code: public ServiceFuture<List<RecommendationInner>> listRecommendedRulesForWebAppAsync(final String resourceGroupName, final String siteName, final Boolean featured, final String filter, final ListOperationCallback<RecommendationInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listRecommendedRulesForWebAppSinglePageAsync(resourceGroupName, siteName, featured, filter),
              new Func1<String, Observable<ServiceResponse<Page<RecommendationInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<RecommendationInner>>> call(String nextPageLink) {
                      return listRecommendedRulesForWebAppNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: Get all recommendations for an app.
  Get all recommendations for an app.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param siteName Name of the app.
  @param featured Specify &lt;code&gt;true&lt;/code&gt; to return only the most critical recommendations. The default is &lt;code&gt;false&lt;/code&gt;, which returns all recommendations.
  @param filter Return only channels specified in the filter. Filter is specified by using OData syntax. Example: $filter=channels eq 'Api' or channel eq 'Notification'
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object