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20 lines
1.3 KiB
20 lines
1.3 KiB
[[webflux-reactive-libraries]] |
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= Reactive Libraries |
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`spring-webflux` depends on `reactor-core` and uses it internally to compose asynchronous |
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logic and to provide Reactive Streams support. Generally, WebFlux APIs return `Flux` or |
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`Mono` (since those are used internally) and leniently accept any Reactive Streams |
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`Publisher` implementation as input. |
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When a `Publisher` is provided, it can be treated only as a stream with unknown semantics (0..N). |
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If, however, the semantics are known, you should wrap it with `Flux` or `Mono.from(Publisher)` instead |
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of passing the raw `Publisher`. |
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The use of `Flux` versus `Mono` is important, because it helps to express cardinality -- |
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for example, whether a single or multiple asynchronous values are expected, |
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and that can be essential for making decisions (for example, when encoding or decoding HTTP messages). |
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For annotated controllers, WebFlux transparently adapts to the reactive library chosen by |
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the application. This is done with the help of the |
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{spring-framework-api}/core/ReactiveAdapterRegistry.html[`ReactiveAdapterRegistry`], which |
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provides pluggable support for reactive library and other asynchronous types. The registry |
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has built-in support for RxJava 3, Kotlin coroutines and SmallRye Mutiny, but you can |
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register others, too.
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