core\lock\lock_factory Interface Reference

Inheritance diagram for core\lock\lock_factory:

Public Member Functions
	__construct ($type)
	Define the constructor signature required by the lock_config class. More...
	extend_lock (lock $lock, $maxlifetime=86400)
	Extend the timeout on a held lock. More...
	get_lock ($resource, $timeout, $maxlifetime=86400)
	Get a lock within the specified timeout or return false. More...
	is_available ()
	Is available. More...
	release_lock (lock $lock)
	Release a lock that was previously obtained with @lock. More...
	supports_auto_release ()
	Will this lock be automatically released when the process ends. More...
	supports_recursion ()
	Supports recursion. More...
	supports_timeout ()
	Return information about the blocking behaviour of the locks on this platform. More...

Constructor & Destructor Documentation

__construct()

core\lock\lock_factory::__construct

(

$type

)

Define the constructor signature required by the lock_config class.

Parameters

string

$type

- The type this lock is used for (e.g. cron, cache)

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

Member Function Documentation

extend_lock()

core\lock\lock_factory::extend_lock	(	lock	$lock,
			$maxlifetime = 86400
	)

Extend the timeout on a held lock.

Parameters

lock	$lock	- lock obtained from this factory
int	$maxlifetime	- new max time to hold the lock

Return values

boolean

- True if the lock was extended.

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

get_lock()

core\lock\lock_factory::get_lock	(		$resource,
			$timeout,
			$maxlifetime = 86400
	)

Get a lock within the specified timeout or return false.

Parameters

string	$resource	- The identifier for the lock. Should use frankenstyle prefix.
int	$timeout	- The number of seconds to wait for a lock before giving up. Not all lock types will support this.
int	$maxlifetime	- The number of seconds to wait before reclaiming a stale lock. Not all lock types will use this - e.g. if they support auto releasing a lock when a process ends.

Return values

core

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

is_available()

core\lock\lock_factory::is_available

(

)

Is available.

Return values

boolean

- True if this lock type is available in this environment.

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

release_lock()

core\lock\lock_factory::release_lock

(

lock

$lock

)

Release a lock that was previously obtained with @lock.

Parameters

lock

$lock

- The lock to release.

Return values

boolean

- True if the lock is no longer held (including if it was never held).

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

supports_auto_release()

core\lock\lock_factory::supports_auto_release

(

)

Will this lock be automatically released when the process ends.

This should never be relied upon in code - but is useful in the case of fatal errors. If a lock type does not support this auto release, the max lock time parameter must be obeyed to eventually clean up a lock.

Return values

boolean

- True if this lock type will be automatically released when the current process ends.

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

supports_recursion()

core\lock\lock_factory::supports_recursion

(

)

Supports recursion.

Return values

boolean

- True if attempting to get 2 locks on the same resource will "stack"

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

supports_timeout()

core\lock\lock_factory::supports_timeout

(

)

Return information about the blocking behaviour of the locks on this platform.

Return values

boolean

- False if attempting to get a lock will block indefinitely.

Implemented in core\lock\postgres_lock_factory, core\lock\installation_lock_factory, core\lock\file_lock_factory, and core\lock\db_record_lock_factory.

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

• lib/classes/lock/lock_factory.php