@Override
            public ApiFuture<ListAcceleratorTypesPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListAcceleratorTypesRequest, ListAcceleratorTypesResponse> callable,
                ListAcceleratorTypesRequest request,
                ApiCallContext context,
                ApiFuture<ListAcceleratorTypesResponse> futureResponse) {
              PageContext<
                      ListAcceleratorTypesRequest, ListAcceleratorTypesResponse, AcceleratorType>
                  pageContext =
                      PageContext.create(
                          callable, LIST_ACCELERATOR_TYPES_PAGE_STR_DESC, request, context);
              return ListAcceleratorTypesPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-tpu/google-cloud-tpu/src/main/java/com/google/cloud/tpu/v2/stub/TpuStubSettings.java