/**
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\Response
     * @Route("/checkNotyfication",name="lastNotification")
     */
    public function getLastNotyficationMessageAction(Request $request)
    {
        if ($request->isXmlHttpRequest()) {

            $file = $this->get('kernel')->getRootDir() . '/../web/dane.txt';
//

            // main loop
            while (true) {
                // if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
                $last_ajax_call = isset($_GET['timestamp']) ? (int)$_GET['timestamp'] : null;
                // PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
                clearstatcache();
                // get timestamp of when file has been changed the last time
                $last_change_in_data_file = filemtime($file);
                // if no timestamp delivered via ajax or data.txt has been changed SINCE last ajax timestamp
                if ($last_ajax_call == null || $last_change_in_data_file > $last_ajax_call) {
                    // get content of data.txt
                    $data = file_get_contents($file);
                    // put data.txt's content and timestamp of last data.txt change into array
                    $result = array(
                        'data_from_file' => $data,
                        'timestamp' => $last_change_in_data_file
                    );
                    // encode to JSON, render the result (for AJAX)
                    $json = json_encode($result);
                    echo $json;
                    // leave this loop step
                    break;
                } else {
                    // wait for 1 sec (not very sexy as this blocks the PHP/Apache process, but that's how it goes)
                    sleep(1);
                    continue;
                }

            }


//            $currentTimeStmp = filemtime($file);
//
//            $lastDate = isset($_POST['timestamp']) ? $_POST['timestamp'] : 0;
//
//            while ($currentTimeStmp <= $lastDate) {
//                usleep(1e6); // uspanie na sekundę
//                clearstatcache();
//                $currentTimeStmp = filemtime($file);
//            }
//
//            $array = [];
//
//            $array['timestamp'] = $currentTimeStmp;
//            return new JsonResponse($array);


        }


        return new Response();
    }