class PersistentDatabaseLockBackend in Service Container 7.2

Defines the persistent database lock backend. This backend is global for this Drupal installation.

Hierarchy

• class \Drupal\Core\Lock\LockBackendAbstract implements LockBackendInterface
  • class \Drupal\Core\Lock\DatabaseLockBackend
    • class \Drupal\Core\Lock\PersistentDatabaseLockBackend

Related topics

Locking mechanisms

Functions to coordinate long-running operations across requests.

File

lib/Drupal/Core/Lock/PersistentDatabaseLockBackend.php, line 18

Contains \Drupal\Core\Lock\PersistentDatabaseLockBackend.

Namespace

Drupal\Core\Lock

class PersistentDatabaseLockBackend extends DatabaseLockBackend {

  /**
   * Constructs a new PersistentDatabaseLockBackend.
   *
   * @param \Drupal\Core\Database\Connection $database
   *   The database connection.
   */
  public function __construct(Connection $database) {

    // Do not call the parent constructor to avoid registering a shutdown
    // function that releases all the locks at the end of a request.
    $this->database = $database;

    // Set the lockId to a fixed string to make the lock ID the same across
    // multiple requests. The lock ID is used as a page token to relate all the
    // locks set during a request to each other.
    // @see \Drupal\Core\Lock\LockBackendInterface::getLockId()
    $this->lockId = 'persistent';
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DatabaseLockBackend::$database	protected	property	The database connection.
DatabaseLockBackend::acquire	public	function	Implements Drupal\Core\Lock\LockBackedInterface::acquire(). Overrides LockBackendInterface::acquire
DatabaseLockBackend::lockMayBeAvailable	public	function	Implements Drupal\Core\Lock\LockBackedInterface::lockMayBeAvailable(). Overrides LockBackendInterface::lockMayBeAvailable
DatabaseLockBackend::release	public	function	Implements Drupal\Core\Lock\LockBackedInterface::release(). Overrides LockBackendInterface::release
DatabaseLockBackend::releaseAll	public	function	Implements Drupal\Core\Lock\LockBackedInterface::releaseAll(). Overrides LockBackendInterface::releaseAll
LockBackendAbstract::$lockId	protected	property	Current page lock token identifier.
LockBackendAbstract::$locks	protected	property	Existing locks for this page.
LockBackendAbstract::getLockId	public	function	Implements Drupal\Core\Lock\LockBackedInterface::getLockId(). Overrides LockBackendInterface::getLockId
LockBackendAbstract::wait	public	function	Implements Drupal\Core\Lock\LockBackedInterface::wait(). Overrides LockBackendInterface::wait
PersistentDatabaseLockBackend::__construct	public	function	Constructs a new PersistentDatabaseLockBackend. Overrides DatabaseLockBackend::__construct