With a completion queue and using the async API, you could be multiplexing 
thousands of bidi streams on a single thread, and some applications really 
need that - most however don't. If you're not in that category, I'd 
encourage you to stick with the synchronous API's and keep your code 
simple: the async API is substantially harder to work with.

On Friday, September 9, 2016 at 1:08:20 AM UTC-7, Michael Leonard wrote:
>
>
> Hi 
>
> I'm new to grpc (love it so far!) and have a helloworld bidirectional 
> streaming example working in C++. I made this by going through the 
> helloworld and route_guide examples and combining the two so I can stream 
> HelloRequest and HelloResponse messages back and forth between the C++ 
> client and C++ server in any order I choose.
>
> *My question is:* is there such a thing as 'async bidirectional 
> streaming'? 
>
> My understanding of async in the single non-streaming case is that it 
> allows the program to do something else and not block while waiting for the 
> response to the rpc. In the bidirectional streaming case I believe I can 
> send something from the client to the server, do something else, send 
> something else, etc... and so achieve the same non-blocking feature. 
>
> *Do I gain anything by implementing the completion queue in bidirectional 
> streaming case, or is it only useful for the non-streaming variants??* 
> i.e. have I got already got the most general/flexible option already 
> working, or would using a completion queue in my bidirectional streaming 
> code give me any extra features/advantages/possibilities?
>
>
> Thanks very much in advance!
>
> Mike
>

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