5 mar 2014 kl. 16:52 skrev Suriyanto Lee <[email protected]>:
> Viktor,
>
> Thanks for the reply. It makes sense and it will simulate Cancel message.
>
> Do you have suggestion on how to do this when the message queue have more
> than 1 messages? In my case, the message queue can have multiple processing
> messages, so the Cancel message could be at the end of the queue still and I
> shouldn't process the next message before the original message is completely
> processed.
For that you can use Stash:
class Worker extends Actor with Stash {
val idle: Receive = {
case NewWork(x) =>
self forward DoSomeWork(x)
context.become(active(idFor(x))
}
def active(id: Long): Receive = {
case _: NewWork => stash()
case DoSomeWork(x) if idFor(x) == id => self forward DoSomeWork(doWork(x))
case Cancel => context.become(idle)
}
def receive = idle
…
}
The `id` is necessary not to confuse previous DoSomeWork messages with current
ones (after cancellation).
Regards,
Roland
>
> Does this mean that I should change my queue to priority queue that will give
> priority to Cancel message?
>
> Thanks,
> Suriyanto
>
> On Wednesday, March 5, 2014 2:03:57 AM UTC-8, √ wrote:
> A technique I prefer is the following:
>
> case object Continue
> case object Cancel
>
> class Worker extends Actor {
> def receive = {
> case Continue =>
> doSmallChunkOfWork()
> self forward Continue
> case Cancel => context stop self
> }
> }
>
>
> On Wed, Mar 5, 2014 at 1:12 AM, Suriyanto Lee <[email protected]> wrote:
> Hello,
>
> We have an Akka actor system running where some actors can process a short
> message (<10 secs) and some actors could take up to 20 minutes. At times,
> users might decide to cancel the process.
>
> We originally implement calling Stop on the actor, but it caused too much lag
> for user when long message are being processed. Afterwards we modified the
> actor so that it will perform periodic checks for a cancel flag. The second
> implementation makes the cancellation to be more responsive, but does not
> scale well as the number of actors increased.
>
> What is the pattern or best practice in Akka for this case? Is there a way to
> broadcast an interrupt message to actors for cancelation?
>
> Thanks,
> Suriyanto
>
> --
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>
>
> --
> Cheers,
> √
>
> ———————
> Viktor Klang
> Chief Architect - Typesafe
>
> Twitter: @viktorklang
>
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
> >>>>>>>>>> Check the FAQ: http://akka.io/faq/
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Dr. Roland Kuhn
Akka Tech Lead
Typesafe – Reactive apps on the JVM.
twitter: @rolandkuhn
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