+/**
+ * Class representing a RPC request - zero or more identical responses to a
+ * single request message with a response
+ */
+template <typename Req, typename Resp, typename StreamMessage,
+ typename... Args>
+class Stream : public Common_req
+{
+public:
+ Stream (
+ Connection &con, Args... args,
+ std::function<vapi_error_e (Stream<Req, Resp, StreamMessage, Args...> &)>
+ cb = nullptr)
+ : Common_req{ con }, request{ con, vapi_alloc<Req> (con, args...) },
+ response{ con, nullptr }, result_set{ con }, callback{ cb }
+ {
+ }
+
+ Stream (const Stream &) = delete;
+
+ virtual ~Stream () {}
+
+ virtual std::tuple<vapi_error_e, bool>
+ assign_response (vapi_msg_id_t id, void *shm_data)
+ {
+ if (id == response.get_msg_id ())
+ {
+ response.assign_response (id, shm_data);
+ result_set.mark_complete ();
+ set_response_state (RESPONSE_READY);
+ if (nullptr != callback)
+ {
+ return std::make_pair (callback (*this), true);
+ }
+ return std::make_pair (VAPI_OK, true);
+ }
+ else
+ {
+ result_set.assign_response (id, shm_data);
+ }
+ return std::make_pair (VAPI_OK, false);
+ }
+
+ vapi_error_e
+ execute ()
+ {
+ return con.send (this);
+ }
+
+ const Msg<Req> &
+ get_request (void)
+ {
+ return request;
+ }
+
+ const Msg<Resp> &
+ get_response (void)
+ {
+ return response;
+ }
+
+ using resp_type = typename Msg<StreamMessage>::shm_data_type;
+
+ const Result_set<StreamMessage> &
+ get_result_set (void) const
+ {
+ return result_set;
+ }
+
+private:
+ Msg<Req> request;
+ Msg<Resp> response;
+ Result_set<StreamMessage> result_set;
+ std::function<vapi_error_e (Stream<Req, Resp, StreamMessage, Args...> &)>
+ callback;
+
+ friend class Connection;
+ friend class Result_set<StreamMessage>;
+};
+