code: public Observable<Page<WorkspaceInner>> listAsync(final WorkspacesListOptions workspacesListOptions) {
          return listWithServiceResponseAsync(workspacesListOptions)
              .map(new Func1<ServiceResponse<Page<WorkspaceInner>>, Page<WorkspaceInner>>() {
                  @Override
                  public Page<WorkspaceInner> call(ServiceResponse<Page<WorkspaceInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets a list of Workspaces associated with the given subscription.
  
  @param workspacesListOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;WorkspaceInner&gt; object