code: public Observable<ServiceResponse<Page<DataLakeStoreAccountInformationInner>>> listByAccountSinglePageAsync(final String resourceGroupName, final String accountName) {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (accountName == null) {
              throw new IllegalArgumentException("Parameter accountName is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          final String filter = null;
          final Integer top = null;
          final Integer skip = null;
          final String select = null;
          final String orderby = null;
          final Boolean count = null;
          return service.listByAccount(this.client.subscriptionId(), resourceGroupName, accountName, filter, top, skip, select, orderby, count, this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<DataLakeStoreAccountInformationInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<DataLakeStoreAccountInformationInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<DataLakeStoreAccountInformationInner>> result = listByAccountDelegate(response);
                          return Observable.just(new ServiceResponse<Page<DataLakeStoreAccountInformationInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Gets the first page of Data Lake Store accounts linked to the specified Data Lake Analytics account. The response includes a link to the next page, if any.
  
  @param resourceGroupName The name of the Azure resource group.
  @param accountName The name of the Data Lake Analytics account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;DataLakeStoreAccountInformationInner&gt; object wrapped in {@link ServiceResponse} if successful.