Manage locks using memcached servers. More...

Inheritance diagram for MemcLockManager:

Collaboration diagram for MemcLockManager:

Public Member Functions
	__construct (array $config)
	Construct a new instance from configuration.
	__destruct ()
	Make sure remaining locks get cleared for sanity.
Protected Member Functions
	acquireMutexes (MemcachedBagOStuff $memc, array $keys)
	doFreeLocksOnServer ($lockSrv, array $paths, $type)
	doGetLocksOnServer ($lockSrv, array $paths, $type)
	freeLocksOnServer ($lockSrv, array $pathsByType)
	Get a connection to a lock server and release locks on $paths.
	getCache ($lockSrv)
	Get the MemcachedBagOStuff object for a $lockSrv.
	getLocksOnServer ($lockSrv, array $pathsByType)
	Get a connection to a lock server and acquire locks.
	isServerUp ($lockSrv)
	recordKeyForPath ($path)
	releaseAllLocks ()
	releaseMutexes (MemcachedBagOStuff $memc, array $keys)
Static Protected Member Functions
static	newLockArray ()
static	sanitizeLockArray ($a)
Protected Attributes
array	$bagOStuffs = array()
	Map server names to MemcachedBagOStuff objects *.
array	$lockTypeMap
	Mapping of lock types to the type actually used *.
array	$serversUp = array()
	(server name => bool) *
string	$session = ''
	Random UUID *.

Detailed Description

Manage locks using memcached servers.

Version of LockManager based on using memcached servers. This is meant for multi-wiki systems that may share files. All locks are non-blocking, which avoids deadlocks.

All lock requests for a resource, identified by a hash string, will map to one bucket. Each bucket maps to one or several peer servers, each running memcached. A majority of peers must agree for a lock to be acquired.

Since:: 1.20

Definition at line 38 of file MemcLockManager.php.

Constructor & Destructor Documentation

MemcLockManager::__construct ( array $ config )

Construct a new instance from configuration.

Parameters:

array

$config

Paramaters include:

lockServers : Associative array of server names to "<IP>:<port>" strings.
srvsByBucket : Array of 1-16 consecutive integer keys, starting from 0, each having an odd-numbered list of server names (peers) as values.
memcConfig : Configuration array for ObjectCache::newFromParams. [optional] If set, this must use one of the memcached classes.

Exceptions:

MWException

Reimplemented from LockManager.

Definition at line 62 of file MemcLockManager.php.

MemcLockManager::__destruct ( )

Make sure remaining locks get cleared for sanity.

Definition at line 372 of file MemcLockManager.php.

References array(), as, and QuorumLockManager\doUnlock().

Member Function Documentation

MemcLockManager::acquireMutexes	(	MemcachedBagOStuff $	memc,
		array $	keys
	)		`[protected]`

Parameters:

MemcachedBagOStuff	$memc
array	$keys	List of keys to acquire

Returns:: bool

Definition at line 326 of file MemcLockManager.php.

MemcLockManager::doFreeLocksOnServer	(	$	lockSrv,
		array $	paths,
		$	type
	)		`[protected]`

See also:: QuorumLockManager::freeLocksOnServer()

Parameters:

string	$lockSrv
array	$paths
string	$type

Returns:: Status

Definition at line 203 of file MemcLockManager.php.

MemcLockManager::doGetLocksOnServer	(	$	lockSrv,
		array $	paths,
		$	type
	)		`[protected]`

See also:: QuorumLockManager::getLocksOnServer()

Parameters:

string	$lockSrv
array	$paths
string	$type

Returns:: Status

Definition at line 127 of file MemcLockManager.php.

MemcLockManager::freeLocksOnServer	(	$	lockSrv,
		array $	pathsByType
	)		`[protected]`

Get a connection to a lock server and release locks on $paths.

Subclasses must effectively implement this or releaseAllLocks().

Parameters:

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

Returns:: Status

Reimplemented from QuorumLockManager.

Definition at line 110 of file MemcLockManager.php.

MemcLockManager::getCache ( $ lockSrv ) [protected]

Get the MemcachedBagOStuff object for a $lockSrv.

Parameters:

string $lockSrv Server name

Returns:: MemcachedBagOStuff|null

Definition at line 274 of file MemcLockManager.php.

MemcLockManager::getLocksOnServer	(	$	lockSrv,
		array $	pathsByType
	)		`[protected]`

Get a connection to a lock server and acquire locks.

Parameters:

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

Returns:: Status

Reimplemented from QuorumLockManager.

Definition at line 88 of file MemcLockManager.php.

MemcLockManager::isServerUp ( $ lockSrv ) [protected]

See also:: QuorumLockManager::isServerUp()

Parameters:

string $lockSrv

Returns:: bool

Reimplemented from QuorumLockManager.

Definition at line 264 of file MemcLockManager.php.

static MemcLockManager::newLockArray ( ) [static, protected]

Returns:: array An empty lock structure for a key

Definition at line 303 of file MemcLockManager.php.

References array().

MemcLockManager::recordKeyForPath ( $ path ) [protected]

Parameters:

string $path

Returns:: string

Definition at line 296 of file MemcLockManager.php.

MemcLockManager::releaseAllLocks ( ) [protected]

See also:: QuorumLockManager::releaseAllLocks()

Returns:: Status

Reimplemented from QuorumLockManager.

Definition at line 255 of file MemcLockManager.php.

MemcLockManager::releaseMutexes	(	MemcachedBagOStuff $	memc,
		array $	keys
	)		`[protected]`

Parameters:

MemcachedBagOStuff	$memc
array	$keys	List of acquired keys

Definition at line 363 of file MemcLockManager.php.

static MemcLockManager::sanitizeLockArray ( $ a ) [static, protected]

Parameters:

array $a

Returns:: array An empty lock structure for a key

Definition at line 311 of file MemcLockManager.php.

Member Data Documentation

array MemcLockManager::$bagOStuffs = array() [protected]

Map server names to MemcachedBagOStuff objects *.

Definition at line 45 of file MemcLockManager.php.

array MemcLockManager::$lockTypeMap [protected]

Initial value:

 array(
        self::LOCK_SH => self::LOCK_SH,
        self::LOCK_UW => self::LOCK_SH,
        self::LOCK_EX => self::LOCK_EX
    )

Mapping of lock types to the type actually used *.

Reimplemented from LockManager.

Definition at line 39 of file MemcLockManager.php.

array MemcLockManager::$serversUp = array() [protected]

(server name => bool) *

Definition at line 47 of file MemcLockManager.php.

string MemcLockManager::$session = '' [protected]

Random UUID *.

Definition at line 49 of file MemcLockManager.php.

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

includes/filebackend/lockmanager/MemcLockManager.php

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation