Cache for article titles (prefixed DB keys) and ids linked from one source. More...

Collaboration diagram for LinkCache:

[legend]

Public Member Functions
	__construct (TitleFormatter $titleFormatter, WANObjectCache $cache)

	addBadLinkObj (LinkTarget $target)

	addGoodLinkObj ( $id, LinkTarget $target, $len=-1, $redir=null, $revision=0, $model=null, $lang=null)
	Add a link for the title to the link cache. More...

	addGoodLinkObjFromRow (LinkTarget $target, $row)
	Same as above with better interface. More...

	addLinkObj (LinkTarget $nt)
	Add a title to the link cache, return the page_id or zero if non-existent. More...

	clear ()
	Clears cache. More...

	clearBadLink ( $title)

	clearLink (LinkTarget $target)

	forUpdate ( $update=null)
	General accessor to get/set whether the master DB should be used. More...

	getGoodLinkFieldObj (LinkTarget $target, $field)
	Get a field of a title object from cache. More...

	getGoodLinkID ( $title)

	getMutableCacheKeys (WANObjectCache $cache, LinkTarget $t)

	invalidateTitle (LinkTarget $title)
	Purge the link cache for a title. More...

	isBadLink ( $title)

Static Public Member Functions
static	getSelectFields ()
	Fields that LinkCache needs to select. More...

static	singleton ()
	Get an instance of this class. More...

Public Attributes
const	MAX_SIZE = 10000
	How many Titles to store. More...

Private Member Functions
	fetchPageRow (IDatabase $db, LinkTarget $nt)

	isCacheable (LinkTarget $title)

Private Attributes
MapCacheLRU	$badLinks

MapCacheLRU	$goodLinks

bool	$mForUpdate = false

TitleFormatter	$titleFormatter

WANObjectCache	$wanCache

Detailed Description

Cache for article titles (prefixed DB keys) and ids linked from one source.

Definition at line 34 of file LinkCache.php.

Constructor & Destructor Documentation

◆ __construct()

LinkCache::__construct	(	TitleFormatter	$titleFormatter,
		WANObjectCache	$cache
	)

Definition at line 54 of file LinkCache.php.

References $cache, and $titleFormatter.

Member Function Documentation

◆ addBadLinkObj()

LinkCache::addBadLinkObj ( LinkTarget $target )

Parameters

LinkTarget $target

Definition at line 177 of file LinkCache.php.

References isBadLink().

Referenced by addLinkObj().

◆ addGoodLinkObj()

LinkCache::addGoodLinkObj	(		$id,
		LinkTarget	$target,
			$len = `-1`,
			$redir = `null`,
			$revision = `0`,
			$model = `null`,
			$lang = `null`
	)

Add a link for the title to the link cache.

Parameters

int	$id	Page's ID
LinkTarget	$target
int	$len	Text's length
int \| null	$redir	Whether the page is a redirect
int	$revision	Latest revision's ID
string \| null	$model	Latest revision's content model ID
string \| null	$lang	Language code of the page, if not the content language

Definition at line 133 of file LinkCache.php.

References $lang.

◆ addGoodLinkObjFromRow()

LinkCache::addGoodLinkObjFromRow	(	LinkTarget	$target,
			$row
	)

Same as above with better interface.

Since: 1.19

Parameters

LinkTarget	$target
stdClass	$row	Object which has the fields page_id, page_is_redirect, page_latest and page_content_model

Definition at line 155 of file LinkCache.php.

Referenced by addLinkObj().

◆ addLinkObj()

LinkCache::addLinkObj ( LinkTarget $nt )

Add a title to the link cache, return the page_id or zero if non-existent.

Parameters

LinkTarget $nt LinkTarget object to add

Returns: int Page ID or zero

Definition at line 232 of file LinkCache.php.

References $cache, $dbr, $wanCache, addBadLinkObj(), addGoodLinkObjFromRow(), array(), DB_MASTER, DB_REPLICA, fetchPageRow(), MediaWiki\Linker\LinkTarget\getDBkey(), getGoodLinkID(), MediaWiki\Linker\LinkTarget\getNamespace(), MediaWiki\Linker\LinkTarget\inNamespace(), isBadLink(), isCacheable(), MediaWiki\Linker\LinkTarget\isExternal(), NS_SPECIAL, use, wfGetDB(), and wfTimestamp().

◆ clear()

LinkCache::clear ( )

Clears cache.

Definition at line 342 of file LinkCache.php.

◆ clearBadLink()

LinkCache::clearBadLink ( $title )

Parameters

string $title Prefixed DB key

Definition at line 187 of file LinkCache.php.

References $title.

◆ clearLink()

LinkCache::clearLink ( LinkTarget $target )

Parameters

LinkTarget $target

Definition at line 194 of file LinkCache.php.

◆ fetchPageRow()

LinkCache::fetchPageRow	(	IDatabase	$db,
		LinkTarget	$nt
	)

private

Definition at line 310 of file LinkCache.php.

References MediaWiki\Linker\LinkTarget\getDBkey(), MediaWiki\Linker\LinkTarget\getNamespace(), getSelectFields(), isCacheable(), and Wikimedia\Rdbms\IDatabase\selectRow().

Referenced by addLinkObj().

◆ forUpdate()

LinkCache::forUpdate ( $update = null )

General accessor to get/set whether the master DB should be used.

This used to also set the FOR UPDATE option (locking the rows read in order to avoid link table inconsistency), which was later removed for performance on wikis with a high edit rate.

Parameters

bool | null $update

Returns: bool

Definition at line 81 of file LinkCache.php.

References wfSetVar().

◆ getGoodLinkFieldObj()

LinkCache::getGoodLinkFieldObj	(	LinkTarget	$target,
			$field
	)

Get a field of a title object from cache.

If this link is not a cached good title, it will return NULL.

Parameters

LinkTarget	$target
string	$field	('length','redirect','revision','model')

Returns: string|int|null

Definition at line 104 of file LinkCache.php.

◆ getGoodLinkID()

LinkCache::getGoodLinkID ( $title )

Parameters

string $title Prefixed DB key

Returns: int Page ID or zero

Definition at line 89 of file LinkCache.php.

References $title.

Referenced by addLinkObj().

◆ getMutableCacheKeys()

LinkCache::getMutableCacheKeys	(	WANObjectCache	$cache,
		LinkTarget	$t
	)

Parameters

WANObjectCache	$cache
LinkTarget	$t

Returns: string[]

Since: 1.28

Definition at line 289 of file LinkCache.php.

References $cache, $t, and isCacheable().

◆ getSelectFields()

static LinkCache::getSelectFields ( )

static

Fields that LinkCache needs to select.

Since: 1.28

Returns: array

Definition at line 206 of file LinkCache.php.

References $wgContentHandlerUseDB, and $wgPageLanguageUseDB.

Referenced by CategoryViewer\doCategoryQuery(), LinkBatch\doQuery(), LinkHolderArray\doVariants(), fetchPageRow(), ApiPageSet\getPageTableFields(), LinkHolderArray\replaceInternal(), and SpecialPrefixindex\showPrefixChunk().

◆ invalidateTitle()

LinkCache::invalidateTitle ( LinkTarget $title )

Purge the link cache for a title.

Parameters

LinkTarget $title

Since: 1.28

Definition at line 330 of file LinkCache.php.

References $cache, $title, $wanCache, and isCacheable().

◆ isBadLink()

LinkCache::isBadLink ( $title )

Parameters

string $title Prefixed DB key

Returns: bool

Definition at line 117 of file LinkCache.php.

References $title.

Referenced by addBadLinkObj(), and addLinkObj().

◆ isCacheable()

LinkCache::isCacheable ( LinkTarget $title )

private

Definition at line 297 of file LinkCache.php.

References $title, MWNamespace\isContent(), MWNamespace\isSubject(), NS_CATEGORY, NS_FILE, and NS_TEMPLATE.

Referenced by addLinkObj(), fetchPageRow(), getMutableCacheKeys(), and invalidateTitle().

◆ singleton()

static LinkCache::singleton ( )

static

Get an instance of this class.

Returns: LinkCache

Deprecated:: since 1.28, use MediaWikiServices instead

Definition at line 67 of file LinkCache.php.

Referenced by MediaWiki\Extensions\ParserFunctions\ParserFunctions\ifexistCommon().

Member Data Documentation

◆ $badLinks

MapCacheLRU LinkCache::$badLinks

private

Definition at line 38 of file LinkCache.php.

◆ $goodLinks

MapCacheLRU LinkCache::$goodLinks

private

Definition at line 36 of file LinkCache.php.

◆ $mForUpdate

bool LinkCache::$mForUpdate = false

private

Definition at line 43 of file LinkCache.php.

◆ $titleFormatter

TitleFormatter LinkCache::$titleFormatter

private

Definition at line 46 of file LinkCache.php.

Referenced by __construct().

◆ $wanCache

WANObjectCache LinkCache::$wanCache

private

Definition at line 40 of file LinkCache.php.

Referenced by addLinkObj(), and invalidateTitle().

◆ MAX_SIZE

const LinkCache::MAX_SIZE = 10000

How many Titles to store.

There are two caches, so the amount actually stored in memory can be up to twice this.

Definition at line 52 of file LinkCache.php.

The documentation for this class was generated from the following file:

includes/cache/LinkCache.php

Public Member Functions

Static Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ addBadLinkObj()

◆ addGoodLinkObj()

◆ addGoodLinkObjFromRow()

◆ addLinkObj()

◆ clear()

◆ clearBadLink()

◆ clearLink()

◆ fetchPageRow()

◆ forUpdate()

◆ getGoodLinkFieldObj()

◆ getGoodLinkID()

◆ getMutableCacheKeys()

◆ getSelectFields()

◆ invalidateTitle()

◆ isBadLink()

◆ isCacheable()

◆ singleton()

Member Data Documentation

◆ $badLinks

◆ $goodLinks

◆ $mForUpdate

◆ $titleFormatter

◆ $wanCache

◆ MAX_SIZE