英文:
How to get value from a Mono subscribe call
问题
我有类似这样的东西：
mono.subscribe(val -> doSomething(val));
doSomething 返回一个整数。我想得到并返回该整数，或者一个 Mono<int>。我应该怎么做？
英文:
I have something like this:
mono.subscribe(val -> doSomething(val));
doSomething returns an integer. I would get and return that integer, or a Mono<int>. How can I do?
答案1
得分: 1
要返回 Mono<Integer>，你可以这样做：
Mono<Integer> result = mono.map(value -> doSomething(value));
但要记住，在Reactor中，直到订阅之前什么也不会发生，所以不要忘记订阅：
result.subscribe(System.out::println);
如果你想从Mono中获取一个整数，那么可以用block替换subscribe，但要注意这是一个阻塞操作：
Integer result = mono.map(App2::doSomething).block();
英文:
To return Mono<Integer> you can do the following:
Mono<Integer> result = mono.map(value -> doSomething(value));
But remember that in Reactor, nothing happens until subscribe, so don't forget to subscribe:
result.subscribe(System.out::println);
If you want to get an integer out of mono, then you can replace subscribe with block, but pay attention that this is a blocking operation:
Integer result = mono.map(App2::doSomething).block();
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