RDBMS-based caching module. More...

Inheritance diagram for SqlBagOStuff:

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Collaboration diagram for SqlBagOStuff:

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Public Member Functions
	__construct ( $params)
	Create a new backend instance from parameters injected by ObjectCache::newFromParams()

	createTables ()
	Create the shard tables on all databases.

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

	deleteAll ()
	Delete content of shard tables in every server.

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

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

	doLock ( $key, $timeout=6, $exptime=6)

	doUnlock ( $key)

	expireAll ()

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

	makeKeyInternal ( $keyspace, $components)
	Make a cache key for the given keyspace and components.

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

	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.

	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.

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

	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, $expiry=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)

	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.

	doDeleteMulti (array $keys, $flags=0)

	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.

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

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

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

	serialize ( $value)

	unserialize ( $value)

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)

	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, using any applicable prepared value.

	guessSerialSizeOfValues (array $values)
	Estimate the size of a each variable once serialized.

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

	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
Exception[]	$connFailureErrors = []
	Map of (shard index => Exception)

float[]	$connFailureTimes = []
	Map of (shard index => UNIX timestamps)

IMaintainableDatabase[]	$conns
	Map of (shard index => DB handle)

string false null	$dbDomain
	DB name used for keys using the LoadBalancer.

float	$lastGarbageCollect = 0
	UNIX timestamp.

ILoadBalancer null	$loadBalancer

callable null	$loadBalancerCallback
	Injected function which returns a LoadBalancer.

bool	$multiPrimaryMode
	Whether multi-primary mode is enabled.

int	$numTableShards = 1
	Number of table shards to use on each server.

int	$purgeLimit = 100
	Max expired rows to purge during randomized garbage collection.

int	$purgePeriod = 10
	Average number of writes required to trigger garbage collection.

bool	$replicaOnly
	Whether to use replicas instead of primaries (if using LoadBalancer)

array[]	$serverInfos = []
	(server index => server config)

string[]	$serverTags = []
	(server index => tag/host name)

string	$tableName = 'objectcache'

bool	$useLB = false
	Whether to use the LoadBalancer.

int	$writeBatchSize = 100

Protected Attributes inherited from MediumSpecificBagOStuff
array< string, array >	$locks = []
	Map of (key => (class, depth, expiry)

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

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

RDBMS-based caching module.

The following database sharding schemes are supported:

None; all keys map to the same shard
Hash; keys map to shards via consistent hashing

The following database replication topologies are supported:

A primary database server for each shard, all within one datacenter
A co-primary database server for each shard within each datacenter

Definition at line 50 of file SqlBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

SqlBagOStuff::__construct ( $params )

Create a new backend instance from parameters injected by ObjectCache::newFromParams()

The database servers must be provided by either the "server" parameter, the "servers" parameter or the "loadBalancer" parameter.

The parameters are as described at \\MediaWiki\\MainConfigSchema::ObjectCaches except that:

the configured "cluster" and main LB fallback modes are implemented by the wiring by passing "loadBalancerCallback".
"dbDomain" is required if "loadBalancerCallback" is set, whereas in config it may be absent.

Access: internal

Parameters

array

$params

server: string
servers: string[]
loadBalancerCallback: A closure which provides a LoadBalancer object
- dbDomain: string|false
multiPrimaryMode: bool
purgePeriod: int|float
purgeLimit: int
tableName: string
shards: int
replicaOnly: bool
writeBatchSize: int

Definition at line 143 of file SqlBagOStuff.php.

Member Function Documentation

◆ createTables()

SqlBagOStuff::createTables ( )

Create the shard tables on all databases.

This is typically called manually by a sysadmin via eval.php, e.g. for ParserCache:

ObjectCache::getInstance( 'myparsercache' )->createTables();

This is different from $services->getParserCache()->getCacheStorage()->createTables(), which would use the backend set via $wgParserCacheType, which shouldn't be set yet for the backend you are creating shard tables on. The expectation is to first add the new backend to $wgObjectCaches, run the above, and then enable it for live ParserCache traffic by setting $wgParserCacheType.

Definition at line 1821 of file SqlBagOStuff.php.

References Wikimedia\Rdbms\IDatabase\getType(), Wikimedia\Rdbms\IDatabase\query(), and Wikimedia\Rdbms\Platform\ISQLPlatform\tableName().

◆ decr()

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

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

Deprecated: Since 1.38

Reimplemented from BagOStuff.

Definition at line 293 of file SqlBagOStuff.php.

◆ deleteAll()

SqlBagOStuff::deleteAll ( )

Delete content of shard tables in every server.

Return true if the operation is successful, false otherwise.

Returns: bool

Definition at line 1542 of file SqlBagOStuff.php.

References Wikimedia\Rdbms\IDatabase\delete().

◆ deleteObjectsExpiringBefore()

SqlBagOStuff::deleteObjectsExpiringBefore	(		$timestamp,
		callable	$progress = null,
			$limit = INF,
		string	$tag = null )

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 \| float	$limit	Maximum number of keys to delete [default: INF]
string \| null	$tag	Tag to purge a single shard only. This is only supported when server tags are used in configuration.

Returns: bool Success; false if unimplemented

Reimplemented from MediumSpecificBagOStuff.

Definition at line 1391 of file SqlBagOStuff.php.

Referenced by expireAll().

◆ doAdd()

SqlBagOStuff::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 228 of file SqlBagOStuff.php.

◆ doCas()

SqlBagOStuff::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 243 of file SqlBagOStuff.php.

◆ doChangeTTL()

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

protected

Parameters

string	$key
int	$exptime
int	$flags

Returns: bool

Reimplemented from MediumSpecificBagOStuff.

Definition at line 258 of file SqlBagOStuff.php.

References BagOStuff\getCurrentTime().

◆ doChangeTTLMulti()

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

Parameters

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

Returns: bool Success

Reimplemented from MediumSpecificBagOStuff.

Definition at line 382 of file SqlBagOStuff.php.

References $keys, and BagOStuff\getCurrentTime().

◆ doDelete()

SqlBagOStuff::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 217 of file SqlBagOStuff.php.

References BagOStuff\getCurrentTime().

◆ doDeleteMulti()

SqlBagOStuff::doDeleteMulti	(	array	$keys,
			$flags = 0 )

protected

Parameters

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

Returns: bool Success

Reimplemented from MediumSpecificBagOStuff.

Definition at line 371 of file SqlBagOStuff.php.

References $keys, and BagOStuff\getCurrentTime().

◆ doGet()

SqlBagOStuff::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 185 of file SqlBagOStuff.php.

References unserialize(), and MediumSpecificBagOStuff\updateOpStats().

◆ doGetMulti()

SqlBagOStuff::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 330 of file SqlBagOStuff.php.

References $keys, unserialize(), and MediumSpecificBagOStuff\updateOpStats().

◆ doIncrWithInit()

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

protected

Parameters

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

Returns: int|bool New value or false on failure

Reimplemented from MediumSpecificBagOStuff.

Definition at line 269 of file SqlBagOStuff.php.

References BagOStuff\getCurrentTime().

◆ doLock()

SqlBagOStuff::doLock	(	$key,
		$timeout = 6,
		$exptime = 6 )

See also: MediumSpecificBagOStuff::lock()

Parameters

string	$key
int	$timeout	Lock wait timeout; 0 for non-blocking [optional]
int	$exptime	Lock time-to-live 1 day maximum [optional]

Returns: float|null UNIX timestamp of acquisition; null on failure

Reimplemented from MediumSpecificBagOStuff.

Definition at line 1560 of file SqlBagOStuff.php.

References Wikimedia\Rdbms\IDatabase\lock().

◆ doSet()

SqlBagOStuff::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 206 of file SqlBagOStuff.php.

References BagOStuff\getCurrentTime().

◆ doSetMulti()

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

protected

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

Returns: bool Success

Reimplemented from MediumSpecificBagOStuff.

Definition at line 355 of file SqlBagOStuff.php.

References BagOStuff\getCurrentTime().

◆ doUnlock()

SqlBagOStuff::doUnlock ( $key )

See also: MediumSpecificBagOStuff::unlock()

Parameters

string $key

Returns: bool Success

Reimplemented from MediumSpecificBagOStuff.

Definition at line 1581 of file SqlBagOStuff.php.

References Wikimedia\Rdbms\IDatabase\unlock().

◆ expireAll()

SqlBagOStuff::expireAll ( )

Definition at line 1387 of file SqlBagOStuff.php.

References deleteObjectsExpiringBefore(), and BagOStuff\getCurrentTime().

◆ incr()

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

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

Deprecated: Since 1.38

Reimplemented from BagOStuff.

Definition at line 289 of file SqlBagOStuff.php.

◆ makeKeyInternal()

SqlBagOStuff::makeKeyInternal	(		$keyspace,
			$components )

Make a cache key for the given keyspace and components.

Long components might be converted to respective hashes due to size constraints. In extreme cases, all of them might be combined into a single hash component.

Access: internal: This method should not be used outside of BagOStuff (since 1.36)

Parameters

string	$keyspace	Keyspace component
string[] \| int[]	$components	Key components (key collection name first)

Returns: string Keyspace-prepended list of encoded components as a colon-separated value

Since: 1.27

Reimplemented from BagOStuff.

Definition at line 1598 of file SqlBagOStuff.php.

References BagOStuff\$keyspace.

◆ serialize()

SqlBagOStuff::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 1624 of file SqlBagOStuff.php.

References serialize().

◆ unserialize()

SqlBagOStuff::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 1638 of file SqlBagOStuff.php.

References MediumSpecificBagOStuff\isInteger(), and unserialize().

Member Data Documentation

◆ $connFailureErrors

Exception [] SqlBagOStuff::$connFailureErrors = []

protected

Map of (shard index => Exception)

Definition at line 86 of file SqlBagOStuff.php.

◆ $connFailureTimes

float [] SqlBagOStuff::$connFailureTimes = []

protected

Map of (shard index => UNIX timestamps)

Definition at line 84 of file SqlBagOStuff.php.

◆ $conns

IMaintainableDatabase [] SqlBagOStuff::$conns

protected

Map of (shard index => DB handle)

Definition at line 82 of file SqlBagOStuff.php.

◆ $dbDomain

string false null SqlBagOStuff::$dbDomain

protected

DB name used for keys using the LoadBalancer.

Definition at line 56 of file SqlBagOStuff.php.

◆ $lastGarbageCollect

float SqlBagOStuff::$lastGarbageCollect = 0

protected

UNIX timestamp.

Definition at line 65 of file SqlBagOStuff.php.

◆ $loadBalancer

ILoadBalancer null SqlBagOStuff::$loadBalancer

protected

Definition at line 54 of file SqlBagOStuff.php.

◆ $loadBalancerCallback

callable null SqlBagOStuff::$loadBalancerCallback

protected

Injected function which returns a LoadBalancer.

Definition at line 52 of file SqlBagOStuff.php.

◆ $multiPrimaryMode

bool SqlBagOStuff::$multiPrimaryMode

protected

Whether multi-primary mode is enabled.

Definition at line 79 of file SqlBagOStuff.php.

◆ $numTableShards

int SqlBagOStuff::$numTableShards = 1

protected

Number of table shards to use on each server.

Definition at line 71 of file SqlBagOStuff.php.

◆ $purgeLimit

int SqlBagOStuff::$purgeLimit = 100

protected

Max expired rows to purge during randomized garbage collection.

Definition at line 69 of file SqlBagOStuff.php.

◆ $purgePeriod

int SqlBagOStuff::$purgePeriod = 10

protected

Average number of writes required to trigger garbage collection.

Definition at line 67 of file SqlBagOStuff.php.

◆ $replicaOnly

bool SqlBagOStuff::$replicaOnly

protected

Whether to use replicas instead of primaries (if using LoadBalancer)

Definition at line 77 of file SqlBagOStuff.php.

◆ $serverInfos

array [] SqlBagOStuff::$serverInfos = []

protected

(server index => server config)

Definition at line 61 of file SqlBagOStuff.php.

◆ $serverTags

string [] SqlBagOStuff::$serverTags = []

protected

(server index => tag/host name)

Definition at line 63 of file SqlBagOStuff.php.

◆ $tableName

string SqlBagOStuff::$tableName = 'objectcache'

protected

Definition at line 75 of file SqlBagOStuff.php.

◆ $useLB

bool SqlBagOStuff::$useLB = false

protected

Whether to use the LoadBalancer.

Definition at line 58 of file SqlBagOStuff.php.

◆ $writeBatchSize

int SqlBagOStuff::$writeBatchSize = 100

protected

Definition at line 73 of file SqlBagOStuff.php.

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

includes/objectcache/SqlBagOStuff.php

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ createTables()

◆ decr()

◆ deleteAll()

◆ deleteObjectsExpiringBefore()

◆ doAdd()

◆ doCas()

◆ doChangeTTL()

◆ doChangeTTLMulti()

◆ doDelete()

◆ doDeleteMulti()

◆ doGet()

◆ doGetMulti()

◆ doIncrWithInit()

◆ doLock()

◆ doSet()

◆ doSetMulti()

◆ doUnlock()

◆ expireAll()

◆ incr()

◆ makeKeyInternal()

◆ serialize()

◆ unserialize()

Member Data Documentation

◆ $connFailureErrors

◆ $connFailureTimes

◆ $conns

◆ $dbDomain

◆ $lastGarbageCollect

◆ $loadBalancer

◆ $loadBalancerCallback

◆ $multiPrimaryMode

◆ $numTableShards

◆ $purgeLimit

◆ $purgePeriod

◆ $replicaOnly

◆ $serverInfos

◆ $serverTags

◆ $tableName

◆ $useLB

◆ $writeBatchSize