gistfile1.txt

export class ProductService extends BaseService {
  private channelsObservable: Observable<ChannelsResponse>;

  constructor (protected http: Http) {
    super(http);

    this.channelsObservable = this.makeRequest('channels').cache();
  }

  getChannels(): Observable<ChannelsResponse> {
    return this.channelsObservable;
  }
}