.js

class ContentCtrl {
  constructor($scope, contentItems) {
    this.readyIntervals = []; // $interval for each content item that we're checking "ready" status of
    
    $scope.$on('$destroy', () => {
      this.readyIntervals.forEach($interval.cancel.bind($interval));
    });
    
    this.contentItems = contentItems;
    this.contentItems.forEach(this.getReadyStatus.bind(this));
  }
  
  getReadyStatus(item) {
    const TIME_TO_WAIT = 10000;
    const POLLING_INTERVAL = 1000;
    
    const interval = $interval(() => {
      $http.get(url)
        .then((res) => {
          if (res.data.status === 'Ready') {
            $interval.cancel(interval);
            this.readyIntervals.splice(this.readyIntervals.indexOf(interval));
            item.status = 'Ready';
          }
        })
    }, POLLING_INTERVAL);
    
    
    this.readyIntervals.push(interval);
    
    $timeout(() => {
      $interval.cancel(interval);
      this.readyIntervals.splice(this.readyIntervals.indexOf(interval));
    }, TIME_TO_WAIT);
  }
  
  
}