Class representing a cache/ephemeral data store. More...

Inheritance diagram for BagOStuff:

[legend]

Collaboration diagram for BagOStuff:

[legend]

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

	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...

	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...

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

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

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

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

	getCurrentTime ()

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

	getLogger ()

	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...

	getSegmentationSize ()

	getSegmentedValueMaxSize ()

	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...

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

	makeGlobalKey ( $class,... $components)
	Make a global cache key. More...

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

	makeKeyInternal ( $keyspace, $components)
	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...

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

	setDebug ( $enabled)

	setLogger (LoggerInterface $logger)

	setMockTime (&$time)

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

	setNewPreparedValues (array $valueByKey)
	Prepare values for storage and get their serialized sizes, or, estimate those sizes. More...

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

Public Attributes
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...

Protected Member Functions
	fieldHasFlags ( $field, $flags)

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

Protected Attributes
callable null	$asyncHandler

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

bool	$debugMode = false

LoggerInterface	$logger

Private Attributes
float null	$wallClockOverride

Detailed Description

Class representing a cache/ephemeral data store.

This interface is intended to be more or less compatible with the PHP memcached client.

Instances of this class should be created with an intended access scope, such as:

a) A single PHP thread on a server (e.g. stored in a PHP variable)
b) A single application server (e.g. stored in APC or sqlite)
c) All application servers in datacenter (e.g. stored in memcached or mysql)
d) All application servers in all datacenters (e.g. stored via mcrouter or dynomite)

Callers should use the proper factory methods that yield BagOStuff instances. Site admins should make sure the configuration for those factory methods matches their access scope. BagOStuff subclasses have widely varying levels of support for replication features.

For any given instance, methods like lock(), unlock(), merge(), and set() with WRITE_SYNC should semantically operate over its entire access scope; any nodes/threads in that scope should serialize appropriately when using them. Likewise, a call to get() with READ_LATEST from one node in its access scope should reflect the prior changes of any other node its access scope. Any get() should reflect the changes of any prior set() with WRITE_SYNC.

Subclasses should override the default "segmentationSize" field with an appropriate value. The value should not be larger than what the storage backend (by default) supports. It also should be roughly informed by common performance bottlenecks (e.g. values over a certain size having poor scalability). The same goes for the "segmentedValueMaxSize" member, which limits the maximum size and chunk count (indirectly) of values.

Stable to extend

Definition at line 66 of file BagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

BagOStuff::__construct ( array $params = [] )

Parameters include:

logger: Psr\Log\LoggerInterface instance
asyncHandler: Callable to use for scheduling tasks after the web request ends. In CLI mode, it should run the task immediately.
Parameters

array $params -param array{logger?:Psr\Log\LoggerInterface,asyncHandler?:callable} $params

Reimplemented in WinCacheBagOStuff, MediumSpecificBagOStuff, EmptyBagOStuff, APCUBagOStuff, and MemcachedBagOStuff.

Definition at line 104 of file BagOStuff.php.

References setLogger().

Member Function Documentation

◆ add()

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

abstract

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 in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ addBusyCallback()

BagOStuff::addBusyCallback ( callable $workCallback )

abstract

Let a callback be run to avoid wasting time on special blocking calls.

The callbacks may or may not be called ever, in any particular order. They are likely to be invoked when something WRITE_SYNC is used used. They should follow a caching pattern as shown below, so that any code using the work will get it's result no matter what happens.

$result = null;
$workCallback = function () use ( &$result ) {
    if ( !$result ) {
        $result = ....
    }
    return $result;
}

Parameters

callable $workCallback

Since: 1.28

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by Wikimedia\Rdbms\ChronologyProtector\shutdown().

◆ changeTTL()

BagOStuff::changeTTL	(	$key,
		$exptime = `0`,
		$flags = `0`
	)

abstract

Change the expiration on a key if it exists.

If an expiry in the past is given then the key will immediately be expired

For large values written using WRITE_ALLOW_SEGMENTS, this only changes the TTL of the main segment list key. While lowering the TTL of the segment list key has the effect of functionally lowering the TTL of the key, it might leave unused blobs in cache for longer. Raising the TTL of such keys is not effective, since the expiration of a single segment key effectively expires the entire value.

Parameters

string	$key
int	$exptime	TTL or UNIX timestamp
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

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

Since: 1.28

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ changeTTLMulti()

BagOStuff::changeTTLMulti	(	array	$keys,
			$exptime,
			$flags = `0`
	)

abstract

Change the expiration of multiple keys that exist.

See also: BagOStuff::changeTTL()

Parameters

string[]	$keys	List of keys
int	$exptime	TTL or UNIX timestamp
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success

Since: 1.34

Reimplemented in SqlBagOStuff, ReplicatedBagOStuff, RedisBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ clearLastError()

BagOStuff::clearLastError ( )

abstract

Clear the "last error" registry.

Since: 1.23

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ decr()

BagOStuff::decr	(	$key,
		$value = `1`,
		$flags = `0`
	)

abstract

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

Parameters

string	$key
int	$value	Value to subtract from $key (default: 1) [optional]
int	$flags	Bit field of class WRITE_* constants [optional]

Returns: int|bool New value or false on failure

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, ReplicatedBagOStuff, RedisBagOStuff, MultiWriteBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, CachedBagOStuff, and APCUBagOStuff.

◆ delete()

BagOStuff::delete	(	$key,
		$flags = `0`
	)

abstract

Delete an item.

For large values written using WRITE_ALLOW_SEGMENTS, this only deletes the main segment list key unless WRITE_PRUNE_SEGMENTS is in the flags. While deleting the segment list key has the effect of functionally deleting the key, it leaves unused blobs in cache.

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 in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ deleteMulti()

BagOStuff::deleteMulti	(	array	$keys,
			$flags = `0`
	)

abstract

Batch deletion.

This does not support WRITE_ALLOW_SEGMENTS to avoid excessive read I/O

WRITE_BACKGROUND can be used for bulk deletion where the response is not vital

Parameters

string[]	$keys	List of keys
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success

Since: 1.33

Reimplemented in ReplicatedBagOStuff, MediumSpecificBagOStuff, CachedBagOStuff, and MultiWriteBagOStuff.

◆ deleteObjectsExpiringBefore()

BagOStuff::deleteObjectsExpiringBefore	(		$timestamp,
		callable	$progress = `null`,
			$limit = `INF`
	)

abstract

Delete all objects expiring before a certain date.

Parameters

string \| int	$timestamp	The reference date in MW or TS_UNIX format
callable \| null	$progress	Optional, a function which will be called regularly during long-running operations with the percentage progress as the first parameter. [optional]
int	$limit	Maximum number of keys to delete [default: INF]

Returns: bool Success; false if unimplemented

Reimplemented in SqlBagOStuff, ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ fieldHasFlags()

BagOStuff::fieldHasFlags	(	$field,
		$flags
	)

finalprotected

Parameters

int	$field
int	$flags

Returns: bool

Since: 1.34

Definition at line 510 of file BagOStuff.php.

Referenced by CachedBagOStuff\changeTTLMulti(), CachedBagOStuff\delete(), MediumSpecificBagOStuff\delete(), CachedBagOStuff\deleteMulti(), SqlBagOStuff\doCas(), MemcachedPeclBagOStuff\doDeleteMulti(), MemcachedPeclBagOStuff\doSetMulti(), MultiWriteBagOStuff\get(), ReplicatedBagOStuff\get(), ReplicatedBagOStuff\getMulti(), SqlBagOStuff\modifyMulti(), CachedBagOStuff\set(), CachedBagOStuff\setMulti(), and MultiWriteBagOStuff\usesAsyncWritesGivenFlags().

◆ get()

BagOStuff::get	(	$key,
		$flags = `0`
	)

abstract

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 in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by McTest\execute(), and Wikimedia\Rdbms\ChronologyProtector\shutdown().

◆ getCurrentTime()

BagOStuff::getCurrentTime ( )

Definition at line 567 of file BagOStuff.php.

Referenced by HashBagOStuff\expire(), SqlBagOStuff\expireAll(), MemcachedBagOStuff\fixExpiry(), SqlBagOStuff\getConnection(), SqlBagOStuff\getMaxDateTime(), getScopedLock(), ReplicatedBagOStuff\hadRecentSessionWrite(), SqlBagOStuff\isExpired(), SqlBagOStuff\markServerDown(), SqlBagOStuff\occasionallyGarbageCollect(), and ReplicatedBagOStuff\remarkRecentSessionWrite().

◆ getLastError()

BagOStuff::getLastError ( )

abstract

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

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

Since: 1.23

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ getLogger()

BagOStuff::getLogger ( )

Since: 1.35

Returns: LoggerInterface

Definition at line 121 of file BagOStuff.php.

References $logger.

◆ getMulti()

BagOStuff::getMulti	(	array	$keys,
			$flags = `0`
	)

abstract

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: mixed[] Map of (key => value) for existing keys

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ getQoS()

BagOStuff::getQoS ( $flag )

Parameters

int $flag ATTR_* class constant

Returns: int QOS_* class constant

Since: 1.28

Reimplemented in MediumSpecificBagOStuff.

Definition at line 484 of file BagOStuff.php.

Referenced by Wikimedia\Rdbms\ChronologyProtector\shutdown().

◆ getScopedLock()

BagOStuff::getScopedLock	(	$key,
		$timeout = `6`,
		$expiry = `30`,
		$rclass = `''`
	)

final

Get a lightweight exclusive self-unlocking lock.

Note that the same lock cannot be acquired twice.

This is useful for task de-duplication or to avoid obtrusive (though non-corrupting) DB errors like INSERT key conflicts or deadlocks when using LOCK IN SHARE MODE.

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: ScopedCallback|null Returns null on failure

Since: 1.26

Definition at line 289 of file BagOStuff.php.

References getCurrentTime(), lock(), and unlock().

◆ getSegmentationSize()

BagOStuff::getSegmentationSize ( )

Returns: int|float The chunk size, in bytes, of segmented objects (INF for no limit)

Since: 1.34

Reimplemented in MediumSpecificBagOStuff.

Definition at line 492 of file BagOStuff.php.

◆ getSegmentedValueMaxSize()

BagOStuff::getSegmentedValueMaxSize ( )

Returns: int|float Maximum total segmented object size in bytes (INF for no limit)

Since: 1.34

Reimplemented in MediumSpecificBagOStuff.

Definition at line 500 of file BagOStuff.php.

◆ getWithSetCallback()

BagOStuff::getWithSetCallback	(	$key,
		$exptime,
		$callback,
		$flags = `0`
	)

final

Get an item with the given key, regenerating and setting it if not found.

The callback can take $exptime as argument by reference and modify it. Nothing is stored nor deleted if the callback returns false.

Parameters

string	$key
int	$exptime	Time-to-live (seconds)
callable	$callback	Callback that derives the new value
int	$flags	Bitfield of BagOStuff::READ_* or BagOStuff::WRITE_* constants [optional]

Returns: mixed The cached value if found or the result of $callback otherwise

Since: 1.27

Definition at line 145 of file BagOStuff.php.

◆ incr()

BagOStuff::incr	(	$key,
		$value = `1`,
		$flags = `0`
	)

abstract

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]
int	$flags	Bit field of class WRITE_* constants [optional]

Returns: int|bool New value or false on failure

Reimplemented in WinCacheBagOStuff, RESTBagOStuff, ReplicatedBagOStuff, RedisBagOStuff, MultiWriteBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, CachedBagOStuff, APCUBagOStuff, and SqlBagOStuff.

◆ incrWithInit()

BagOStuff::incrWithInit	(	$key,
		$exptime,
		$value = `1`,
		$init = `null`,
		$flags = `0`
	)

abstract

Increase the value of the given key (no TTL change) if it exists or create it otherwise.

This will create the key with the value $init and TTL $exptime instead if not present. Callers should make sure that both ($init - $value) and $exptime are invariants for all operations to any given key. The value of $init should be at least that of $value.

Parameters

string	$key	Key built via makeKey() or makeGlobalKey()
int	$exptime	Time-to-live (in seconds) or a UNIX timestamp expiration
int	$value	Amount to increase the key value by [default: 1]
int \| null	$init	Value to initialize the key to if it does not exist [default: $value]
int	$flags	Bit field of class WRITE_* constants [optional]

Returns: int|bool New value or false on failure

Since: 1.24

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, EmptyBagOStuff, CachedBagOStuff, and APCUBagOStuff.

◆ lock()

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

abstract

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 in SqlBagOStuff, ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by getScopedLock(), and Wikimedia\Rdbms\ChronologyProtector\shutdown().

◆ makeGlobalKey()

BagOStuff::makeGlobalKey	(	$class,
		$components
	)

abstract

Make a global cache key.

Since: 1.27

Parameters

string	$class	Key class
	string\|int	...$components Key components (starting with a key collection name)

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

Implements IStoreKeyEncoder.

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by Wikimedia\Rdbms\ChronologyProtector\__construct(), and Wikimedia\Rdbms\ChronologyProtector\getTouchedKey().

◆ makeKey()

BagOStuff::makeKey	(	$class,
		$components
	)

abstract

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

Since: 1.27

Parameters

string	$class	Key class
	string\|int	...$components Key components (starting with a key collection name)

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

Implements IStoreKeyEncoder.

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by CryptHKDF\__construct(), UploadBase\getUploadSessionKey(), and ExtensionRegistry\makeCacheKey().

◆ makeKeyInternal()

BagOStuff::makeKeyInternal	(	$keyspace,
		$components
	)

abstract

Construct a cache key.

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, ReplicatedBagOStuff, MultiWriteBagOStuff, MemcachedBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ merge()

BagOStuff::merge	(		$key,
		callable	$callback,
			$exptime = `0`,
			$attempts = `10`,
			$flags = `0`
	)

abstract

Merge changes into the existing cache value (possibly creating a new one)

The callback function returns the new value given the current value (which will be false if not present), and takes the arguments: (this BagOStuff, cache key, current value, TTL). The TTL parameter is reference set to $exptime. It can be overriden in the callback. Nothing is stored nor deleted if the callback returns false.

Parameters

string	$key
callable	$callback	Callback method to be executed
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$attempts	The amount of times to attempt a merge in case of failure
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success

Exceptions

InvalidArgumentException

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, EmptyBagOStuff, and CachedBagOStuff.

◆ mergeFlagMaps()

BagOStuff::mergeFlagMaps ( array $bags )

finalprotected

Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map.

Parameters

BagOStuff[] $bags

Returns: int[] Resulting flag map (class ATTR_* constant => class QOS_* constant)

Definition at line 520 of file BagOStuff.php.

Referenced by MultiWriteBagOStuff\__construct(), and ReplicatedBagOStuff\__construct().

◆ set()

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

abstract

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 in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by Wikimedia\Rdbms\ChronologyProtector\shutdown().

◆ setDebug()

BagOStuff::setDebug ( $enabled )

Parameters

bool $enabled

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MemcachedPhpBagOStuff, and CachedBagOStuff.

Definition at line 128 of file BagOStuff.php.

◆ setLogger()

BagOStuff::setLogger ( LoggerInterface $logger )

Parameters

LoggerInterface $logger

Returns: void

Reimplemented in RESTBagOStuff.

Definition at line 113 of file BagOStuff.php.

References $logger.

Referenced by __construct().

◆ setMockTime()

BagOStuff::setMockTime ( & $time )

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, and CachedBagOStuff.

Definition at line 576 of file BagOStuff.php.

◆ setMulti()

BagOStuff::setMulti	(	array	$data,
			$exptime = `0`,
			$flags = `0`
	)

abstract

Batch insertion/replace.

This does not support WRITE_ALLOW_SEGMENTS to avoid excessive read I/O

WRITE_BACKGROUND can be used for bulk insertion where the response is not vital

Parameters

mixed[]	$data	Map of (key => value)
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success

Since: 1.24

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

◆ setNewPreparedValues()

BagOStuff::setNewPreparedValues ( array $valueByKey )

abstract

Prepare values for storage and get their serialized sizes, or, estimate those sizes.

All previously prepared values will be cleared. Each of the new prepared values will be individually cleared as they get used by write operations for that key. This is done to avoid unchecked growth in PHP memory usage.

Example usage:

$valueByKey = [ $key1 => $value1, $key2 => $value2, $key3 => $value3 ];
$cache->setNewPreparedValues( $valueByKey );
$cache->set( $key1, $value1, $cache::TTL_HOUR );
$cache->setMulti( [ $key2 => $value2, $key3 => $value3 ], $cache::TTL_HOUR );

This is only useful if the caller needs an estimate of the serialized object sizes. The caller cannot know the serialization format and even if it did, it could be expensive to serialize complex values twice just to get the size information before writing them to cache. This method solves both problems by making the cache instance do the serialization and having it reuse the result when the cache write happens.

Parameters

array $valueByKey Map of (cache key => PHP variable value to serialize)

Returns: int[]|null[] Corresponding list of size estimates (null for invalid values)

Since: 1.35

Reimplemented in ReplicatedBagOStuff, MultiWriteBagOStuff, MemcachedPeclBagOStuff, MediumSpecificBagOStuff, HashBagOStuff, and CachedBagOStuff.

◆ unlock()

BagOStuff::unlock ( $key )

abstract

Release an advisory lock on a key string.

Parameters

string $key

Returns: bool Success

Reimplemented in SqlBagOStuff, ReplicatedBagOStuff, MultiWriteBagOStuff, MediumSpecificBagOStuff, and CachedBagOStuff.

Referenced by getScopedLock(), and Wikimedia\Rdbms\ChronologyProtector\shutdown().

Member Data Documentation

◆ $asyncHandler

callable null BagOStuff::$asyncHandler

protected

Definition at line 76 of file BagOStuff.php.

Referenced by MultiWriteBagOStuff\doWrite(), and SqlBagOStuff\occasionallyGarbageCollect().

◆ $attrMap

int [] BagOStuff::$attrMap = []

protected

Map of (ATTR_* class constant => QOS_* class constant)

Definition at line 78 of file BagOStuff.php.

◆ $debugMode

bool BagOStuff::$debugMode = false

protected

Definition at line 81 of file BagOStuff.php.

◆ $logger

LoggerInterface BagOStuff::$logger

protected

Definition at line 73 of file BagOStuff.php.

Referenced by MultiWriteBagOStuff\doWrite(), getLogger(), setLogger(), and RESTBagOStuff\setLogger().

◆ $wallClockOverride

float null BagOStuff::$wallClockOverride

private

Definition at line 84 of file BagOStuff.php.

◆ READ_LATEST

const BagOStuff::READ_LATEST = 1

Bitfield constants for get()/getMulti(); these are only advisory.

Definition at line 87 of file BagOStuff.php.

Referenced by RESTBagOStuff\incr().

◆ READ_VERIFIED

const BagOStuff::READ_VERIFIED = 2

Definition at line 88 of file BagOStuff.php.

Referenced by ParserCache\get(), and ParserCache\getMetadata().

◆ WRITE_ALLOW_SEGMENTS

const BagOStuff::WRITE_ALLOW_SEGMENTS = 16

Definition at line 92 of file BagOStuff.php.

Referenced by ParserCache\save(), MediaWiki\Storage\PageEditStash\stashInputText(), and MediaWiki\Storage\PageEditStash\storeStashValue().

◆ WRITE_BACKGROUND

const BagOStuff::WRITE_BACKGROUND = 64

Definition at line 94 of file BagOStuff.php.

Referenced by Wikimedia\DependencyStore\KeyValueDependencyStore\remove(), Wikimedia\DependencyStore\KeyValueDependencyStore\renew(), and Wikimedia\DependencyStore\KeyValueDependencyStore\storeMulti().

◆ WRITE_CACHE_ONLY

const BagOStuff::WRITE_CACHE_ONLY = 8

Definition at line 91 of file BagOStuff.php.

Referenced by CachedBagOStuff\get(), and MediaWiki\Session\SessionBackend\save().

◆ WRITE_PRUNE_SEGMENTS

const BagOStuff::WRITE_PRUNE_SEGMENTS = 32

Definition at line 93 of file BagOStuff.php.

Referenced by MediaWiki\Storage\PageEditStash\pruneExcessStashedEntries().

◆ WRITE_SYNC

const BagOStuff::WRITE_SYNC = 4

Bitfield constants for set()/merge(); these are only advisory.

Definition at line 90 of file BagOStuff.php.

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

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

includes/libs/objectcache/BagOStuff.php

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ add()

◆ addBusyCallback()

◆ changeTTL()

◆ changeTTLMulti()

◆ clearLastError()

◆ decr()

◆ delete()

◆ deleteMulti()

◆ deleteObjectsExpiringBefore()

◆ fieldHasFlags()

◆ get()

◆ getCurrentTime()

◆ getLastError()

◆ getLogger()

◆ getMulti()

◆ getQoS()

◆ getScopedLock()

◆ getSegmentationSize()

◆ getSegmentedValueMaxSize()

◆ getWithSetCallback()

◆ incr()

◆ incrWithInit()

◆ lock()

◆ makeGlobalKey()

◆ makeKey()

◆ makeKeyInternal()

◆ merge()

◆ mergeFlagMaps()

◆ set()

◆ setDebug()

◆ setLogger()

◆ setMockTime()

◆ setMulti()

◆ setNewPreparedValues()

◆ unlock()

Member Data Documentation

◆ $asyncHandler

◆ $attrMap

◆ $debugMode

◆ $logger

◆ $wallClockOverride

◆ READ_LATEST

◆ READ_VERIFIED

◆ WRITE_ALLOW_SEGMENTS

◆ WRITE_BACKGROUND

◆ WRITE_CACHE_ONLY

◆ WRITE_PRUNE_SEGMENTS

◆ WRITE_SYNC