@Override
            public ApiFuture<ListWorkstationClustersPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListWorkstationClustersRequest, ListWorkstationClustersResponse>
                    callable,
                ListWorkstationClustersRequest request,
                ApiCallContext context,
                ApiFuture<ListWorkstationClustersResponse> futureResponse) {
              PageContext<
                      ListWorkstationClustersRequest,
                      ListWorkstationClustersResponse,
                      WorkstationCluster>
                  pageContext =
                      PageContext.create(
                          callable, LIST_WORKSTATION_CLUSTERS_PAGE_STR_DESC, request, context);
              return ListWorkstationClustersPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-workstations/google-cloud-workstations/src/main/java/com/google/cloud/workstations/v1beta/stub/WorkstationsStubSettings.java