how-to-controller-2.js

constructor() {
  // You have to call the super() method to initialize the base class.
  super();
  this._suHandler = this.onStorageUpdate.bind(this);
}

loadView(state) {
  console.log('counter: loadView', state);
  
  this.storage.subscribe(['count'], this._suHandler);
  switch (state.type) {
    case 'email-thread':
      return {
        html: 'email-thread.html',
        data: {}
      };
    case 'summary':
      return {
        html: 'summary.html',
        data: this.getCount()
      };
    default:
      console.error('counter: unknown Sift type: ', state.type);
    }
  }

  // Event: storage update
  onStorageUpdate(value) {
    console.log('counter: onStorageUpdate: ', value);
    return this.getCount().then(xe => {
      // Publish events from 'x' to view
      this.publish('counts', xe);
    });
  }

  getCount() {
    return this.storage.get({
      bucket: 'count',
      keys: ['word_count']
    }).then((values) => {
      console.log('counter: getCount returned:', values);
      return values[0];
    });
  }

}