public function fetchUnique()
    {
        $filePath = $this->filePath;
        eZDebugSetting::writeDebug( 'kernel-clustering', "dfs::fetchUnique( '$filePath' )" );

        $fetchedFilePath = self::$dbbackend->_fetch( $filePath, true );
        $this->uniqueName = $fetchedFilePath;
        return $fetchedFilePath;
    }