A wrapper class for the pure-PHP memcached client, exposing a BagOStuff interface. More...

Collaboration diagram for MemcachedPhpBagOStuff:

[legend]

Public Member Functions
	__construct ( $params)
	Available parameters are:

Public Member Functions inherited from MemcachedBagOStuff
	__construct (array $params)

	validateKeyEncoding ( $key)
	Ensure that a key is safe to use (contains no control characters and no characters above the ASCII range.)

Public Member Functions inherited from MediumSpecificBagOStuff
	add ( $key, $value, $exptime=0, $flags=0)
	Insert an item if it does not already exist.

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

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

	changeTTLMulti (array $keys, $exptime, $flags=0)
	Change the expiration of multiple keys that exist.

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

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

	deleteObjectsExpiringBefore ( $timestamp, callable $progress=null, $limit=INF, string $tag=null)
	Delete all objects expiring before a certain date.

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

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

	getQoS ( $flag)

	getSegmentationSize ()

	getSegmentedValueMaxSize ()

	incrWithInit ( $key, $exptime, $step=1, $init=null, $flags=0)
	Increase the value of the given key (no TTL change) if it exists or create it otherwise.

	lock ( $key, $timeout=6, $exptime=6, $rclass='')

	makeGlobalKey ( $collection,... $components)
	Make a cache key for the default keyspace and given components.

	makeKey ( $collection,... $components)
	Make a cache key for the global keyspace and given components.

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

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

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

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

Public Member Functions inherited from BagOStuff
	clearLastError ()
	Clear the "last error" registry.

	getCurrentTime ()

	getLastError ( $watchPoint=0)
	Get the "last error" registry.

	getLogger ()

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

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

	isKeyGlobal ( $key)
	Check whether a cache key is in the global keyspace.

	registerWrapperInfoForStats (string $prefixComponent, string $statsGroup, callable $collectionCallback)
	Register info about a caching layer class that uses BagOStuff as a backing store.

	setLogger (LoggerInterface $logger)

	setMockTime (&$time)

	setNewPreparedValues (array $valueByKey)
	Stage a set of new key values for storage and estimate the amount of bytes needed.

	watchErrors ()
	Get a "watch point" token that can be used to get the "last error" to occur after now.

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

	doCas ( $casToken, $key, $value, $exptime=0, $flags=0)
	Set an item if the current CAS token matches the provided CAS token.

	doChangeTTL ( $key, $exptime, $flags)

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

	doGet ( $key, $flags=0, &$casToken=null)
	Get an item.

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

	doIncrWithInitAsync ( $key, $exptime, $step, $init)

	doIncrWithInitSync ( $key, $exptime, $step, $init)

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

	serialize ( $value)

	unserialize ( $value)

Protected Member Functions inherited from MemcachedBagOStuff
	doIncrWithInit ( $key, $exptime, $step, $init, $flags)

	fixExpiry ( $exptime)

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

	stripRouteFromKey ( $key)

	validateKeyAndPrependRoute ( $key)

Protected Member Functions inherited from MediumSpecificBagOStuff
	cas ( $casToken, $key, $value, $exptime=0, $flags=0)
	Set an item if the current CAS token matches the provided CAS token.

	convertGenericKey ( $key)
	Convert a "generic" reversible cache key into one for this cache.

	debug ( $text)

	doChangeTTLMulti (array $keys, $exptime, $flags=0)

	doDeleteMulti (array $keys, $flags=0)

	doLock ( $key, $timeout, $exptime)

	doSetMulti (array $data, $exptime=0, $flags=0)

	doUnlock ( $key)

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

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

	getSerialized ( $value, $key)
	Get the serialized form a value, logging a warning if it involves custom classes.

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

	isRelativeExpiration ( $exptime)

	makeLockKey ( $key)

	makeValueOrSegmentList ( $key, $value, $exptime, $flags, &$ok)
	Make the entry to store at a key (inline or segment list), storing any segments.

	mergeViaCas ( $key, callable $callback, $exptime, $attempts, $flags)

	resolveSegments ( $key, $mainValue)
	Get and reassemble the chunks of blob at the given key.

	tokensMatch ( $value, $otherValue)

	updateOpStats (string $op, array $keyInfo)

Protected Member Functions inherited from BagOStuff
	componentsFromGenericKey ( $key)
	Extract the components from a "generic" reversible cache key.

	determineKeyPrefixForStats ( $key)

	fieldHasFlags ( $field, $flags)

	genericKeyFromComponents (... $components)
	At a minimum, there must be a keyspace and collection name component.

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

	proxyCall (string $method, int $arg0Sig, int $resSig, array $genericArgs, BagOStuff $wrapper)
	Call a method on behalf of wrapper BagOStuff instance that uses "generic" keys.

	setLastError ( $error)
	Set the "last error" registry due to a problem encountered during an attempted operation.

Protected Attributes
MemcachedClient	$client

Protected Attributes inherited from MemcachedBagOStuff
string	$routingPrefix
	Routing prefix appended to keys during operations.

Protected Attributes inherited from MediumSpecificBagOStuff
array< string, array >	$locks = []
	Map of (key => (class LOCK_* constant => value)

float	$maxLockSendDelay = 0.05
	Seconds; maximum expected seconds for a lock ping to reach the backend.

int	$segmentationSize
	Bytes; chunk size of segmented cache values.

int	$segmentedValueMaxSize
	Bytes; maximum total size of a segmented cache value.

const	LOCK_DEPTH = 1

const	LOCK_EXPIRY = 3

const	LOCK_RCLASS = 0

const	LOCK_TIME = 2

const	METRIC_OP_ADD = 'add'

const	METRIC_OP_CAS = 'cas'

const	METRIC_OP_CHANGE_TTL = 'change_ttl'

const	METRIC_OP_DECR = 'decr'

const	METRIC_OP_DELETE = 'delete'

const	METRIC_OP_GET = 'get'

const	METRIC_OP_INCR = 'incr'

const	METRIC_OP_SET = 'set'

const	PASS_BY_REF = -1
	Idiom for doGet() to return extra information by reference.

Protected Attributes inherited from BagOStuff
callable null	$asyncHandler

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

string	$keyspace
	Default keyspace; used by makeKey()

int	$lastError = self::ERR_NONE
	BagOStuff:ERR_* constant of the last error that occurred.

int	$lastErrorId = 0
	Error event sequence number of the last error that occurred.

LoggerInterface	$logger

StatsdDataFactoryInterface	$stats

array< string, array >	$wrapperInfoByPrefix = []
	Cache key processing callbacks and info for metrics.

Additional Inherited Members
Public Attributes inherited from BagOStuff
const	MAX_CONFLICTS_ONE = 1
	Abort after the first merge conflict.

const	READ_LATEST = 1
	Bitfield constants for get()/getMulti(); these are only advisory.

const	READ_VERIFIED = 2
	Promise that the caller handles detection of staleness.

const	WRITE_ALLOW_SEGMENTS = 16
	Allow partitioning of the value if it is a large string.

const	WRITE_BACKGROUND = 64
	If supported, do not block on write operation completion; instead, treat writes as succesful based on whether they could be buffered.

const	WRITE_CACHE_ONLY = 8
	Bitfield constants for set()/merge(); these are only advisory.

const	WRITE_PRUNE_SEGMENTS = 32
	Delete all the segments if the value is partitioned.

Public Attributes inherited from Wikimedia\LightweightObjectStore\StorageAwareness
const	ATTR_DURABILITY = 2
	Durability of writes; see QOS_DURABILITY_* (higher means stronger)

const	ATTR_EMULATION = 1
	Emulation/fallback mode; see QOS_EMULATION_*; higher is better.

const	ERR_NO_RESPONSE = 1
	Storage medium failed to yield a complete response to an operation.

const	ERR_NONE = 0
	No storage medium error.

const	ERR_UNEXPECTED = 3
	Storage medium operation failed due to usage limitations or an I/O error.

const	ERR_UNREACHABLE = 2
	Storage medium could not be reached to establish a connection.

const	QOS_DURABILITY_DISK = 4
	Data is saved to disk and writes do not usually block on fsync()

const	QOS_DURABILITY_NONE = 1
	Data is never saved to begin with (blackhole store)

const	QOS_DURABILITY_RDBMS = 5
	Data is saved to disk and writes usually block on fsync(), like a standard RDBMS.

const	QOS_DURABILITY_SCRIPT = 2
	Data is lost at the end of the current web request or CLI script.

const	QOS_DURABILITY_SERVICE = 3
	Data is lost once the service storing the data restarts.

const	QOS_EMULATION_SQL = 1
	Fallback disk-based SQL store.

const	QOS_UNKNOWN = INF
	Generic "unknown" value; useful for comparisons (always "good enough")

Static Protected Attributes inherited from BagOStuff
static int	$nextErrorMonitorId = 1
	Next sequence number to use for watch/error events.

Detailed Description

A wrapper class for the pure-PHP memcached client, exposing a BagOStuff interface.

Definition at line 29 of file MemcachedPhpBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

MemcachedPhpBagOStuff::__construct ( $params )

Available parameters are:

servers: The list of IP:port combinations holding the memcached servers.
persistent: Whether to use a persistent connection
compress_threshold: The minimum size an object must be before it is compressed
timeout: The read timeout in microseconds
connect_timeout: The connect timeout in seconds

Parameters

array $params

Definition at line 43 of file MemcachedPhpBagOStuff.php.

Member Function Documentation

◆ doAdd()

MemcachedPhpBagOStuff::doAdd	(	$key,
		$value,
		$exptime = 0,
		$flags = 0 )

protected

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 MediumSpecificBagOStuff.

Definition at line 101 of file MemcachedPhpBagOStuff.php.

References $res, MemcachedBagOStuff\fixExpiry(), BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doCas()

MemcachedPhpBagOStuff::doCas	(	$casToken,
		$key,
		$value,
		$exptime = 0,
		$flags = 0 )

protected

Set an item if the current CAS token matches the provided CAS token.

Parameters

mixed	$casToken	CAS token from an existing version of the key
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 MediumSpecificBagOStuff.

Definition at line 113 of file MemcachedPhpBagOStuff.php.

References $res, MemcachedBagOStuff\fixExpiry(), BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doChangeTTL()

MemcachedPhpBagOStuff::doChangeTTL	(	$key,
		$exptime,
		$flags )

protected

Parameters

string	$key
int	$exptime
int	$flags

Returns: bool

Reimplemented from MediumSpecificBagOStuff.

Definition at line 151 of file MemcachedPhpBagOStuff.php.

References $res, MemcachedBagOStuff\fixExpiry(), BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doDelete()

MemcachedPhpBagOStuff::doDelete	(		$key,
			$flags = 0 )

protected

Delete an item.

Parameters

string	$key
int	$flags	Bitfield of BagOStuff::WRITE_* constants

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

Reimplemented from MediumSpecificBagOStuff.

Definition at line 89 of file MemcachedPhpBagOStuff.php.

References $res, BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doGet()

MemcachedPhpBagOStuff::doGet	(		$key,
			$flags = 0,
		&	$casToken = null )

protected

Get an item.

The CAS token should be null if the key does not exist or the value is corrupt

Parameters

string	$key
int	$flags	Bitfield of BagOStuff::READ_* constants [optional]
mixed	&$casToken	CAS token if MediumSpecificBagOStuff::PASS_BY_REF [returned]

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

Reimplemented from MediumSpecificBagOStuff.

Definition at line 58 of file MemcachedPhpBagOStuff.php.

References $res, BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doGetMulti()

MemcachedPhpBagOStuff::doGetMulti	(	array	$keys,
			$flags = 0 )

protected

Get an associative array containing the item for each of the keys that have items.

Parameters

string[]	$keys	List of keys
int	$flags	Bitfield; supports READ_LATEST [optional]

Returns: array Map of (key => value) for existing keys; preserves the order of $keys

Reimplemented from MediumSpecificBagOStuff.

Definition at line 163 of file MemcachedPhpBagOStuff.php.

References $keys, $res, BagOStuff\setLastError(), MemcachedBagOStuff\stripRouteFromKey(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ doIncrWithInitAsync()

MemcachedPhpBagOStuff::doIncrWithInitAsync	(	$key,
		$exptime,
		$step,
		$init )

protected

Parameters

string	$key
int	$exptime
int	$step
int	$init

Returns: bool True on success, false on failure

Reimplemented from MemcachedBagOStuff.

Definition at line 125 of file MemcachedPhpBagOStuff.php.

References MemcachedBagOStuff\fixExpiry(), BagOStuff\getLastError(), MemcachedBagOStuff\validateKeyAndPrependRoute(), and BagOStuff\watchErrors().

◆ doIncrWithInitSync()

MemcachedPhpBagOStuff::doIncrWithInitSync	(	$key,
		$exptime,
		$step,
		$init )

protected

Parameters

string	$key
int	$exptime
int	$step
int	$init

Returns: int|bool New value or false on failure

Reimplemented from MemcachedBagOStuff.

Definition at line 133 of file MemcachedPhpBagOStuff.php.

References $success, MemcachedBagOStuff\fixExpiry(), BagOStuff\getLastError(), MemcachedBagOStuff\validateKeyAndPrependRoute(), and BagOStuff\watchErrors().

◆ doSet()

MemcachedPhpBagOStuff::doSet	(	$key,
		$value,
		$exptime = 0,
		$flags = 0 )

protected

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 MediumSpecificBagOStuff.

Definition at line 77 of file MemcachedPhpBagOStuff.php.

References $res, MemcachedBagOStuff\fixExpiry(), BagOStuff\setLastError(), and MemcachedBagOStuff\validateKeyAndPrependRoute().

◆ serialize()

MemcachedPhpBagOStuff::serialize ( $value )

protected

Parameters

mixed $value

Returns: string|int|false String/integer representation

Note: Special handling is usually needed for integers so incr()/decr() work

Reimplemented from MediumSpecificBagOStuff.

Definition at line 183 of file MemcachedPhpBagOStuff.php.

◆ unserialize()

MemcachedPhpBagOStuff::unserialize ( $value )

protected

Parameters

string | int | false $value

Returns: mixed Original value or false on error

Note: Special handling is usually needed for integers so incr()/decr() work

Reimplemented from MediumSpecificBagOStuff.

Definition at line 187 of file MemcachedPhpBagOStuff.php.

References MediumSpecificBagOStuff\isInteger().

Member Data Documentation

◆ $client

MemcachedClient MemcachedPhpBagOStuff::$client

protected

Definition at line 31 of file MemcachedPhpBagOStuff.php.

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

includes/libs/objectcache/MemcachedPhpBagOStuff.php

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ doAdd()

◆ doCas()

◆ doChangeTTL()

◆ doDelete()

◆ doGet()

◆ doGetMulti()

◆ doIncrWithInitAsync()

◆ doIncrWithInitSync()

◆ doSet()

◆ serialize()

◆ unserialize()

Member Data Documentation

◆ $client