Hi Vijay,
Thanks a lot for the comments.
So I will implement option 1, probably in a separate thread with the sync
API.
Julien
Le vendredi 2 juin 2017 18:14:34 UTC+2, Julien a écrit :
>
> Hello,
>
> I have a server with several clients. From time to time, the server must
> send a notification to some clients.
> I can’t find a proper way to do this. I had 2 different solutions to do
> that:
>
> 1. Create an RPC function which returns a stream of notifications.
> Something like:
> rpc GetNotification(google.protobuf.Empty) returns (stream Notification)
> {}
>
> The client would call this function “permanently” in a dedicated thread
> with the async interface:
> stub->AsyncGetNotification(...)
> ...
> while (!stopped) {
> nextStatus = completionQueue.AsyncNext(...);
> if (nextStatus == grpc::CompletionQueue::GOT_EVENT) {
> // handle the notification
> ...
> }
> }
>
> On the server side, the GetNotification function would just write the
> notification when there is no notification to send, and would do nothing
> the rest of the time.
> But this means that there would be as many GetNotification functions
> executed at the same time as there are connected clients. I don’t expect to
> have much clients running at the same time (let’s say ~10-20), but I don’t
> like that much.
>
> 2. Create a simple RPC function which returns a notification:
> rpc GetNotification(google.protobuf.Empty) returns (Notification) {}
>
> The client would call it periodically (let’s say every 5 seconds) and
> would handle the notification if there is one, and would do nothing if
> there is none.
> On the server side, the GetNotification function would return an empty
> notification if there is none, or the notification with the appropriate
> data when needed.
> I don’t like this solution much because it is not really efficient.
>
> Is there a better solution than the two above ones?
> Otherwise, which one is the best?
>
> Thanks.
>
> Julien
>
>
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