Message cache Performs various MediaWiki namespace-related functions. More...

Collaboration diagram for MessageCache:

Public Member Functions
	__construct ($memCached, $useDB, $expiry)

	clear ()
	Clear all stored messages. More...

	disable ()

	enable ()

	figureMessage ($key)

	get ($key, $useDB=true, $langcode=true, $isFullKey=false)
	Get a message from either the content language or the user language. More...

	getAllMessageKeys ($code)
	Get all message keys stored in the message cache for a given language. More...

	getMsgFromNamespace ($title, $code)
	Get a message from the MediaWiki namespace, with caching. More...

	getParser ()

	getParserOptions ()
	ParserOptions is lazy initialised. More...

	isDisabled ()
	Whether DB/cache usage is disabled for determining messages. More...

	loadFromDB ($code, $mode=null)
	Loads cacheable messages from the database. More...

	parse ($text, $title=null, $linestart=true, $interface=false, $language=null)

	replace ($title, $text)
	Updates cache as necessary when message page is changed. More...

	transform ($message, $interface=false, $language=null, $title=null)

Static Public Member Functions
static	destroyInstance ()
	Destroy the singleton instance. More...

static	normalizeKey ($key)
	Normalize message key input. More...

static	singleton ()
	Get the signleton instance of this class. More...

Public Attributes
	$mParser

const	FOR_UPDATE = 1

const	LOCK_TTL = 30
	How long memcached locks last. More...

const	WAIT_SEC = 15
	How long to wait for memcached locks. More...

Protected Member Functions
	getLocalCache ($code)
	Try to load the cache from APC. More...

	getMessageFromFallbackChain ($lang, $lckey, $useDB)
	Given a language, try and fetch messages from that language. More...

	getReentrantScopedLock ($key, $timeout=self::WAIT_SEC)

	getValidationHash ($code)
	Get the md5 used to validate the local APC cache. More...

	isCacheExpired ($cache)
	Is the given cache array expired due to time passing or a version change? More...

	load ($code, $mode=null)
	Loads messages from caches or from database in this order: (1) local message cache (if $wgUseLocalMessageCache is enabled) (2) memcached (3) from the database. More...

	loadFromDBWithLock ($code, array &$where, $mode=null)

	saveToCaches (array $cache, $dest, $code=false)
	Shortcut to update caches. More...

	saveToLocalCache ($code, $cache)
	Save the cache to APC. More...

	setValidationHash ($code, array $cache)
	Set the md5 used to validate the local disk cache. More...

Protected Attributes
	$mCache
	Process local cache of loaded messages that are defined in MediaWiki namespace. More...

	$mDisable
	Should mean that database cannot be used, but check. More...

	$mExpiry
	Lifetime for cache, used by object caching. More...

	$mInParser = false

	$mLoadedLanguages = []
	Variable for tracking which variables are already loaded. More...

BagOStuff	$mMemc

	$mParserOptions
	Message cache has its own parser which it uses to transform messages. More...

WANObjectCache	$wanCache

Private Member Functions
	getMessageForLang ($lang, $lckey, $useDB, &$alreadyTried)
	Given a language, try and fetch messages from that language and its fallbacks. More...

	getMessagePageName ($langcode, $uckey)
	Get the message page name for a given language. More...

Static Private Attributes
static	$instance
	Singleton instance. More...

Detailed Description

Message cache Performs various MediaWiki namespace-related functions.

Definition at line 37 of file MessageCache.php.

Constructor & Destructor Documentation

MessageCache::__construct	(	$memCached,
		$useDB,
		$expiry
	)

Parameters

BagOStuff	$memCached	A cache instance. If none, fall back to CACHE_NONE.
bool	$useDB
int	$expiry	Lifetime for cache.

See also: $mExpiry.

Definition at line 147 of file MessageCache.php.

References $wgUseLocalMessageCache, CACHE_NONE, ObjectCache\getMainWANInstance(), global, and wfGetCache().

Member Function Documentation

MessageCache::clear ( )

Clear all stored messages.

Mainly used after a mass rebuild.

Definition at line 1162 of file MessageCache.php.

References $code, as, Language\fetchLanguageNames(), and wfMemcKey().

static MessageCache::destroyInstance ( )

static

Destroy the singleton instance.

Since: 1.18

Definition at line 120 of file MessageCache.php.

Referenced by ParserTestRunner\staticSetup(), and MessageTest\testRawHtmlInMsg().

MessageCache::disable ( )

Definition at line 1135 of file MessageCache.php.

MessageCache::enable ( )

Definition at line 1139 of file MessageCache.php.

MessageCache::figureMessage ( $key )

Parameters

string $key

Returns: array

Definition at line 1176 of file MessageCache.php.

References $lang, $wgLanguageCode, Language\fetchLanguageName(), and global.

Referenced by replace().

MessageCache::get	(	$key,
		$useDB = `true`,
		$langcode = `true`,
		$isFullKey = `false`
	)

Get a message from either the content language or the user language.

First, assemble a list of languages to attempt getting the message from. This chain begins with the requested language and its fallbacks and then continues with the content language and its fallbacks. For each language in the chain, the following process will occur (in this order):

If a language-specific override, i.e., [[MW:msg/lang]], is available, use that. Note: for the content language, there is no /lang subpage.
Fetch from the static CDB cache.
If available, check the database for fallback language overrides.

This process provides a number of guarantees. When changing this code, make sure all of these guarantees are preserved.

If the requested language is not the content language, then the CDB cache for that specific language will take precedence over the root database page ([[MW:msg]]).
Fallbacks will be just that: fallbacks. A fallback language will never be reached if the message is available anywhere in the language for which it is a fallback.

Parameters

string	$key	The message key
bool	$useDB	If true, look for the message in the DB, false to use only the compiled l10n cache.
bool \| string \| object	$langcode	Code of the language to get the message for. If string and a valid code, will create a standard language object If string but not a valid code, will create a basic language object If boolean and false, create object from the current users language If boolean and true, create object from the wikis content language If language object, use it as given
bool	$isFullKey	Specifies whether $key is a two part key "msg/lang".

Exceptions

MWException When given an invalid key

Returns: string|bool False if the message doesn't exist, otherwise the message (which can be empty)

Definition at line 742 of file MessageCache.php.

References $lang, by, Language\getMessageFor(), getMessageFromFallbackChain(), normalizeKey(), Hooks\run(), string, and wfGetLangObj().

MessageCache::getAllMessageKeys ( $code )

Get all message keys stored in the message cache for a given language.

If $code is the content language code, this will return all message keys for which MediaWiki:msgkey exists. If $code is another language code, this will ONLY return message keys for which MediaWiki:msgkey/$code exists.

Parameters

string $code Language code

Returns: array Array of message keys (strings)

Definition at line 1202 of file MessageCache.php.

References $cache, $code, $wgContLang, global, and load().

MessageCache::getLocalCache ( $code )

protected

Try to load the cache from APC.

Parameters

string $code Optional language code, see documenation of load().

Returns: array|bool The cache array, or false if not in cache.

Definition at line 203 of file MessageCache.php.

References $code, and wfMemcKey().

Referenced by load().

MessageCache::getMessageForLang	(		$lang,
			$lckey,
			$useDB,
		&	$alreadyTried
	)

private

Given a language, try and fetch messages from that language and its fallbacks.

See also: MessageCache::get

Parameters

Language \| StubObject	$lang	Preferred language
string	$lckey	Lowercase key for the message (as for localisation cache)
bool	$useDB	Whether to include messages from the wiki database
	bool[]	$alreadyTried Contains true for each language that has been tried already

Returns: string|bool The message, or false if not found

Definition at line 851 of file MessageCache.php.

References $code, $lang, $wgContLang, as, Language\getFallbacksFor(), getMessagePageName(), getMsgFromNamespace(), and global.

Referenced by getMessageFromFallbackChain().

MessageCache::getMessageFromFallbackChain	(	$lang,
		$lckey,
		$useDB
	)

protected

Given a language, try and fetch messages from that language.

Will also consider fallbacks of that language, the site language, and fallbacks for the site language.

See also: MessageCache::get

Parameters

Language \| StubObject	$lang	Preferred language
string	$lckey	Lowercase key for the message (as for localisation cache)
bool	$useDB	Whether to include messages from the wiki database

Returns: string|bool The message, or false if not found

Definition at line 825 of file MessageCache.php.

References $lang, $wgContLang, getMessageForLang(), and global.

Referenced by get().

MessageCache::getMessagePageName	(	$langcode,
		$uckey
	)

private

Get the message page name for a given language.

Parameters

string	$langcode
string	$uckey	Uppercase key for the message

Returns: string The page name

Definition at line 909 of file MessageCache.php.

References $wgLanguageCode, and global.

Referenced by getMessageForLang().

MessageCache::getMsgFromNamespace	(	$title,
		$code
	)

Get a message from the MediaWiki namespace, with caching.

The key must first be converted to two-part lang/msg form if necessary.

Unlike self::get(), this function doesn't resolve fallback chains, and some callers require this behavior. LanguageConverter::parseCachedTable() and self::get() are some examples in core.

Parameters

string	$title	Message cache key with initial uppercase letter.
string	$code	Code denoting the language to try.

Returns: string|bool The message, or false if it does not exist or on error

Definition at line 931 of file MessageCache.php.

References $code, $content, $dbr, $title, DB_REPLICA, Database\getCacheSetOptions(), load(), Title\makeTitle(), Revision\newKnownCurrent(), NS_MEDIAWIKI, Hooks\run(), wfDebugLog(), wfGetDB(), and wfMemcKey().

Referenced by getMessageForLang().

MessageCache::getParser ( )

Returns: Parser

Definition at line 1073 of file MessageCache.php.

References $mParser, $wgParser, and global.

Referenced by parse(), and transform().

MessageCache::getParserOptions ( )

ParserOptions is lazy initialised.

Returns: ParserOptions

Definition at line 172 of file MessageCache.php.

References $mParserOptions, $wgUser, global, ParserOptions\newFromAnon(), and ParserOptions\setEditSection().

Referenced by parse(), and transform().

MessageCache::getReentrantScopedLock	(	$key,
		$timeout = `self::WAIT_SEC`
	)

protected

Parameters

string	$key	A language message cache key that stores blobs
integer	$timeout	Wait timeout in seconds

Returns: null|ScopedCallback

Definition at line 704 of file MessageCache.php.

Referenced by load(), loadFromDBWithLock(), and replace().

MessageCache::getValidationHash ( $code )

protected

Get the md5 used to validate the local APC cache.

Parameters

string $code

Returns: array (hash or false, bool expiry/volatility status)

Definition at line 653 of file MessageCache.php.

References $code, $value, WANObjectCache\HOLDOFF_TTL, and wfMemcKey().

Referenced by load().

MessageCache::isCacheExpired ( $cache )

protected

Is the given cache array expired due to time passing or a version change?

Parameters

array $cache

Returns: bool

Definition at line 610 of file MessageCache.php.

References $cache, MSG_CACHE_VERSION, and wfTimestampNow().

Referenced by load().

MessageCache::isDisabled ( )

Whether DB/cache usage is disabled for determining messages.

If so, this typically indicates either:

a) load() failed to find a cached copy nor query the DB
b) we are in a special context or error mode that cannot use the DB If the DB is ignored, any derived HTML output or cached objects may be wrong. To avoid long-term cache pollution, TTLs can be adjusted accordingly.

Returns: bool

Since: 1.27

Definition at line 1155 of file MessageCache.php.

References $mDisable.

MessageCache::load	(	$code,
		$mode = `null`
	)

protected

Loads messages from caches or from database in this order: (1) local message cache (if $wgUseLocalMessageCache is enabled) (2) memcached (3) from the database.

When succesfully loading from (2) or (3), all higher level caches are updated for the newest version.

Nothing is loaded if member variable mDisable is true, either manually set by calling code or if message loading fails (is this possible?).

Returns true if cache is already populated or it was succesfully populated, or false if populating empty cache fails. Also returns true if MessageCache is disabled.

Parameters

string	$code	Language to which load messages
integer	$mode	Use MessageCache::FOR_UPDATE to skip process cache [optional]

Exceptions

MWException

Returns: bool

Definition at line 241 of file MessageCache.php.

References $cache, $code, $success, array(), cache, data, getLocalCache(), getReentrantScopedLock(), getValidationHash(), in, info, isCacheExpired(), list, loadFromDBWithLock(), messages, of, or, saveToCaches(), too, wfDebug(), wfDebugLog(), and wfMemcKey().

Referenced by getAllMessageKeys(), getMsgFromNamespace(), loadFromDB(), and replace().

MessageCache::loadFromDB	(	$code,
		$mode = `null`
	)

Loads cacheable messages from the database.

Messages bigger than $wgMaxMsgCacheEntrySize are assigned a special value, and are loaded on-demand from the database later.

Parameters

string	$code	Language code
integer	$mode	Use MessageCache::FOR_UPDATE to skip process cache

Returns: array Loaded messages for storing in caches

Definition at line 446 of file MessageCache.php.

References $cache, $code, $dbr, $res, $value, $wgAdaptiveMessageCache, $wgLanguageCode, $wgMaxMsgCacheEntrySize, as, DB_MASTER, DB_REPLICA, Revision\getRevisionText(), global, load(), MSG_CACHE_VERSION, NS_MEDIAWIKI, serialize(), TS_MW, wfDebugLog(), wfGetDB(), and wfTimestamp().

Referenced by loadFromDBWithLock().

MessageCache::loadFromDBWithLock	(		$code,
		array &	$where,
			$mode = `null`
	)

protected

Parameters

string	$code
array	$where	List of wfDebug() comments
integer	$mode	Use MessageCache::FOR_UPDATE to use DB_MASTER

Returns: bool|string True on success or one of ("cantacquire", "disabled")

Definition at line 382 of file MessageCache.php.

References $cache, $code, $status, $wgUseLocalMessageCache, getReentrantScopedLock(), global, loadFromDB(), saveToCaches(), and wfMemcKey().

Referenced by load().

static MessageCache::normalizeKey ( $key )

static

Normalize message key input.

Parameters

string $key Input message key to be normalized

Returns: string Normalized message key

Definition at line 130 of file MessageCache.php.

References $wgContLang, and global.

Referenced by ApiQueryAllMessages\execute(), get(), and MessageCacheTest\testNormalizeKey().

MessageCache::parse	(	$text,
		$title = `null`,
		$linestart = `true`,
		$interface = `false`,
		$language = `null`
	)

Parameters

string	$text
Title	$title
bool	$linestart	Whether or not this is at the start of a line
bool	$interface	Whether this is an interface message
Language \| string	$language	Language code

Returns: ParserOutput|string

Definition at line 1099 of file MessageCache.php.

References $parser, $res, $title, $wgTitle, Language\factory(), getParser(), getParserOptions(), global, Title\makeTitle(), NS_SPECIAL, wfDebugLog(), and wfGetAllCallers().

MessageCache::replace	(	$title,
		$text
	)

Updates cache as necessary when message page is changed.

Parameters

string \| bool	$title	Name of the page changed (false if deleted)
mixed	$text	New contents of the page.

Definition at line 534 of file MessageCache.php.

References $code, $title, $wgContLang, $wgLanguageCode, $wgMaxMsgCacheEntrySize, as, Language\fetchLanguageNames(), figureMessage(), RequestContext\getMain(), getReentrantScopedLock(), global, list, load(), Hooks\run(), saveToCaches(), and wfMemcKey().

MessageCache::saveToCaches	(	array	$cache,
			$dest,
			$code = `false`
	)

protected

Shortcut to update caches.

Parameters

array	$cache	Cached messages with a version.
string	$dest	Either "local-only" to save to local caches only or "all" to save to all caches.
string \| bool	$code	Language code (default: false)

Returns: bool

Definition at line 633 of file MessageCache.php.

References $code, $success, saveToLocalCache(), setValidationHash(), and wfMemcKey().

Referenced by load(), loadFromDBWithLock(), and replace().

MessageCache::saveToLocalCache	(	$code,
		$cache
	)

protected

Save the cache to APC.

Parameters

string	$code
array	$cache	The cache array

Definition at line 215 of file MessageCache.php.

References $cache, $code, and wfMemcKey().

Referenced by saveToCaches().

MessageCache::setValidationHash	(		$code,
		array	$cache
	)

protected

Set the md5 used to validate the local disk cache.

If $cache has a 'LATEST' UNIX timestamp key, then the hash will not be treated as "volatile" by getValidationHash() for the next few seconds

Parameters

string	$code
array	$cache	Cached messages with a version

Definition at line 688 of file MessageCache.php.

References $code, IExpiringStore\TTL_INDEFINITE, and wfMemcKey().

Referenced by saveToCaches().

static MessageCache::singleton ( )

static

Get the signleton instance of this class.

Since: 1.18

Returns: MessageCache

Definition at line 102 of file MessageCache.php.

References $wgMsgCacheExpiry, $wgUseDatabaseMessages, global, and wfGetMessageCacheStorage().

Referenced by Skin\addToSidebarPlain(), Skin\buildSidebar(), EmailNotification\composeCommonMailtext(), WikiPage\doEditUpdates(), WikiPage\doPurge(), ApiQueryAllMessages\execute(), Message\fetchMessage(), Title\getDefaultMessageText(), Status\getHTML(), ContentHandler\getPageLanguage(), RawAction\getRawText(), Title\hasSourceText(), SideBarTest\initMessagesHref(), WikiPage\onArticleDelete(), LanguageConverter\parseCachedTable(), Message\parseText(), MediaWiki\preOutputCommit(), MWExceptionRenderer\reportOutageHTML(), MediaWikiLangTestCase\setUp(), MessageCacheTest\setUp(), ParserTestRunner\setupDatabase(), MessageCacheTest\testFullKeyBehaviour(), MessageCacheTest\testMessageFallbacks(), and Message\transformText().

MessageCache::transform	(	$message,
		$interface = `false`,
		$language = `null`,
		$title = `null`
	)

Parameters

string	$message
bool	$interface
string	$language	Language code
Title	$title

Returns: string

Definition at line 1044 of file MessageCache.php.

References $parser, $title, getParser(), and getParserOptions().

Member Data Documentation

MessageCache MessageCache::$instance

staticprivate

Singleton instance.

Definition at line 94 of file MessageCache.php.

array MessageCache::$mCache

protected

Process local cache of loaded messages that are defined in MediaWiki namespace.

First array level is a language code, second level is message key and the values are either message content prefixed with space, or !NONEXISTENT for negative caching.

Definition at line 53 of file MessageCache.php.

bool MessageCache::$mDisable

protected

Should mean that database cannot be used, but check.

Definition at line 59 of file MessageCache.php.

Referenced by isDisabled().

MessageCache::$mExpiry

protected

Lifetime for cache, used by object caching.

Set on construction, see __construct().

Definition at line 65 of file MessageCache.php.

bool MessageCache::$mInParser = false

protected

Definition at line 82 of file MessageCache.php.

array MessageCache::$mLoadedLanguages = []

protected

Variable for tracking which variables are already loaded.

Definition at line 77 of file MessageCache.php.

BagOStuff MessageCache::$mMemc

protected

Definition at line 85 of file MessageCache.php.

MessageCache::$mParser

Definition at line 71 of file MessageCache.php.

Referenced by getParser().

MessageCache::$mParserOptions

protected

Message cache has its own parser which it uses to transform messages.

Definition at line 71 of file MessageCache.php.

Referenced by getParserOptions().

WANObjectCache MessageCache::$wanCache

protected

Definition at line 87 of file MessageCache.php.

const MessageCache::FOR_UPDATE = 1

Definition at line 38 of file MessageCache.php.

const MessageCache::LOCK_TTL = 30

How long memcached locks last.

Definition at line 43 of file MessageCache.php.

const MessageCache::WAIT_SEC = 15

How long to wait for memcached locks.

Definition at line 41 of file MessageCache.php.

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

includes/cache/MessageCache.php

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Private Member Functions

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation