have moved to the lightbend forum.

On Wednesday, 4 April 2018 12:39:22 UTC+1, daz...@gmail.com wrote:
> Hi, 
> I am playing around with supervision in Java Akka 2.5.8 / 2.12.  
> I would like to have the ability to decorate any old actor's behaviour 
> with retry logic.
> I have the following:
> https://pastebin.com/3qV8kDfz
> A number of questions:
> 1) The exception thrown by the SupervisedActor is logged as an error:
> 11:43:00.542 [TestActorSystem-akka.actor.default-dispatcher-3] ERROR 
> OneForOneStrategy - 
> nullcom.tesco.payments.async.TestSupervisionDocs$RestartMe: null
> at 
> com.tesco.payments.async.TestSupervisionDocs$PrinterActor.lambda$createReceive$0(TestSupervisionDocs.java:66)
> It's not clear to me that I've done things correctly - what's the 'null' 
> for? 
> Also, is there a way to not have this logged as an error?
> 2) I had to use Backoff.onStop(...) rather than what seemed more intuitive 
> Backoff.onFailure(...). Are there any issues I should be aware off with 
> this?
> 3) In the SupervisedActor, I have overridden preRestart, which after a 
> restart, sends the parent (supervisor) the failed message again, with the 
> original sender. 
> sending to self rather than supervisor didn't work, don't understand why?
> In any case is there a way to have the supervisor send the message again? 
> Then the supervised actor would not need to be aware of its supervision nor 
> know its parent is something special, nor contain part of the retry logic. 
> One way I can think off is to have the thrown exception contain the 
> message, supervised actor and original sender, and then have supervisor 
> send it to itself:
> DeciderBuilder
>         .match(RestartMe.class, e -> {
>             System.out.println("RETRY caught------------------");
>             e.self.tell(e.msg, e.sender);
>             return restart();
>         })
> However this still requires the SupervisedActor having some involvement in 
> the process (throwing an exception with information specific to retry), and 
> seems a bit ugly.
> Help / thoughts much appreciated!
> daz

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