/**
  * {@inheritdoc}
  */
 public function stopTracking(User $user)
 {
     $tracker = $this->trackerRepository->retrieveUserTracker($user);
     if ($tracker) {
         $this->processStopTracking($tracker);
     }
 }
 /**
  * @return Tracker
  */
 public function userTracker()
 {
     $token = $this->securityContext->getToken();
     $user = $token ? $token->getUser() : null;
     return $this->trackerRepository->retrieveUserTracker($user);
 }