new content attachment belongs to