Wrapper around a BagOStuff that caches data in memory. More...

Inheritance diagram for CachedBagOStuff:

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Collaboration diagram for CachedBagOStuff:

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Public Member Functions
	__construct (BagOStuff $backend, $params=[])

	add ( $key, $value, $exptime=0, $flags=0)
	Insert an item if it does not already exist.

	clearLastError ()
	Clear the "last error" registry.

	delete ( $key, $flags=0)
	Delete an item.

	deleteObjectsExpiringBefore ( $date, $progressCallback=false)
	Delete all objects expiring before a certain date.

	get ( $key, $flags=0)
	Get an item with the given key.

	getLastError ()
	Get the "last error" registered; clearLastError() should be called manually.

	incr ( $key, $value=1)
	Increase stored value of $key by $value while preserving its TTL.

	lock ( $key, $timeout=6, $expiry=6, $rclass='')
	Acquire an advisory lock on a key string.

	makeGlobalKey ( $class, $component=null)
	Make a global cache key.

	makeKey ( $class, $component=null)
	Make a cache key, scoped to this instance's keyspace.

	makeKeyInternal ( $keyspace, $args)
	Construct a cache key.

	set ( $key, $value, $exptime=0, $flags=0)
	Set an item.

	setDebug ( $bool)

	unlock ( $key)
	Release an advisory lock on a key string.

Public Member Functions inherited from HashBagOStuff
	__construct ( $params=[])

	clear ()
	Clear all values in cache.

Public Member Functions inherited from BagOStuff
	__construct (array $params=[])
	$params include:

	addBusyCallback (callable $workCallback)
	Let a callback be run to avoid wasting time on special blocking calls.

	changeTTL ( $key, $expiry=0, $flags=0)
	Change the expiration on a key if it exists.

	decr ( $key, $value=1)
	Decrease stored value of $key by $value while preserving its TTL.

	deleteMulti (array $keys, $flags=0)
	Batch deletion.

	getMulti (array $keys, $flags=0)
	Get an associative array containing the item for each of the keys that have items.

	getQoS ( $flag)

	getScopedLock ( $key, $timeout=6, $expiry=30, $rclass='')
	Get a lightweight exclusive self-unlocking lock.

	getWithSetCallback ( $key, $ttl, $callback, $flags=0)
	Get an item with the given key, regenerating and setting it if not found.

	incrWithInit ( $key, $ttl, $value=1, $init=1)
	Increase stored value of $key by $value while preserving its TTL.

	merge ( $key, callable $callback, $exptime=0, $attempts=10, $flags=0)
	Merge changes into the existing cache value (possibly creating a new one)

	setLogger (LoggerInterface $logger)

	setMockTime (&$time)

	setMulti (array $data, $exptime=0, $flags=0)
	Batch insertion/replace.

Protected Attributes
BagOStuff	$backend

Protected Attributes inherited from HashBagOStuff
mixed[]	$bag = []

int	$maxCacheKeys
	Max entries allowed.

Protected Attributes inherited from BagOStuff
callable null	$asyncHandler

int[]	$attrMap = []
	Map of (ATTR_* class constant => QOS_* class constant)

callable[]	$busyCallbacks = []

string	$keyspace = 'local'

int	$lastError = self::ERR_NONE
	ERR_* class constant.

array[]	$locks = []
	Lock tracking.

LoggerInterface	$logger

int	$syncTimeout
	Seconds.

Additional Inherited Members
Public Attributes inherited from HashBagOStuff
const	KEY_CAS = 2

const	KEY_EXP = 1

const	KEY_VAL = 0

Public Attributes inherited from BagOStuff
const	READ_LATEST = 1
	Bitfield constants for get()/getMulti()

const	READ_VERIFIED = 2

const	WRITE_CACHE_ONLY = 8

const	WRITE_SYNC = 4
	Bitfield constants for set()/merge()

Public Attributes inherited from IExpiringStore
const	ATTR_EMULATION = 1

const	ATTR_SYNCWRITES = 2

const	ERR_NO_RESPONSE = 1

const	ERR_NONE = 0

const	ERR_UNEXPECTED = 3

const	ERR_UNREACHABLE = 2

const	QOS_EMULATION_SQL = 1

const	QOS_SYNCWRITES_BE = 2

const	QOS_SYNCWRITES_NONE = 1

const	QOS_SYNCWRITES_QC = 3

const	QOS_SYNCWRITES_SS = 4

const	QOS_UNKNOWN = INF

const	TTL_DAY = 86400

const	TTL_HOUR = 3600

const	TTL_INDEFINITE = 0

const	TTL_MINUTE = 60

const	TTL_MONTH = 2592000

const	TTL_PROC_LONG = 30

const	TTL_PROC_SHORT = 3

const	TTL_SECOND = 1

const	TTL_WEEK = 604800

const	TTL_YEAR = 31536000

Protected Member Functions inherited from HashBagOStuff
	doGet ( $key, $flags=0, &$casToken=null)

	expire ( $key)

	hasKey ( $key)
	Does this bag have a non-null value for the given key?

Protected Member Functions inherited from BagOStuff
	cas ( $casToken, $key, $value, $exptime=0, $flags=0)
	Check and set an item.

	convertToExpiry ( $exptime)
	Convert an optionally relative time to an absolute time.

	convertToRelative ( $exptime)
	Convert an optionally absolute expiry time to a relative time.

	debug ( $text)

	expiryIsRelative ( $exptime)

	getCurrentTime ()

	isInteger ( $value)
	Check if a value is an integer.

	mergeFlagMaps (array $bags)
	Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map.

	mergeViaCas ( $key, $callback, $exptime=0, $attempts=10, $flags=0)

	setLastError ( $err)
	Set the "last error" registry.

Detailed Description

Wrapper around a BagOStuff that caches data in memory.

The differences between CachedBagOStuff and MultiWriteBagOStuff are:

CachedBagOStuff supports only one "backend".
There's a flag for writes to only go to the in-memory cache.
The in-memory cache is always updated.
Locks go to the backend cache (with MultiWriteBagOStuff, it would wind up going to the HashBagOStuff used for the in-memory cache).

@TODO: Make this class use composition instead of calling super

Definition at line 37 of file CachedBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

CachedBagOStuff::__construct	(	BagOStuff	$backend,
			$params = [] )

Parameters

BagOStuff	$backend	Permanent backend to use
array	$params	Parameters for HashBagOStuff

Definition at line 45 of file CachedBagOStuff.php.

References $params, and and().

Member Function Documentation

◆ add()

CachedBagOStuff::add	(	$key,
		$value,
		$exptime = 0,
		$flags = 0 )

Insert an item if it does not already exist.

Parameters

string	$key
mixed	$value
int	$exptime
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success

Reimplemented from HashBagOStuff.

Definition at line 105 of file CachedBagOStuff.php.

References $value, and and().

◆ clearLastError()

CachedBagOStuff::clearLastError ( )

Clear the "last error" registry.

Since: 1.23

Reimplemented from BagOStuff.

Definition at line 132 of file CachedBagOStuff.php.

◆ delete()

CachedBagOStuff::delete	(		$key,
			$flags = 0 )

Delete an item.

Parameters

string $key

Returns: bool True if the item was deleted or not found, false on failure

Parameters

int $flags Bitfield of BagOStuff::WRITE_* constants

Reimplemented from HashBagOStuff.

Definition at line 71 of file CachedBagOStuff.php.

◆ deleteObjectsExpiringBefore()

CachedBagOStuff::deleteObjectsExpiringBefore	(		$date,
			$progressCallback = false )

Delete all objects expiring before a certain date.

Parameters

string	$date	The reference date in MW format
callable \| bool	$progressCallback	Optional, a function which will be called regularly during long-running operations with the percentage progress as the first parameter.

Returns: bool Success, false if unimplemented

Reimplemented from BagOStuff.

Definition at line 85 of file CachedBagOStuff.php.

◆ get()

CachedBagOStuff::get	(		$key,
			$flags = 0 )

Get an item with the given key.

If the key includes a deterministic input hash (e.g. the key can only have the correct value) or complete staleness checks are handled by the caller (e.g. nothing relies on the TTL), then the READ_VERIFIED flag should be set. This lets tiered backends know they can safely upgrade a cached value to higher tiers using standard TTLs.

Parameters

string	$key
int	$flags	Bitfield of BagOStuff::READ_* constants [optional]

Returns: mixed Returns false on failure or if the item does not exist

Reimplemented from BagOStuff.

Definition at line 54 of file CachedBagOStuff.php.

References $ret, and HashBagOStuff\hasKey().

Referenced by MediaWiki\Session\SessionBackend\__construct().

◆ getLastError()

CachedBagOStuff::getLastError ( )

Get the "last error" registered; clearLastError() should be called manually.

Returns: int ERR_* constant for the "last error" registry

Since: 1.23

Reimplemented from BagOStuff.

Definition at line 128 of file CachedBagOStuff.php.

◆ incr()

CachedBagOStuff::incr	(		$key,
			$value = 1 )

Increase stored value of $key by $value while preserving its TTL.

Parameters

string	$key	Key to increase
int	$value	Value to add to $key (default: 1) [optional]

Returns: int|bool New value or false on failure

Reimplemented from HashBagOStuff.

Definition at line 113 of file CachedBagOStuff.php.

References $value.

◆ lock()

CachedBagOStuff::lock	(	$key,
		$timeout = 6,
		$expiry = 6,
		$rclass = '' )

Acquire an advisory lock on a key string.

Note that if reentry is enabled, duplicate calls ignore $expiry

Parameters

string	$key
int	$timeout	Lock wait timeout; 0 for non-blocking [optional]
int	$expiry	Lock expiry [optional]; 1 day maximum
string	$rclass	Allow reentry if set and the current lock used this value

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 120 of file CachedBagOStuff.php.

◆ makeGlobalKey()

CachedBagOStuff::makeGlobalKey	(		$class,
			$component = null )

Make a global cache key.

Since: 1.27

Parameters

string	$class	Key class
string \| null	$component	[optional] Key component (starting with a key collection name)

Returns: string Colon-delimited list of $keyspace followed by escaped components of $args

Reimplemented from BagOStuff.

Definition at line 98 of file CachedBagOStuff.php.

References and().

◆ makeKey()

CachedBagOStuff::makeKey	(		$class,
			$component = null )

Make a cache key, scoped to this instance's keyspace.

Since: 1.27

Parameters

string	$class	Key class
string \| null	$component	[optional] Key component (starting with a key collection name)

Returns: string Colon-delimited list of $keyspace followed by escaped components of $args

Reimplemented from BagOStuff.

Definition at line 94 of file CachedBagOStuff.php.

References and().

Referenced by MediaWiki\Session\SessionBackend\__construct(), MediaWiki\Session\TestBagOStuff\deleteSession(), MediaWiki\Session\TestBagOStuff\getSession(), MediaWiki\Session\TestBagOStuff\getSessionFromBackend(), and MediaWiki\Session\TestBagOStuff\setRawSession().

◆ makeKeyInternal()

CachedBagOStuff::makeKeyInternal	(		$keyspace,
			$args )

Construct a cache key.

Since: 1.27

Parameters

string	$keyspace
array	$args

Returns: string Colon-delimited list of $keyspace followed by escaped components of $args

Reimplemented from BagOStuff.

Definition at line 90 of file CachedBagOStuff.php.

References and().

◆ set()

CachedBagOStuff::set	(	$key,
		$value,
		$exptime = 0,
		$flags = 0 )

Set an item.

Parameters

string	$key
mixed	$value
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success

Reimplemented from HashBagOStuff.

Definition at line 63 of file CachedBagOStuff.php.

References $value.

◆ setDebug()

CachedBagOStuff::setDebug ( $bool )

Parameters

bool $bool

Reimplemented from BagOStuff.

Definition at line 80 of file CachedBagOStuff.php.

◆ unlock()

CachedBagOStuff::unlock ( $key )

Release an advisory lock on a key string.

Parameters

string $key

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 124 of file CachedBagOStuff.php.

Member Data Documentation

◆ $backend

BagOStuff CachedBagOStuff::$backend

protected

Definition at line 39 of file CachedBagOStuff.php.

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

includes/libs/objectcache/CachedBagOStuff.php

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ add()

◆ clearLastError()

◆ delete()

◆ deleteObjectsExpiringBefore()

◆ get()

◆ getLastError()

◆ incr()

◆ lock()

◆ makeGlobalKey()

◆ makeKey()

◆ makeKeyInternal()

◆ set()

◆ setDebug()

◆ unlock()

Member Data Documentation

◆ $backend