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
Prior to this commit, handler methods in Spring MVC controllers were
not required to provide explicit path mappings via @RequestMapping (or
any of its specializations such as @GetMapping). Such handler methods
were effectively mapped to all paths. Consequently, developers may have
unwittingly mapped all requests to a single handler method.
This commit addresses this by enforcing that @RequestMapping methods
are mapped to an explicit path. Note, however, that this is enforced
after type-level and method-level @RequestMapping information has been
merged.
Developers wishing to map to all paths should now add an explicit path
mapping to "/**" or "**".
Closes gh-22543
WebFlux.fn RouterFunctionDsl#invoke and CoRouterFunctionDsl#invoke
were wrongly exposed on public API and have never been designed to
be used by end users, but rather only invoked from router { } or
coRouter { } builders.
To fix that, avoiding this method being accessible from the DSL and
for the sake of consistency with WebMvc.fn RouterFunctionDsl,
Spring Framework 5.2 turns public fun invoke() method to
an internal fun build() one.
As a consequence RouterFunctionDsl and CoRouterFunctionDsl are not
open anymore, they are expected to be extended via Kotlin
extensions if needed.
Closes gh-22736
LogMessage is an abstract class now: with internal subclasses for Supplier bindings as well as printf-style format strings with a variable number of arguments (some fixed for efficiency, varargs array as fallback), created through corresponding static factory methods.
Closes gh-22726
As of 5.2, ListableBeanFactory.findAnnotationOnBean and its retrieval companions getBeanNamesForAnnotation and getBeansWithAnnotation detect annotations on @Bean methods as well.
Closes gh-22541
This commit changes the main configuration classes for Spring MVC and
Spring WebFlux to not call other bean methods when setting up the web
infrastructure. This allows configuration classes extending
`DelegatingWebFluxConfiguration` and `DelegatingWebMvcConfiguration`
to opt-in the lite-mode, as introduced in gh-22461.
