Add support for functions that return a Future

[pragnagopa]

Add support for functions to run async. For example

 @FunctionName("HttpTrigger-JavaAsync")
    public CompletableFuture<HttpResponseMessage> runAsync(
            @HttpTrigger(name = "req", methods = {HttpMethod.GET, HttpMethod.POST}, authLevel = AuthorizationLevel.FUNCTION) HttpRequestMessage<Optional<String>> request,
            final ExecutionContext context)

Java worker should inspect function method signature, if it returns a Future invoke it asynchronously
and if not invoke the method synchronously.

[pragnagopa]

@anuchandy @selvasingh

[daniel-rocha]

@pragnagopa was this ever implemented?

[pragnagopa]

Not yet. We are tracking this as a feature request.

[Kondamon]

@pragnagopa @amamounelsayed

Is it possible to receive async responses with azure functions? Because I don't receive any errors when the mail can not be sent which I receive on my local environment (e.g. 500 - Internal Server error, when password is wrong).

Source from: https://quarkus.io/guides/mailer#sending-simple-emails

GET
@Path("/async")
public CompletionStage<Response> sendASimpleEmailAsync() {
    return reactiveMailer.send(
            Mail.withText("to@acme.org", "A reactive email from quarkus", "This is my body"))
            .subscribeAsCompletionStage()
            .thenApply(x -> Response.accepted().build());
}

[vovikdrg]

How about returning Mono or Flux?