@Override
    public void hello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
        responseObserver.onNext(buildReply(toMessage(request.getName())));
        responseObserver.onCompleted();
    }
Sends a {@link HelloReply} immediately when receiving a request.
armeria-example/armeria-grpc-server/src/main/java/com/example/grpc/armeria/HelloServiceImpl.java