@Override
            public ApiFuture<ListRuntimeVersionsPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListRuntimeVersionsRequest, ListRuntimeVersionsResponse> callable,
                ListRuntimeVersionsRequest request,
                ApiCallContext context,
                ApiFuture<ListRuntimeVersionsResponse> futureResponse) {
              PageContext<ListRuntimeVersionsRequest, ListRuntimeVersionsResponse, RuntimeVersion>
                  pageContext =
                      PageContext.create(
                          callable, LIST_RUNTIME_VERSIONS_PAGE_STR_DESC, request, context);
              return ListRuntimeVersionsPagedResponse.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