Hello Peter,
I’m leaning towards implementing this as Actors actually, but it’s
certainly possible to extend event-buses with what you require.
Just make sure to delegate to super first.
In your case you could reply to it right from the subscribe.
Please remember that a Bus is NOT an Actor, so you’re entering
not-thread-safe-land. You will have to keep your state in an
AtomicReference[T] to be safe etc.
(This on the other hand you would not be forced to do if you implement this
in terms of plain Actors).
override def subscribe(subscriber: Subscriber, to: Classifier): Boolean =
super.subscribe(subscriber, to) && { subscriber ! "Welcome bob! Last
thing was ${thing.get}"; true }
When extending one of our provided *BusImpl classes (a list is here
http://doc.akka.io/docs/akka/2.3.3/scala/event-bus.html).
I’d still recommend at least trying out to implement as plain Actors, and
if you’re convinced you want the Bus impl, giving it a shot.
In Actors you’re thread safe, and easier to swap out or add mode behavior
later on.
On Fri, Jun 20, 2014 at 5:58 PM, Peter Lappo <peter.la...@gmail.com> wrote:
> Was going to use EventBus to publish prices to actors until I realised
> actors arriving at party late don't get to see the last price and have to
> wait for the next one to be published.
>
> Are there any extensions that re-publish the last message to new
> subscribers?
>
> Alternatives
> Roll my own publisher and just use standard akka messages.
> Akka persistence is an over kill as I don't need the transaction log.
>
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Cheers,
Konrad 'ktoso' Malawski
hAkker - Typesafe, Inc
<http://scaladays.org>
--
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>>>>>>>>>> Check the FAQ:
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>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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