protected function putData(array $newData)
    {
        // opening up the file, and creating an exclusive lock
        $handle = fopen($this->locksFile, 'a+');
        flock($handle, LOCK_EX);

        // We can only truncate and rewind once the lock is acquired.
        ftruncate($handle, 0);
        rewind($handle);

        fwrite($handle, serialize($newData));
        flock($handle, LOCK_UN);
        fclose($handle);
    }