Base class for memcached clients. More...

Inheritance diagram for MemcachedBagOStuff:

[legend]

Collaboration diagram for MemcachedBagOStuff:

[legend]

Public Member Functions
	__construct (array $params)

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

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

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

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

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

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

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

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

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

	get ( $key, $flags=0)
	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)

	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. More...

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

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

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

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

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

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

	setNewPreparedValues (array $valueByKey)
	Make a "generic" reversible cache key from the given components. More...

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

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

	decr ( $key, $value=1, $flags=0)
	Decrease stored value of $key by $value while preserving its TTL. More...

	getCurrentTime ()

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

	getLogger ()

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

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

	incr ( $key, $value=1, $flags=0)
	Increase stored value of $key by $value while preserving its TTL. More...

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

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

	setLogger (LoggerInterface $logger)

	setMockTime (&$time)

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

Protected Member Functions
	fixExpiry ( $exptime)

	stripRouteFromKey ( $key)

	validateKeyAndPrependRoute ( $key)

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

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

	debug ( $text)

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

	doCas ( $casToken, $key, $value, $exptime=0, $flags=0)
	Check and set an item. More...

	doChangeTTL ( $key, $exptime, $flags)

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

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

	doDeleteMulti (array $keys, $flags=0)

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

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

	doIncrWithInit ( $key, $exptime, $step, $init, $flags)

	doLock ( $key, $timeout, $exptime)

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

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

	doUnlock ( $key)

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

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

	getSerialized ( $value, $key)
	Get the serialized form a value, using any applicable prepared value. More...

	guessSerialValueSize ( $value, $depth=0, &$loops=0)
	Estimate the size of a variable once serialized. More...

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

	isRelativeExpiration ( $exptime)

	makeLockKey ( $key)

	makeValueOrSegmentList ( $key, $value, $exptime, $flags)
	Determine the entry (inline or segment list) to store under a key to save the value. More...

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

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

	serialize ( $value)

	unserialize ( $value)

	updateOpStats (string $op, array $keyInfo)

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

	determineKeyPrefixForStats ( $key)

	fieldHasFlags ( $field, $flags)

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

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

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

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

Protected Attributes
string	$routingPrefix
	Routing prefix appended to keys during operations. More...

Protected Attributes inherited from MediumSpecificBagOStuff
callable[]	$busyCallbacks = []

array< string, array >	$locks = []
	Map of (key => (class, depth, expiry) More...

array[]	$preparedValues = []
	Map of (key => (PHP variable value, serialized value)) More...

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

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

int	$syncTimeout
	Seconds. More...

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'

Protected Attributes inherited from BagOStuff
callable null	$asyncHandler

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

string	$keyspace
	Default keyspace; used by makeKey() More...

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

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

LoggerInterface	$logger

StatsdDataFactoryInterface	$stats

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

Additional Inherited Members
Public Attributes inherited from BagOStuff
const	READ_LATEST = 1
	Bitfield constants for get()/getMulti(); these are only advisory. More...

const	READ_VERIFIED = 2

const	WRITE_ALLOW_SEGMENTS = 16

const	WRITE_BACKGROUND = 64

const	WRITE_CACHE_ONLY = 8

const	WRITE_PRUNE_SEGMENTS = 32

const	WRITE_SYNC = 4
	Bitfield constants for set()/merge(); these are only advisory. More...

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

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

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

const	ERR_NONE = 0
	No storage medium error. More...

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

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

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

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

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

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

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

const	QOS_EMULATION_SQL = 1
	Fallback disk-based SQL store. More...

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

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

Detailed Description

Base class for memcached clients.

Definition at line 29 of file MemcachedBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

MemcachedBagOStuff::__construct ( array $params )

Parameters

array

$params

Additional parameters include:

routingPrefix: a routing prefix of the form "<datacenter>/<cluster>/" used to convey the location/strategy to use for handling keys accessed from this instance. The prefix is prepended to keys during cache operations. The memcached proxy must preserve these prefixes in any responses that include requested keys (e.g. get/gets). The proxy is also assumed to strip the routing prefix from the stored key name, which allows for unprefixed access. This can be used with mcrouter. [optional]

Reimplemented from MediumSpecificBagOStuff.

Definition at line 42 of file MemcachedBagOStuff.php.

References Wikimedia\LightweightObjectStore\StorageAwareness\ATTR_DURABILITY, and Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_SERVICE.

Member Function Documentation

◆ fixExpiry()

MemcachedBagOStuff::fixExpiry ( $exptime )

protected

Parameters

int | float $exptime

Returns: int

Definition at line 149 of file MemcachedBagOStuff.php.

References BagOStuff\getCurrentTime(), and MediumSpecificBagOStuff\isRelativeExpiration().

Referenced by MemcachedPeclBagOStuff\doAdd(), MemcachedPhpBagOStuff\doAdd(), MemcachedPeclBagOStuff\doCas(), MemcachedPhpBagOStuff\doCas(), MemcachedPeclBagOStuff\doChangeTTL(), MemcachedPhpBagOStuff\doChangeTTL(), MemcachedPeclBagOStuff\doIncrWithInit(), MemcachedPhpBagOStuff\doIncrWithInit(), MemcachedPeclBagOStuff\doSet(), MemcachedPhpBagOStuff\doSet(), and MemcachedPeclBagOStuff\doSetMulti().

◆ makeKeyInternal()

MemcachedBagOStuff::makeKeyInternal	(	$keyspace,
		$components
	)

Construct a cache key.

Since: 1.27

Parameters

string	$keyspace
array	$components

Returns: string

Reimplemented from BagOStuff.

Definition at line 60 of file MemcachedBagOStuff.php.

References BagOStuff\$keyspace.

◆ stripRouteFromKey()

MemcachedBagOStuff::stripRouteFromKey ( $key )

protected

Parameters

string $key

Returns: string

Definition at line 132 of file MemcachedBagOStuff.php.

Referenced by MemcachedPeclBagOStuff\doGetMulti(), and MemcachedPhpBagOStuff\doGetMulti().

◆ validateKeyAndPrependRoute()

MemcachedBagOStuff::validateKeyAndPrependRoute ( $key )

protected

Parameters

string $key

Returns: string

Definition at line 114 of file MemcachedBagOStuff.php.

References validateKeyEncoding().

◆ validateKeyEncoding()

MemcachedBagOStuff::validateKeyEncoding ( $key )

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

Parameters

string $key

Returns: string

Exceptions

Exception

Definition at line 102 of file MemcachedBagOStuff.php.

Referenced by validateKeyAndPrependRoute().

Member Data Documentation

◆ $routingPrefix

string MemcachedBagOStuff::$routingPrefix

protected

Routing prefix appended to keys during operations.

Definition at line 31 of file MemcachedBagOStuff.php.

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

includes/libs/objectcache/MemcachedBagOStuff.php

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ fixExpiry()

◆ makeKeyInternal()

◆ stripRouteFromKey()

◆ validateKeyAndPrependRoute()

◆ validateKeyEncoding()

Member Data Documentation

◆ $routingPrefix