@Override
    public void startDeframing() {
        deframedRequest.subscribe(this, ctx.eventLoop(), SubscriptionOption.WITH_POOLED_OBJECTS);
    }
Encapsulates the state of a single server call, reading messages from the client, passing to business logic
via {@link ServerCall.Listener}, and writing messages passed back to the response.
grpc/src/main/java/com/linecorp/armeria/server/grpc/StreamingServerCall.java