Method startCall

stub/src/main/java/io/grpc/stub/ClientCalls.java:432–437

(
      ClientCall<ReqT, RespT> call,
      StartableListener<RespT> responseListener)

  }

  private static <ReqT, RespT> void startCall(
      ClientCall<ReqT, RespT> call,
      StartableListener<RespT> responseListener) {
    call.start(responseListener, new Metadata());
    responseListener.onStart();
  }

  private abstract static class StartableListener<T> extends ClientCall.Listener<T> {
    abstract void onStart();