a8d6ba9965
Flow is a Kotlin Coroutines related cold asynchronous stream of the data, that emits from zero to N (where N can be unbounded) values and completes normally or with an exception. It is conceptually the Coroutines equivalent of Flux with an extension oriented API design, easy custom operator capabilities and some suspending methods. This commit leverages Flow <-> Flux interoperability to support Flow on controller handler method parameters or return values, and also adds Flow based extensions to WebFlux.fn. It allows to reach a point when we can consider Spring Framework officially supports Coroutines even if some additional work remains to be done like adding interoperability between Reactor and Coroutines contexts. Flow is currently an experimental API that is expected to become final before Spring Framework 5.2 GA. Close gh-19975
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