public function store($id, $data = array())
    {
        try {

            if (empty($id)) {
                throw new StorageException('Invalid id parameter.');
            }
            $this->persistence = $this->getPersistence();

            $data = $this->cleanInputData($data);
            if (!$this->exists($id)) {
                $this->insert($id, $data);
            } else {
                $this->update($id, $data);
            }
            return true;

        } catch (\PDOException $e) {
            throw new StorageException($e->getMessage());
        }
    }