35052f2113
This commit adds support for `@Scheduled` annotation on reactive methods and Kotlin suspending functions. Reactive methods are methods that return a `Publisher` or a subclass of `Publisher`. The `ReactiveAdapterRegistry` is used to support many implementations, such as `Flux`, `Mono`, `Flow`, `Single`, etc. Methods should not take any argument and published values will be ignored, as they are already with synchronous support. This is implemented in `ScheduledAnnotationReactiveSupport`, which "converts" Publishers to `Runnable`. This strategy keeps track of active Subscriptions in the `ScheduledAnnotationBeanPostProcessor`, in order to cancel them all in case of shutdown. The existing scheduling support for tasks is reused, aligning the triggering behavior with the existing support: cron, fixedDelay and fixedRate are all supported strategies. If the `Publisher` errors, the exception is logged at warn level and otherwise ignored. As a result new `Runnable` instances will be created for each execution and scheduling will continue. The only difference with synchronous support is that error signals will not be thrown by those `Runnable` tasks and will not be made available to the `org.springframework.util.ErrorHandler` contract. This is due to the asynchronous and lazy nature of Publishers. Closes gh-23533 Closes gh-28515
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