Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Lock;
Chris@0: 
Chris@0: use Drupal\Core\Database\Connection;
Chris@0: 
Chris@0: /**
Chris@0:  * Defines the persistent database lock backend. This backend is global for this
Chris@0:  * Drupal installation.
Chris@0:  *
Chris@0:  * @ingroup lock
Chris@0:  */
Chris@0: class PersistentDatabaseLockBackend extends DatabaseLockBackend {
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new PersistentDatabaseLockBackend.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Database\Connection $database
Chris@0:    *   The database connection.
Chris@0:    */
Chris@0:   public function __construct(Connection $database) {
Chris@0:     // Do not call the parent constructor to avoid registering a shutdown
Chris@0:     // function that releases all the locks at the end of a request.
Chris@0:     $this->database = $database;
Chris@0:     // Set the lockId to a fixed string to make the lock ID the same across
Chris@0:     // multiple requests. The lock ID is used as a page token to relate all the
Chris@0:     // locks set during a request to each other.
Chris@0:     // @see \Drupal\Core\Lock\LockBackendInterface::getLockId()
Chris@0:     $this->lockId = 'persistent';
Chris@0:   }
Chris@0: 
Chris@0: }