code: public Observable<ServiceResponse<Page<FileServerInner>>> listByWorkspaceSinglePageAsync(final String resourceGroupName, final String workspaceName, final FileServersListByWorkspaceOptions fileServersListByWorkspaceOptions) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (workspaceName == null) {
              throw new IllegalArgumentException("Parameter workspaceName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          Validator.validate(fileServersListByWorkspaceOptions);
          Integer maxResults = null;
          if (fileServersListByWorkspaceOptions != null) {
              maxResults = fileServersListByWorkspaceOptions.maxResults();
          }
          return service.listByWorkspace(resourceGroupName, workspaceName, this.client.subscriptionId(), this.client.apiVersion(), this.client.acceptLanguage(), maxResults, this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<FileServerInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<FileServerInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<FileServerInner>> result = listByWorkspaceDelegate(response);
                          return Observable.just(new ServiceResponse<Page<FileServerInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Gets a list of File Servers associated with the specified workspace.
  
  ServiceResponse<PageImpl<FileServerInner>> * @param resourceGroupName Name of the resource group to which the resource belongs.
  ServiceResponse<PageImpl<FileServerInner>> * @param workspaceName The name of the workspace. Workspace names can only contain a combination of alphanumeric characters along with dash (-) and underscore (_). The name must be from 1 through 64 characters long.
  ServiceResponse<PageImpl<FileServerInner>> * @param fileServersListByWorkspaceOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;FileServerInner&gt; object wrapped in {@link ServiceResponse} if successful.