Class for handling resource locking. More...

Inheritance diagram for LockManager:

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Collaboration diagram for LockManager:

Public Member Functions
	__construct (array $config)
	Construct a new instance from configuration Stable to call.

	lock (array $paths, $type=self::LOCK_EX, $timeout=0)
	Lock the resources at the given abstract paths.

	lockByType (array $pathsByType, $timeout=0)
	Lock the resources at the given abstract paths.

	unlock (array $paths, $type=self::LOCK_EX)
	Unlock the resources at the given abstract paths.

	unlockByType (array $pathsByType)
	Unlock the resources at the given abstract paths.

Public Attributes
const	LOCK_EX = 3

const	LOCK_SH = 1
	Lock types; stronger locks have higher values.

const	LOCK_UW = 2

Protected Member Functions
	doLock (array $paths, $type)
	Lock resources with the given keys and lock type.

	doLockByType (array $pathsByType)

	doUnlock (array $paths, $type)
	Unlock resources with the given keys and lock type.

	doUnlockByType (array $pathsByType)

	normalizePathsByType (array $pathsByType)
	Normalize the $paths array by converting LOCK_UW locks into the appropriate type and removing any duplicated paths for each lock type.

	sha1Base16Absolute ( $path)
	Get the base 16 SHA-1 of a string, padded to 31 digits.

	sha1Base36Absolute ( $path)
	Get the base 36 SHA-1 of a string, padded to 31 digits.

Protected Attributes
	$domain

array	$locksHeld = []
	Map of (resource path => lock type => count)

	$lockTTL

array	$lockTypeMap
	Mapping of lock types to the type actually used.

LoggerInterface	$logger

string	$session
	Random 32-char hex number.

Detailed Description

Class for handling resource locking.

Locks on resource keys can either be shared or exclusive.

Implementations must keep track of what is locked by this process in-memory and support nested locking calls (using reference counting). At least LOCK_UW and LOCK_EX must be implemented. LOCK_SH can be a no-op. Locks should either be non-blocking or have low wait timeouts.

Subclasses should avoid throwing exceptions at all costs.

Stable to extend

Since: 1.19

Definition at line 48 of file LockManager.php.

Constructor & Destructor Documentation

◆ __construct()

LockManager::__construct ( array $config )

Construct a new instance from configuration Stable to call.

Parameters

array

$config

Parameters include:

domain : Domain (usually wiki ID) that all resources are relative to [optional]
lockTTL : Age (in seconds) at which resource locks should expire. This only applies if locks are not tied to a connection/process.

Reimplemented in MySqlLockManager, DBLockManager, FSLockManager, MemcLockManager, and RedisLockManager.

Definition at line 85 of file LockManager.php.

Member Function Documentation

◆ doLock()

LockManager::doLock	(	array	$paths,
			$type
	)

abstractprotected

Lock resources with the given keys and lock type.

Parameters

array	$paths	List of paths
int	$type	LockManager::LOCK_* constant

Returns: StatusValue

Reimplemented in FSLockManager, NullLockManager, and QuorumLockManager.

Referenced by doLockByType().

◆ doLockByType()

LockManager::doLockByType ( array $pathsByType )

protected

See also: LockManager::lockByType() Stable to override

Parameters

array $pathsByType Map of LockManager::LOCK_* constants to lists of paths

Returns: StatusValue

Since: 1.22

Reimplemented in QuorumLockManager.

Definition at line 225 of file LockManager.php.

References $type, doLock(), and doUnlock().

Referenced by lockByType().

◆ doUnlock()

LockManager::doUnlock	(	array	$paths,
			$type
	)

abstractprotected

Unlock resources with the given keys and lock type.

Parameters

array	$paths	List of paths
int	$type	LockManager::LOCK_* constant

Returns: StatusValue

Reimplemented in FSLockManager, NullLockManager, and QuorumLockManager.

Referenced by doLockByType(), and doUnlockByType().

◆ doUnlockByType()

LockManager::doUnlockByType ( array $pathsByType )

protected

See also: LockManager::unlockByType() Stable to override

Parameters

array $pathsByType Map of LockManager::LOCK_* constants to lists of paths

Returns: StatusValue

Since: 1.22

Reimplemented in QuorumLockManager.

Definition at line 260 of file LockManager.php.

References $type, and doUnlock().

Referenced by unlockByType().

◆ lock()

LockManager::lock	(	array	$paths,
			$type = `self::LOCK_EX`,
			$timeout = `0`
	)

final

Lock the resources at the given abstract paths.

Parameters

array	$paths	List of resource names
int	$type	LockManager::LOCK_* constant
int	$timeout	Timeout in seconds (0 means non-blocking) (since 1.21)

Returns: StatusValue

Definition at line 118 of file LockManager.php.

References $type, and lockByType().

Referenced by RedisLockManager\getLocksOnServer().

◆ lockByType()

LockManager::lockByType	(	array	$pathsByType,
			$timeout = `0`
	)

final

Lock the resources at the given abstract paths.

Parameters

array	$pathsByType	Map of LockManager::LOCK_* constants to lists of paths
int	$timeout	Timeout in seconds (0 means non-blocking) (since 1.21)

Returns: StatusValue

Since: 1.22

Definition at line 130 of file LockManager.php.

References doLockByType(), and normalizePathsByType().

Referenced by ScopedLock\factory(), and lock().

◆ normalizePathsByType()

LockManager::normalizePathsByType ( array $pathsByType )

finalprotected

Normalize the $paths array by converting LOCK_UW locks into the appropriate type and removing any duplicated paths for each lock type.

Parameters

array $pathsByType Map of LockManager::LOCK_* constants to lists of paths

Returns: array

Since: 1.22

Definition at line 204 of file LockManager.php.

References $path, $res, and $type.

Referenced by lockByType(), and unlockByType().

◆ sha1Base16Absolute()

LockManager::sha1Base16Absolute ( $path )

finalprotected

Get the base 16 SHA-1 of a string, padded to 31 digits.

Before hashing, the path will be prefixed with the domain ID. This should be used internally for lock key or file names.

Parameters

string $path

Returns: string

Definition at line 192 of file LockManager.php.

◆ sha1Base36Absolute()

LockManager::sha1Base36Absolute ( $path )

finalprotected

Get the base 36 SHA-1 of a string, padded to 31 digits.

Before hashing, the path will be prefixed with the domain ID. This should be used internally for lock key or file names.

Parameters

string $path

Returns: string

Definition at line 180 of file LockManager.php.

Referenced by MySqlLockManager\doGetLocksOnServer(), MemcLockManager\recordKeyForPath(), and RedisLockManager\recordKeyForPath().

◆ unlock()

LockManager::unlock	(	array	$paths,
			$type = `self::LOCK_EX`
	)

final

Unlock the resources at the given abstract paths.

Parameters

array	$paths	List of paths
int	$type	LockManager::LOCK_* constant

Returns: StatusValue

Definition at line 154 of file LockManager.php.

References $type, and unlockByType().

◆ unlockByType()

LockManager::unlockByType ( array $pathsByType )

final

Unlock the resources at the given abstract paths.

Parameters

array $pathsByType Map of LockManager::LOCK_* constants to lists of paths

Returns: StatusValue

Since: 1.22

Definition at line 165 of file LockManager.php.

References doUnlockByType(), and normalizePathsByType().

Referenced by RedisLockManager\__destruct(), and unlock().

Member Data Documentation

◆ $domain

LockManager::$domain

protected

Definition at line 62 of file LockManager.php.

◆ $locksHeld

array LockManager::$locksHeld = []

protected

Map of (resource path => lock type => count)

Definition at line 60 of file LockManager.php.

Referenced by MemcLockManager\freeLocksOnServer(), and MemcLockManager\getLocksOnServer().

◆ $lockTTL

LockManager::$lockTTL

protected

Definition at line 63 of file LockManager.php.

Referenced by MemcLockManager\getLocksOnServer().

◆ $lockTypeMap

array LockManager::$lockTypeMap

protected

Initial value:

= [
        self::LOCK_SH => self::LOCK_SH,
        self::LOCK_UW => self::LOCK_EX, 
        self::LOCK_EX => self::LOCK_EX
    ]

Mapping of lock types to the type actually used.

Definition at line 53 of file LockManager.php.

◆ $logger

LoggerInterface LockManager::$logger

protected

Definition at line 50 of file LockManager.php.

◆ $session

string LockManager::$session

protected

Random 32-char hex number.

Definition at line 66 of file LockManager.php.

Referenced by MySqlLockManager\doGetLocksOnServer(), and MemcLockManager\getLocksOnServer().

◆ LOCK_EX

const LockManager::LOCK_EX = 3

Definition at line 71 of file LockManager.php.

Referenced by FSLockManager\doSingleLock(), Wikimedia\Rdbms\DatabaseSqlite\lock(), and Wikimedia\Rdbms\DatabaseSqlite\unlock().

◆ LOCK_SH

const LockManager::LOCK_SH = 1

Lock types; stronger locks have higher values.

Definition at line 69 of file LockManager.php.

Referenced by PostgreSqlLockManager\doGetLocksOnServer(), FSLockManager\doSingleLock(), RedisLockManager\freeLocksOnServer(), and RedisLockManager\getLocksOnServer().

◆ LOCK_UW

const LockManager::LOCK_UW = 2

Definition at line 70 of file LockManager.php.

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

includes/libs/lockmanager/LockManager.php

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ doLock()

◆ doLockByType()

◆ doUnlock()

◆ doUnlockByType()

◆ lock()

◆ lockByType()

◆ normalizePathsByType()

◆ sha1Base16Absolute()

◆ sha1Base36Absolute()

◆ unlock()

◆ unlockByType()

Member Data Documentation

◆ $domain

◆ $locksHeld

◆ $lockTTL

◆ $lockTypeMap

◆ $logger

◆ $session

◆ LOCK_EX

◆ LOCK_SH

◆ LOCK_UW