Class for handling resource locking. More...

Inheritance diagram for LockManager:

Collaboration diagram for LockManager:

Public Member Functions
	__construct (array $config)
	Construct a new instance from configuration.
	lock (array $paths, $type=self::LOCK_EX)
	Lock the resources at the given abstract paths.
	unlock (array $paths, $type=self::LOCK_EX)
	Unlock the resources at the given abstract paths.
Public Attributes
const	LOCK_EX = 3
const	LOCK_SH = 1
const	LOCK_UW = 2
Protected Member Functions
	doLock (array $paths, $type)
	Lock resources with the given keys and lock type.
	doUnlock (array $paths, $type)
	Unlock resources with the given keys and lock type.
	sha1Base16Absolute ($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 = array()
	Map of (resource path => lock type => count) *.
	$lockTTL
Array	$lockTypeMap
	Mapping of lock types to the type actually used *.

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 proccess 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.

Since:: 1.19

Definition at line 45 of file LockManager.php.

Constructor & Destructor Documentation

LockManager::__construct ( array $ config )

Construct a new instance from configuration.

$config paramaters 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.

Parameters:

$config Array

Reimplemented in DBLockManager, LSLockManager, MemcLockManager, and FSLockManager.

Definition at line 72 of file LockManager.php.

Member Function Documentation

LockManager::doLock	(	array $	paths,
		$	type
	)		`[abstract, protected]`

Lock resources with the given keys and lock type.

Parameters:

array	$paths	List of storage paths
	$type	integer LockManager::LOCK_* constant

Returns:: string

Reimplemented in NullLockManager, FSLockManager, and QuorumLockManager.

LockManager::doUnlock	(	array $	paths,
		$	type
	)		`[abstract, protected]`

Unlock resources with the given keys and lock type.

Parameters:

array	$paths	List of storage paths
	$type	integer LockManager::LOCK_* constant

Returns:: string

Reimplemented in NullLockManager, FSLockManager, and QuorumLockManager.

LockManager::lock	(	array $	paths,
		$	type = `self::LOCK_EX`
	)		`[final]`

Lock the resources at the given abstract paths.

Parameters:

array	$paths	List of resource names
	$type	integer LockManager::LOCK_* constant

Returns:: Status

Definition at line 91 of file LockManager.php.

LockManager::sha1Base16Absolute ( $ path ) [final, protected]

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 interally for lock key or file names.

Parameters:

$path string

Returns:: string

Definition at line 132 of file LockManager.php.

LockManager::sha1Base36Absolute ( $ path ) [final, protected]

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 interally for lock key or file names.

Parameters:

$path string

Returns:: string

Definition at line 120 of file LockManager.php.

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

Unlock the resources at the given abstract paths.

Parameters:

array	$paths	List of storage paths
	$type	integer LockManager::LOCK_* constant

Returns:: Status

Definition at line 105 of file LockManager.php.

Member Data Documentation

LockManager::$domain [protected]

Definition at line 54 of file LockManager.php.

Array LockManager::$locksHeld = array() [protected]

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

Definition at line 52 of file LockManager.php.

LockManager::$lockTTL [protected]

Definition at line 55 of file LockManager.php.

Array LockManager::$lockTypeMap [protected]

Initial value:

 array(
                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 *.

Reimplemented in PostgreSqlLockManager, MySqlLockManager, LSLockManager, MemcLockManager, and FSLockManager.

Definition at line 46 of file LockManager.php.

const LockManager::LOCK_EX = 3

Definition at line 60 of file LockManager.php.

Referenced by FileBackendTest\doTestLockCalls(), and SyncFileBackend\syncFileBatch().

const LockManager::LOCK_SH = 1

Definition at line 58 of file LockManager.php.

Referenced by FileBackendTest\doTestLockCalls().

const LockManager::LOCK_UW = 2

Definition at line 59 of file LockManager.php.

Referenced by SyncFileBackend\syncFileBatch().