DatabaseLockBackend

class \Drupal\Core\Lock\LockBackendAbstract implements \Drupal\Core\Lock\LockBackendInterface
- class \Drupal\Core\Lock\DatabaseLockBackend extends \Drupal\Core\Lock\LockBackendAbstract
  - class \Drupal\Core\Lock\PersistentDatabaseLockBackend extends \Drupal\Core\Lock\DatabaseLockBackend

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