This commit is the first part of a more complete Coroutines
support coming in Spring Framework 5.2. It introduces suspendable
Kotlin extensions for Mono based methods in WebFlux classes like
WebClient, ServerRequest, ServerResponse as well as a Coroutines
router usable via `coRouter { }`.
Coroutines extensions use `await` prefix or `AndAwait` suffix,
and most are using names close to their Reactive counterparts,
except `exchange` in `WebClient.RequestHeadersSpec`
which translates to `awaitResponse`.
Upcoming expected changes are:
- Leverage `Dispatchers.Unconfined` (Kotlin/kotlinx.coroutines#972)
- Expose extensions for `Flux` based API (Kotlin/kotlinx.coroutines#254)
- Introduce interop with `CoroutineContext` (Kotlin/kotlinx.coroutines#284)
- Support Coroutines in `ReactiveAdapterRegistry`
- Support Coroutines for WebFlux annotated controllers
- Fix return type of Kotlin suspending functions (gh-21058)
See gh-19975
Prior to this commit, the `ExchangeFilterFunction` instances configured
on a `WebClient` instance would be executed as soon as the `exchange`
method would be called. This behavior is not consistent with the server
side and can confuse filter developers as they'd need to manually
`Mono.defer()` their implementations if they want to record metrics.
This commit defers all `ExchangeFilterFunction` processing at
subscription time.
Fixes gh-22375
Prior to this commit, profiling sessions would show that using
`java.util.stream.Stream` in some hot code paths creates significant
garbage.
Where streams aren't really required, this commit turns those snippets
into imperative logic because those are likely to be called once or
multiple times per request.
Closes gh-22341
Prior to this commit, Spring WebFlux function would let
`DecodingException` thrown by codecs bubble up to the web handler level.
Since this exception is not handled by default there, the response would
be turned into a HTTP 500 status.
In the annotation model, `ArgumentResolver` implementations wrap this
exception with a `ServerWebInputException`, which itself extends
`ResponseStatusException`. The latter is supported by the error handling
infrastructure as a HTTP 400 response.
This commit ensures that `DecodingException` instances are properly
wrapped in `ServerWebInputException` at the `ServerRequest` level
directly, thus supporting all setup modes ("standalone" and through the
`DispatcherHandler`).
Fixes#22290
Typically a straight up equals as well as Collections#contains
checks for MediaType.ALL is susceptible to the presence of
media type parameters.
This commits adds equalsTypeAndSubtype as well as an
isPresentIn(Collection<MimeType>) methods to MimeType to faciliate
with checks for MediaType.ALL.
Issue: SPR-17550
Prior to this commit, one could write a `CharSequence` to an existing
`DataBuffer` instance by turning it into a byte array or `ByteBuffer`
first. This had the following disadvantages:
1. Memory allocation was not efficient (not leveraging pooled memory
when available)
2. Dealing with `CharsetEncoder` is not always easy
3. `DataBuffer` implementations, like `NettyDataBuffer` can use
optimized implementations in some cases
This commit adds a new `DataBuffer#write(CharSequence, Charset)` method
for those cases and also an `ensureCapacity` method useful for checking
that the current buffer has enough capacity to write to it..
Issue: SPR-17558
Commit #c187cb2 introduced proactive rejection of multiple subscribers
in ReactorClientHttpResponse, instead of hanging indefinitely as per
https://github.com/reactor/reactor-netty/issues/503.
However FluxReceive also rejects subsequent subscribers if the response
is consumed fully, as opposed to being canceled, e.g. as with
bodyToMono(Void.class). In that case, a subsequent subscriber causes
two competing error signals to be sent, and one gets dropped and
logged by reactor-core.
This fix ensures that a rejection is raised in
ReactorClientHttpResponse only after a cancel() was detected.
Issue: SPR-17564
Sebastien Deleuze
Ryan Scheidter
Brian Clozel
Juergen Hoeller
Rossen Stoyanchev
Arjen Poutsma
Kamil Szymanski
Johnny Lim
Hanope