ParserCache Class Reference

Collaboration diagram for ParserCache:

Public Member Functions
	deleteOptionsKey ( $page)
	get ( $article, $popts, $useOutdated=false)
	Retrieve the ParserOutput from ParserCache.
	getDirty ( $article, $popts)
	Retrieve the ParserOutput from ParserCache, even if it's outdated.
	getETag ( $article, $popts)
	Provides an E-Tag suitable for the whole page.
	getKey ( $article, $popts, $useOutdated=true)
	Generates a key for caching the given article considering the given parser options.
	save ( $parserOutput, $page, $popts, $cacheTime=null, $revId=null)

Static Public Member Functions
static	singleton ()
	Get an instance of this object.

Protected Member Functions
	__construct (BagOStuff $memCached)
	Setup a cache pathway with a given back-end storage mechanism.
	getOptionsKey ( $page)
	getParserOutputKey ( $article, $hash)

Private Attributes
BagOStuff	$mMemc

Detailed Description

Todo:

document

Definition at line 28 of file ParserCache.php.

Constructor & Destructor Documentation

__construct()

ParserCache::__construct ( BagOStuff  $memCached )

protected

Setup a cache pathway with a given back-end storage mechanism.

This class use an invalidation strategy that is compatible with MultiWriteBagOStuff in async replication mode.

Parameters

BagOStuff

$memCached

Exceptions

MWException

Definition at line 54 of file ParserCache.php.

Member Function Documentation

deleteOptionsKey()

ParserCache::deleteOptionsKey

(

$page

)

Parameters

WikiPage

$page

Since

1.28

Definition at line 86 of file ParserCache.php.

References $page, and getOptionsKey().

get()

ParserCache::get	(		$article,
			$popts,
			$useOutdated = false
	)

Retrieve the ParserOutput from ParserCache.

false if not found or outdated.

Parameters

WikiPage | Article	$article
ParserOptions	$popts
bool	$useOutdated	(default false)

Returns

ParserOutput|bool False on failure

Definition at line 196 of file ParserCache.php.

References $article, $revId, $value, $wgCacheEpoch, false, getKey(), global, wfDebug(), wfDebugLog(), and wfIncrStats().

getDirty()

ParserCache::getDirty	(		$article,
			$popts
	)

Retrieve the ParserOutput from ParserCache, even if it's outdated.

Parameters

WikiPage	$article
ParserOptions	$popts

Returns

ParserOutput|bool False on failure

Definition at line 116 of file ParserCache.php.

References $article, $value, and true.

getETag()

ParserCache::getETag	(		$article,
			$popts
	)

Provides an E-Tag suitable for the whole page.

Note that $article is just the main wikitext. The E-Tag has to be unique to the whole page, even if the article itself is the same, so it uses the complete set of user options. We don't want to use the preference of a different user on a message just because it wasn't used in $article. For example give a Chinese interface to a user with English preferences. That's why we take into account all user options. (r70809 CR)

Parameters

WikiPage	$article
ParserOptions	$popts

Returns

string

Definition at line 104 of file ParserCache.php.

References $article, getParserOutputKey(), and ParserOptions\legacyOptions().

getKey()

ParserCache::getKey	(		$article,
			$popts,
			$useOutdated = true
	)

Generates a key for caching the given article considering the given parser options.

Note

Which parser options influence the cache key is controlled via ParserOutput::recordOption() or ParserOptions::addExtraKey().

Used by Article to provide a unique id for the PoolCounter. It would be preferable to have this code in get() instead of having Article looking in our internals.

Todo:

Document parameter $useOutdated

Parameters

WikiPage	$article
ParserOptions	$popts
bool	$useOutdated	(default true)

Returns

bool|mixed|string

Definition at line 140 of file ParserCache.php.

References $article, $revId, $wgCacheEpoch, getOptionsKey(), getParserOutputKey(), global, ParserOptions\legacyOptions(), ParserOptions\newFromUser(), wfDebug(), wfDebugLog(), wfIncrStats(), and wfWarn().

Referenced by get().

getOptionsKey()

ParserCache::getOptionsKey (   $page )

protected

Parameters

WikiPage

$page

Returns

mixed|string

Definition at line 78 of file ParserCache.php.

References $page, and wfMemcKey().

Referenced by deleteOptionsKey(), getKey(), and save().

getParserOutputKey()

ParserCache::getParserOutputKey (   $article,   $hash  )

protected

Parameters

WikiPage	$article
string	$hash

Returns

mixed|string

Definition at line 63 of file ParserCache.php.

References $article, $wgRequest, global, and wfMemcKey().

Referenced by getETag(), getKey(), and save().

save()

ParserCache::save	(		$parserOutput,
			$page,
			$popts,
			$cacheTime = null,
			$revId = null
	)

Parameters

ParserOutput	$parserOutput
WikiPage	$page
ParserOptions	$popts
string	$cacheTime	Time when the cache was generated
int	$revId	Revision ID that was parsed

Definition at line 270 of file ParserCache.php.

References $page, $parserOutput, $revId, getOptionsKey(), getParserOutputKey(), CacheTime\updateCacheExpiry(), wfDebug(), and wfTimestampNow().

singleton()

static ParserCache::singleton ( )

static

Get an instance of this object.

Returns

ParserCache

Definition at line 36 of file ParserCache.php.

References $parserMemc, and global.

Referenced by PoolWorkArticleView\__construct(), WikiPage\doEditUpdates(), WikiPage\doPurge(), PoolWorkArticleView\doWork(), ApiPurge\execute(), CompareParserCache\execute(), PoolWorkArticleView\fallback(), PoolWorkArticleView\getCachedWork(), WikiPage\getParserOutput(), RefreshLinksJob\runForTitle(), and Article\view().

Member Data Documentation

$mMemc

BagOStuff ParserCache::$mMemc

private

Definition at line 30 of file ParserCache.php.

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

• includes/parser/ParserCache.php