/**
* Constructor
*
* @param ConfigInterface $config
* @param RequestInterface $request
*/
public function __construct(ConfigInterface $config, RequestInterface $request = null)
{
$this->config = $config;
if ($request === null) {
$request = new Request();
}
$this->request = $request;
$this->identifier = call_user_func($this->config->getHashNameCallback(), $request);
}
