code: public Observable<ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>>> listAuthorizationRulesWithServiceResponseAsync(final String resourceGroupName, final String namespaceName, final String notificationHubName) {
          return listAuthorizationRulesSinglePageAsync(resourceGroupName, namespaceName, notificationHubName)
              .concatMap(new Func1<ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>>, Observable<ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>>> call(ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(listAuthorizationRulesNextWithServiceResponseAsync(nextPageLink));
                  }
              });
      }
docs: Gets the authorization rules for a NotificationHub.
  
  @param resourceGroupName The name of the resource group.
  @param namespaceName The namespace name
  @param notificationHubName The notification hub name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;SharedAccessAuthorizationRuleResourceInner&gt; object