@Override
  public <RequestT, ResponseT, MetadataT>
      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
          GrpcCallSettings<RequestT, Operation> grpcCallSettings,
          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
          ClientContext clientContext,
          OperationsStub operationsStub) {
    return GrpcCallableFactory.createOperationCallable(
        grpcCallSettings, callSettings, clientContext, operationsStub);
  }
gRPC callable factory implementation for the StorageBatchOperations service API.

<p>This class is for advanced usage.
java-storagebatchoperations/google-cloud-storagebatchoperations/src/main/java/com/google/cloud/storagebatchoperations/v1/stub/GrpcStorageBatchOperationsCallableFactory.java