james strachan created CXF-6833:
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Summary: support RxJava Observable<T> in return values as a more
composeable alternative to Future<T>
Key: CXF-6833
URL: https://issues.apache.org/jira/browse/CXF-6833
Project: CXF
Issue Type: Improvement
Reporter: james strachan
when invoking multiple REST services concurrently in a microservice kinda world
it can be really helpful to use RxJava's Observable<T> so that you can easily
compose concurrent asynchronous requests together.
e.g. see this blog:
http://joluet.github.io/blog/2014/07/07/rxjava-retrofit/
Its basically about using RxJava's Observable<T> as the result type; which is a
little like a Future<T> but can handle streams of values and is composable.
It would be great to do this both on the client and server side; as a server
may invoke multiple asynchronous back ends and return a composition of results
etc.
e.g.
{code}
@GET("/session.json")
Observable<LoginResponse> login();
@GET("/user.json")
Observable<UserState> getUserState();
{code}
you can then use the Observable<T> composition methods to join / flatMap to
compose multiple requests across different microservice invocations together
with timeouts etc e.g. to compose the latest from 2 calls:
{code}
Observable.combineLatest(api.fetchUserProfile(), api.getUserState(),
(user, userStatus) -> new Pair<>(user, userStatus));
{code}
and you're done! There's support for timeouts and other kinds of composition
mechanisms too.
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