I'm trying to implement async RPC for multiple methods and going by their
async greeter [server][1]/[client][2] example, it's not entirely clear how
the server handles different methods as the example only implements a
single method for the server, `SayHello` and there's no corresponding
method named `SayHello` on the server like there is for the [synchronous
version][2].
Instead, the logic for handling `SayHello` seems to be handled in the
`Proceed` function. If I wanted to create another method, do I just handle
it all in Proceed? And if so, how would I do that?
void Proceed() {
if (status_ == CREATE) {
// Make this instance progress to the PROCESS state.
status_ = PROCESS;
// As part of the initial CREATE state, we *request* that the
system
// start processing SayHello requests. In this request, "this"
acts are
// the tag uniquely identifying the request (so that different
CallData
// instances can serve different requests concurrently), in
this case
// the memory address of this CallData instance.
service_->RequestSayHello(&ctx_, &request_, &responder_, cq_,
cq_,
this);
} else if (status_ == PROCESS) {
// Spawn a new CallData instance to serve new clients while we
process
// the one for this CallData. The instance will deallocate
itself as
// part of its FINISH state.
new CallData(service_, cq_);
// The actual processing.
std::string prefix("Hello ");
reply_.set_message(prefix + request_.name());
// And we are done! Let the gRPC runtime know we've finished,
using the
// memory address of this instance as the uniquely identifying
tag for
// the event.
status_ = FINISH;
responder_.Finish(reply_, Status::OK, this);
} else {
GPR_ASSERT(status_ == FINISH);
// Once in the FINISH state, deallocate ourselves (CallData).
delete this;
}
}
[1]:
https://github.com/grpc/grpc/blob/v1.33.2/examples/cpp/helloworld/greeter_async_server.cc
[2]:
https://github.com/grpc/grpc/blob/v1.33.2/examples/cpp/helloworld/greeter_async_client.cc
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