When to use Mono> and when Flux

Question

I'm using Spring web-flux with Reactor and for me is not clear when RestController method should return

Mono <List<Object>> and when Flux<Object>.

Could you provide some case when to use each of them?

score 13 · Accepted Answer · answered Oct 24 '18 at 09:34

13

Flux<Object> indicates that new Object instances can be pushed in a reactive way at any point. With Mono<List<Object>>, you will get 1 time a value that is a list of objects, but that list will never change.

See also Mono vs Flux in Reactive Stream

answered Oct 24 '18 at 09:34

Wim Deblauwe

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So in case of a normal API exposed by a Spring RestController, assuming this API will expose a list of items (users' owned cars, for example), reading at your response I should choose `Mono>` instead of `Flux – Marco Apr 06 '21 at 07:03
The answer to your question is: yes, that's correct. – Marcos Aug 21 '21 at 07:33

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