Dependency Injection in Ember using Singleton

initializers..poller.js

import Poller from '../utils/poller';

export function initialize(container, application) {
  var poller = Poller.create();
  
  // this works but I want a singleton
  // application.register('poller:main', poller, { instantiate: false });
  application.register('poller:main', poller);
  application.inject('route', 'poller', 'poller:main');
  application.inject('controller', 'poller', 'poller:main');
}

export default {
  name: 'poller',
  initialize: initialize
};

routes..index.js

import Ember from 'ember';

export default Ember.Route.extend({
  setupController: function() {
    this.poller.start();
  }
});

utils..poller.js

import Ember from 'ember';

export default Ember.Object.extend({
  interval: function() {
    return 5000; // Time between polls (in ms)
  }.property().readOnly(),

  // Schedules the function `f` to be executed every `interval` time.
  schedule: function(f) {
    return Ember.run.later(this, function() {
      f.apply(this);
      this.set('timer', this.schedule(f));
    }, this.get('interval'));
  },

  // Stops the pollster
  stop: function() {
    Ember.run.cancel(this.get('timer'));
  },

  // Starts the pollster, i.e. executes the `onPoll` function every interval.
  start: function() {
    this.set('timer', this.schedule(this.get('onPoll')));
  },

  onPoll: function() {
    Ember.Logger.log('basic poller overwrite with your method');
  }
});