class QueueDatabaseFactory

class QueueDatabaseFactory {
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $connection;
    
    /**
     * Constructs this factory object.
     *
     * @param \Drupal\Core\Database\Connection $connection
     *   The Connection object containing the key-value tables.
     */
    public function __construct(Connection $connection) {
        $this->connection = $connection;
    }
    
    /**
     * Constructs a new queue object for a given name.
     *
     * @param string $name
     *   The name of the collection holding key and value pairs.
     *
     * @return \Drupal\Core\Queue\DatabaseQueue
     *   A key/value store implementation for the given $collection.
     */
    public function get($name) {
        return new DatabaseQueue($name, $this->connection);
    }

}