Ajax polling with Symfony Process component

Although I don't fully understand what you want to create, I have written something similar and looking at it might answer your question:

First I created a Command that does the long-running task:

class GenerateCardBarcodesCommand extends Command {    protected function configure()    {        $this            ->setName('app:generate-card-barcodes')            ->setDescription('Generate the customer cards with barcodes')            ->addArgument('id', InputArgument::REQUIRED, 'id of the Loy/Card entity')        ;    }    protected function execute(InputInterface $input, OutputInterface $output)    {        $id = $input->getArgument('id');        // generate stuff and put them in the database    }}

In the controller the Process is started and there's an ajax action

class CardController extends Controller{    public function newAction(Request $request)    {                // run command in background to start generating barcodes                // NOTE: unset DYLD_LIBRARY_PATH is a fix for MacOSX develop using MAMP.                // @see http://stackoverflow.com/questions/19008960/phantomjs-on-mac-os-x-works-from-the-command-line-not-via-exec                $process = new Process(sprintf('unset DYLD_LIBRARY_PATH ; php ../../apps/spin/console spin:loy:generate-card-barcodes %d', $entity->getId()));                $process->start();                sleep(1); // wait for process to start                // check for errors and output them through flashbag                if (!$process->isRunning())                    if (!$process->isSuccessful())                        $this->get('session')->getFlashBag()->add('error', "Oops! The process fininished with an error:".$process->getErrorOutput());                // otherwise assume the process is still running. It's progress will be displayed on the card index                return $this->redirect($this->generateUrl('loy_card'));     }    public function ajaxCreateBarcodesAction($id)    {        $em = $this->getDoctrine()->getManager();        $entity = $this->getEntity($id);        $count = (int)$em->getRepository('ExtendasSpinBundle:Loy\CustomerCard')->getCount($entity);        return new Response(floor($count / ($entity->getNoCards() / 100)));    }}

// in the twig template the ajax is retrieved, which is simply a number from 0 to 100, which is used in the jquery ui progressbar. {{ 'Processing'|trans }}...

            <script type="text/javascript">            $(function() {                function pollLatestResponse() {                    $.get("{{ path('loy_card_ajax_generate_barcodes', {'id': entity[0].id}) }}").done(function (perc) {                        if (perc == 100)                        {                            clearInterval(pollTimer);                            $('#download-{{entity[0].id}}').show();                            $('#progress-{{entity[0].id}}').hide();                        }                        else                        {                            $('#progress-{{entity[0].id}}').progressbar("value", parseInt(perc));                        }                    });                }                var pollTimer;                $(document).ready(function () {                    $('#progress-{{entity[0].id}}').progressbar({"value": false});                    pollTimer = setInterval(pollLatestResponse, 2000);                });            });            </script>