gRPC: Role of the ClientAsyncStreamingInterface.Finish() and the CompleitionQueue











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I'm trying to understand the greeter_async_client.cc from the helloworld example of the gRPC docs.



With respect to line 76:
rpc->Finish(&reply, &status, (void*)1);



The api reference mentions that the ClientAsyncStreamingInterface::Finish() function will return if:




This function will return when either:




  • all incoming messages have been read and the server has returned a status.

  • the server has returned a non-OK status.

  • the call failed for some reason and the library generated a status.




Does this mean that Finish() is blocking? And if it is, then what is the role of the CompletionQueue. Can't we just read the response once the Finish() call returns?






grpc







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    up vote
    0
    down vote

    favorite












    I'm trying to understand the greeter_async_client.cc from the helloworld example of the gRPC docs.



    With respect to line 76:
    rpc->Finish(&reply, &status, (void*)1);



    The api reference mentions that the ClientAsyncStreamingInterface::Finish() function will return if:




    This function will return when either:




    • all incoming messages have been read and the server has returned a status.

    • the server has returned a non-OK status.

    • the call failed for some reason and the library generated a status.




    Does this mean that Finish() is blocking? And if it is, then what is the role of the CompletionQueue. Can't we just read the response once the Finish() call returns?






    grpc







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I'm trying to understand the greeter_async_client.cc from the helloworld example of the gRPC docs.



      With respect to line 76:
      rpc->Finish(&reply, &status, (void*)1);



      The api reference mentions that the ClientAsyncStreamingInterface::Finish() function will return if:




      This function will return when either:




      • all incoming messages have been read and the server has returned a status.

      • the server has returned a non-OK status.

      • the call failed for some reason and the library generated a status.




      Does this mean that Finish() is blocking? And if it is, then what is the role of the CompletionQueue. Can't we just read the response once the Finish() call returns?






      grpc







      share|improve this question













      I'm trying to understand the greeter_async_client.cc from the helloworld example of the gRPC docs.



      With respect to line 76:
      rpc->Finish(&reply, &status, (void*)1);



      The api reference mentions that the ClientAsyncStreamingInterface::Finish() function will return if:




      This function will return when either:




      • all incoming messages have been read and the server has returned a status.

      • the server has returned a non-OK status.

      • the call failed for some reason and the library generated a status.




      Does this mean that Finish() is blocking? And if it is, then what is the role of the CompletionQueue. Can't we just read the response once the Finish() call returns?






      grpc




      grpc






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      share|improve this question










      asked Nov 7 at 20:30









      ConfusedSoul

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