Ojs\AnalyticsBundle\Listener\AnalyticsSubscriber::onJournalView PHP Method

    public function onJournalView(ViewJournalEvent $event)
    {
        $journal = $event->getJournal();
        $stat = $this->em->getRepository('OjsAnalyticsBundle:JournalStatistic')->findOneBy(['date' => new \DateTime(), 'journal' => $journal]);
        if (!$stat) {
            $stat = new JournalStatistic();
            $stat->setDate(new \DateTime());
            $stat->setJournal($journal);
            $stat->setView(1);
        } else {
            $stat->setView($stat->getView() + 1);
        }
        $journal->increaseViewCount();
        $this->em->persist($journal);
        $this->em->persist($stat);
        $this->em->flush();
    }