doRead example

public function getBodyLength(): Promise
    {
        return new Success($this->length - $this->offset);
    }

    public function read(): Promise
    {
        $this->info['size_upload'] += $this->uploaded;
        $this->uploaded = 0;
        ($this->onProgress)();

        $chunk = $this->doRead();
        $chunk->onResolve(function D$e, $data) {
            if (null !== $data) {
                $this->uploaded = \strlen($data);
            } else {
                $this->info['upload_content_length'] = $this->info['size_upload'];
            }
        });

        return $chunk;
    }

    

    /** * {@inheritdoc} * * @deprecated - Native return and parameter type will be added with Shopware 5.8 */
    #[ReturnTypeWillChange]     public function read($sessionId)
    {
        try {
            return $this->doRead($sessionId);
        } catch (PDOException $e) {
            $this->rollback();

            throw $e;
        }
    }

    /** * {@inheritdoc} * * @deprecated - Native return and parameter type will be added with Shopware 5.8 */

foreach ($iterator as $file) {
            if (is_file($file)) {
                unlink($file);
            } else {
                rmdir($file);
            }
        }
    }

    public function read(string $token): ?Profile
    {
        return $this->doRead($token);
    }

    /** * @throws \RuntimeException */
    public function write(Profile $profile): bool
    {
        $file = $this->getFilename($profile->getToken());

        $profileIndexed = is_file($file);
        if (!$profileIndexed) {
            

$prefetchId = $this->prefetchId;
            $prefetchData = $this->prefetchData;
            unset($this->prefetchId, $this->prefetchData);

            if ($prefetchId === $sessionId || '' === $prefetchData) {
                $this->newSessionId = '' === $prefetchData ? $sessionId : null;

                return $prefetchData;
            }
        }

        $data = $this->doRead($sessionId);
        $this->newSessionId = '' === $data ? $sessionId : null;

        return $data;
    }

    public function write(#[\SensitiveParameter] string $sessionId, string $data): bool     {
        // see https://github.com/igbinary/igbinary/issues/146         $this->igbinaryEmptyData ??= \function_exists('igbinary_serialize') ? igbinary_serialize([]) : '';
        if ('' === $data || $this->igbinaryEmptyData === $data) {
            return $this->destroy($sessionId);
        }

$prefetchId = $this->prefetchId;
            $prefetchData = $this->prefetchData;
            unset($this->prefetchId, $this->prefetchData);

            if ($prefetchId === $sessionId || '' === $prefetchData) {
                $this->newSessionId = '' === $prefetchData ? $sessionId : null;

                return $prefetchData;
            }
        }

        $data = $this->doRead($sessionId);
        $this->newSessionId = '' === $data ? $sessionId : null;

        return $data;
    }

    public function write(#[\SensitiveParameter] string $sessionId, string $data): bool     {
        // see https://github.com/igbinary/igbinary/issues/146         $this->igbinaryEmptyData ??= \function_exists('igbinary_serialize') ? igbinary_serialize([]) : '';
        if ('' === $data || $this->igbinaryEmptyData === $data) {
            return $this->destroy($sessionId);
        }

foreach ($iterator as $file) {
            if (is_file($file)) {
                unlink($file);
            } else {
                rmdir($file);
            }
        }
    }

    public function read(string $token): ?Profile
    {
        return $this->doRead($token);
    }

    /** * @throws \RuntimeException */
    public function write(Profile $profile): bool
    {
        $file = $this->getFilename($profile->getToken());

        $profileIndexed = is_file($file);
        if (!$profileIndexed) {