@Override
            public void onCompleted() {
                responseObserver.onNext(buildReply(toMessage(String.join(", ", names))));
                responseObserver.onCompleted();
            }
Sends a {@link HelloReply} when a request has been completed with multiple {@link HelloRequest}s.
armeria-example/armeria-grpc-server/src/main/java/com/example/grpc/armeria/HelloServiceImpl.java