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<?php
namespace Drupal\Core\Lock;
use Drupal\Core\Database\Connection;
/**
* Defines the persistent database lock backend.
*
* This backend is global for this Drupal installation.
*
* @ingroup 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';
}
}
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