A cache class that replicates all writes to multiple child caches. More...

Inheritance diagram for MultiWriteBagOStuff:

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Collaboration diagram for MultiWriteBagOStuff:

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Public Member Functions
	__construct ( $params)
	$params include: More...

	add ( $key, $value, $exptime=0)

	clearLastError ()
	Clear the "last error" registry. More...

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

	delete ( $key)
	Delete an item. More...

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

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

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

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

	makeGlobalKey ()
	Make a global cache key. More...

	makeKey ()
	Make a cache key, scoped to this instance's keyspace. More...

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

	setDebug ( $debug)

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

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

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

	changeTTL ( $key, $expiry=0)
	Reset the TTL on a key if it exists. More...

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

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

	getQoS ( $flag)

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

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

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

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

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

	modifySimpleRelayEvent (array $event)
	Modify a cache update operation array for EventRelayer::notify() More...

	setLogger (LoggerInterface $logger)

	setMulti (array $data, $exptime=0)
	Batch insertion. More...

Public Attributes
const	ALL = INF
	Idiom for "write to all backends". More...

const	UPGRADE_TTL = 3600

Public Attributes inherited from BagOStuff
const	ERR_NO_RESPONSE = 1

const	ERR_NONE = 0
	Possible values for getLastError() More...

const	ERR_UNEXPECTED = 3

const	ERR_UNREACHABLE = 2

const	READ_LATEST = 1
	Bitfield constants for get()/getMulti() More...

const	READ_VERIFIED = 2

const	WRITE_CACHE_ONLY = 2

const	WRITE_SYNC = 1
	Bitfield constants for set()/merge() More...

Public Attributes inherited from IExpiringStore
const	ATTR_EMULATION = 1

const	ATTR_SYNCWRITES = 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_WEEK = 604800

const	TTL_YEAR = 31536000

Protected Member Functions
	doGet ( $key, $flags=0)

	doWrite ( $count, $asyncWrites, $method)
	Apply a write method to the first $count backing caches. More...

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

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

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

	debug ( $text)

	getWithToken ( $key, &$casToken, $flags=0)

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

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

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

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

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

Protected Attributes
bool	$asyncWrites = false
	Use async secondary writes. More...

BagOStuff[]	$caches

Protected Attributes inherited from BagOStuff
callback null	$asyncHandler

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

callable[]	$busyCallbacks = []

string	$keyspace = 'local'

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

array[]	$locks = []
	Lock tracking. More...

LoggerInterface	$logger

int	$syncTimeout
	Seconds. More...

Detailed Description

A cache class that replicates all writes to multiple child caches.

Reads are implemented by reading from the caches in the order they are given in the configuration until a cache gives a positive result.

Definition at line 31 of file MultiWriteBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

MultiWriteBagOStuff::__construct ( $params )

$params include:

caches: A numbered array of either ObjectFactory::getObjectFromSpec arrays yeilding BagOStuff objects or direct BagOStuff objects. If using the former, the 'args' field must be set. The first cache is the primary one, being the first to be read in the fallback chain. Writes happen to all stores in the order they are defined. However, lock()/unlock() calls only use the primary store.
replication: Either 'sync' or 'async'. This controls whether writes to secondary stores are deferred when possible. Async writes require setting 'asyncHandler'. HHVM register_postsend_function() function. Async writes can increase the chance of some race conditions or cause keys to expire seconds later than expected. It is safe to use for modules when cached values: are immutable, invalidation uses logical TTLs, invalidation uses etag/timestamp validation against the DB, or merge() is used to handle races.
Parameters

array $params

Exceptions

InvalidArgumentException

Definition at line 62 of file MultiWriteBagOStuff.php.

References $params, as, ObjectFactory\getObjectFromSpec(), and BagOStuff\mergeFlagMaps().

Member Function Documentation

◆ add()

MultiWriteBagOStuff::add	(	$key,
		$value,
		$exptime = `0`
	)

Parameters

string	$key
mixed	$value
int	$exptime

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 141 of file MultiWriteBagOStuff.php.

References $value, and doWrite().

◆ clearLastError()

MultiWriteBagOStuff::clearLastError ( )

Clear the "last error" registry.

Since: 1.23

Reimplemented from BagOStuff.

Definition at line 167 of file MultiWriteBagOStuff.php.

◆ decr()

MultiWriteBagOStuff::decr	(	$key,
		$value = `1`
	)

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

Parameters

string	$key
int	$value

Returns: int|bool New value or false on failure

Reimplemented from BagOStuff.

Definition at line 149 of file MultiWriteBagOStuff.php.

References $value, and doWrite().

◆ delete()

MultiWriteBagOStuff::delete ( $key )

Delete an item.

Parameters

string $key

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

Reimplemented from BagOStuff.

Definition at line 137 of file MultiWriteBagOStuff.php.

References doWrite().

◆ deleteObjectsExpiringBefore()

MultiWriteBagOStuff::deleteObjectsExpiringBefore	(	$date,
		$progressCallback = `false`
	)

Delete objects expiring before a certain date.

Succeed if any of the child caches succeed.

Parameters

string	$date
bool \| callable	$progressCallback

Returns: bool

Reimplemented from BagOStuff.

Definition at line 225 of file MultiWriteBagOStuff.php.

References $cache, $ret, and as.

◆ doGet()

MultiWriteBagOStuff::doGet	(	$key,
		$flags = `0`
	)

protected

Parameters

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

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

Reimplemented from BagOStuff.

Definition at line 101 of file MultiWriteBagOStuff.php.

References $cache, $flags, $value, as, and doWrite().

◆ doWrite()

MultiWriteBagOStuff::doWrite	(	$count,
		$asyncWrites,
		$method
	)

protected

Apply a write method to the first $count backing caches.

Parameters

int	$count
bool	$asyncWrites
string	$method
mixed	$args,...

Returns: bool

Definition at line 180 of file MultiWriteBagOStuff.php.

References $args, $asyncWrites, $cache, BagOStuff\$logger, $ret, as, serialize(), unserialize(), and use.

Referenced by add(), decr(), delete(), doGet(), incr(), and set().

◆ getLastError()

MultiWriteBagOStuff::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 163 of file MultiWriteBagOStuff.php.

◆ incr()

MultiWriteBagOStuff::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)

Returns: int|bool New value or false on failure

Reimplemented from BagOStuff.

Definition at line 145 of file MultiWriteBagOStuff.php.

References $value, and doWrite().

◆ lock()

MultiWriteBagOStuff::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 153 of file MultiWriteBagOStuff.php.

◆ makeGlobalKey()

MultiWriteBagOStuff::makeGlobalKey ( )

Make a global cache key.

Since: 1.27

Parameters

string $keys,... Key component

Returns: string

Reimplemented from BagOStuff.

Definition at line 240 of file MultiWriteBagOStuff.php.

Referenced by MultiWriteBagOStuffTest\testMakeGlobalKey().

◆ makeKey()

MultiWriteBagOStuff::makeKey ( )

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

Since: 1.27

Parameters

string $keys,... Key component

Returns: string

Reimplemented from BagOStuff.

Definition at line 236 of file MultiWriteBagOStuff.php.

Referenced by MultiWriteBagOStuffTest\testMakeKey().

◆ set()

MultiWriteBagOStuff::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 BagOStuff.

Definition at line 129 of file MultiWriteBagOStuff.php.

References $asyncWrites, $flags, $value, doWrite(), false, and BagOStuff\WRITE_SYNC.

◆ setDebug()

MultiWriteBagOStuff::setDebug ( $bool )

Parameters

bool $bool

Reimplemented from BagOStuff.

Definition at line 95 of file MultiWriteBagOStuff.php.

References $cache, $debug, and as.

◆ unlock()

MultiWriteBagOStuff::unlock ( $key )

Release an advisory lock on a key string.

Parameters

string $key

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 158 of file MultiWriteBagOStuff.php.

Member Data Documentation

◆ $asyncWrites

bool MultiWriteBagOStuff::$asyncWrites = false

protected

Use async secondary writes.

Definition at line 35 of file MultiWriteBagOStuff.php.

Referenced by doWrite(), and set().

◆ $caches

BagOStuff [] MultiWriteBagOStuff::$caches

protected

Definition at line 33 of file MultiWriteBagOStuff.php.

◆ ALL

const MultiWriteBagOStuff::ALL = INF

Idiom for "write to all backends".

Definition at line 38 of file MultiWriteBagOStuff.php.

◆ UPGRADE_TTL

const MultiWriteBagOStuff::UPGRADE_TTL = 3600

Definition at line 40 of file MultiWriteBagOStuff.php.

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

includes/libs/objectcache/MultiWriteBagOStuff.php

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ add()

◆ clearLastError()

◆ decr()

◆ delete()

◆ deleteObjectsExpiringBefore()

◆ doGet()

◆ doWrite()

◆ getLastError()

◆ incr()

◆ lock()

◆ makeGlobalKey()

◆ makeKey()

◆ set()

◆ setDebug()

◆ unlock()

Member Data Documentation

◆ $asyncWrites

◆ $caches

◆ ALL

◆ UPGRADE_TTL