Hi Christian,
thanks for your response.
Am Freitag, 12. Oktober 2018 11:53:21 UTC+2 schrieb Christian Rivasseau:
>
>
> 1: It is indeed very much possible to have multiple methods, you just need
> to arrange for your own CallData object that will
> handle different methods. Depending on your style you could:
> - Have a enum in the CallData constructor that describe which method is
> handled, and switch on that.
> - Use inheritance (have a CallData subclass for each GRPC method).
> - Takes functors that perform the work as arguments.
>
OK, this is pretty much what I did already. My problem is, at which point
do I know which method is called? Let me use that modified HandleRpcs()
example to explain:
Suppose I went for your second choice and have a type per call.
void MyServerImpl::HandleRpcs() {
// Spawn a new CallData instance for each method. Is that right?
new MyFirstMethod(&m_service_instance, m_cq.get());
new MySecondMethod(&m_service_instance, m_cq.get());
void* tag; // uniquely identifies a request.
bool ok;
while (true) {
// Block waiting to read the next event from the completion queue. The
// event is uniquely identified by its tag, which in this case is the
// memory address of a CallData instance.
// The return value of Next should always be checked. This return value
// tells us whether there is any kind of event or cq_ is shutting down.
if (!m_cq->Next(&tag, &ok)) break;
MOOSE_ASSERT(ok);
// This here:
// How do I know which call it is? To which type do I cast this tag void
ptr? The first or the second?
static_cast<MyFirstMethod *>(tag)->proceed();
}
}
> Then when your server starts you will need to instantiate the first
> CallData object for each method.
>
> 2: The example is indeed synchronous in its process phase. In real life
> you will be offloading work to some thread pool,
> or calling async services of your own, and then you can call
> responder_->Finish() once that is done.
>
OK, so my separate io_context approach will provide that just fine.
Thanks!
Stephan
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