quarkus的异步操作，神奇

1

    public Uni<String> greeting(String name) {
        return Uni.createFrom().item(name)
                .onItem().transform(n -> String.format("hello %s", name));
    }

2

 public Multi<String> greetings(int count, String name) {
        return Multi.createFrom().ticks().every(Duration.ofSeconds(1))
                .onItem().transform(n -> String.format("hello %s - %d", name, n))
                .select().first(count);

    }