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    Aaronontheweb commented #4096
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Stephen Riley
@stephen-riley
I'm still not sure why my mylogger ActorSelection isn't carrying context with it, though.
var mylogger = Context.ActorSelection("/user/ConsoleLogger");
Why must I specify my closed-over self as the explicit sender in my call to mylogger.Tell()?
Onur Gumus
@OnurGumus
you don't need.
I thought you were trying to access self.
Stephen Riley
@stephen-riley
var mylogger = Context.ActorSelection("/user/ConsoleLogger");

mylogger.Tell("message");            // this does not work (always from deadLetters)

mylogger.Tell("message}", self);    // this works fine
Onur Gumus
@OnurGumus
that's not normal.
Stephen Riley
@stephen-riley
lol
Good, glad it's not just me. :smile:
Onur Gumus
@OnurGumus
No it's just you.
Stephen Riley
@stephen-riley
lol
Onur Gumus
@OnurGumus
You are probably doing some thing wrong.
Stephen Riley
@stephen-riley
Agreed. :wink:
Onur Gumus
@OnurGumus
mylogger.Tell("message"); // this should just work
Stephen Riley
@stephen-riley
Was hoping someone here would say "oh yeah, do x-y-z and you're fine". Guess I'll pull down source and deep-dive.
Onur Gumus
@OnurGumus
instead try to simplify and isolate the case.
I am sure you will find.
Stephen Riley
@stephen-riley
It totally did work until I put the code inside the lambda I'm passing to ContinueWith().
me-slove
@me-slove
actorselection is probably a reference. in which case you'd be back to the closure problem
Stephen Riley
@stephen-riley
I built the code first just using await httpClient.GetAsync()...
@me-slove , I've tried closing over it, too, and it still didn't work. Which is weird to me, cuz I figured if I'd closed over it, I'd get all the context linked to it and be fine.
me-slove
@me-slove
inside the same code block it should work though. that seems a little odd
Stephen Riley
@stephen-riley
Agreed, @me-slove , it is quite odd. I just re-tested that, still doesn't work.
var self = Self;
var context = Context;

httpClient.GetAsync(req.Url).ContinueWith(responseTask =>
{
    var mylogger = context.ActorSelection("/user/ConsoleLogger");
    var response = responseTask.Result;
    var duration = stopwatch.Elapsed.TotalMilliseconds;
    var msgResponse = new AkkaBlaster.Dto.WebResponse
    {
        StatusCode = response.StatusCode,
        Duration = duration
    };

    mylogger.Tell("message");
},
TaskContinuationOptions.AttachedToParent & TaskContinuationOptions.ExecuteSynchronously);
Onur Gumus
@OnurGumus
@stephen-riley can you actually try to resolve the selection by calling Resolve ?
Stephen Riley
@stephen-riley
The actor mylogger definitely receives the message, but it is from deadLetters, instead of from this httpclient actor.
@OnurGumus , I don't know about Resolve(), but I will try that!
Onur Gumus
@OnurGumus
ActorSelection returns a selection , not an actor ref. You can get an actorRef by calling Resolve on the Selection.
Stephen Riley
@stephen-riley
Do you mean ResolveOne()?
Onur Gumus
@OnurGumus
which may fail if no such actor found.
yes that one
Stephen Riley
@stephen-riley
k, let me try
Onur Gumus
@OnurGumus
I would also move the resolution outside of your lambda.
there is no need to resolve it there. You can resolve before.
me-slove
@me-slove
I haven't looked at the code for Context but what you are seeing for sure is that it is losing itself across the task boundary. It must be that it is derived instead of a variable
Stephen Riley
@stephen-riley
It must be that it is derived instead of a variable
Yeah, @me-slove , looking that way.
@OnurGumus , interestingly, waiting 1 second on the ResolveOne() returned null. Waiting 10 seconds (totally arbitrary) resulted in a good reference.
Onur Gumus
@OnurGumus
that's odd.
Stephen Riley
@stephen-riley
however, still shows all messages as coming from deadLetters. :worried:
I verified with the Identify message that the path is fine.
I think I'm gonna just pull down source and start tracing in. Clearly I have more to understand about the inner workings of Akka.NET when using the TPL patterns. :smile:
me-slove
@me-slove
protected static IActorContext Context
{
get
{
var context = InternalCurrentActorCellKeeper.Current;
if (context == null)
throw new NotSupportedException(
"There is no active ActorContext, this is most likely due to use of async operations from within this actor.");
            return context.ActorHasBeenCleared ? null : context;
        }
    }
it got screwy on the paste but it is definitely derived. here's the code https://github.com/akkadotnet/akka.net/blob/dev/src/core/Akka/Actor/ActorBase.cs
hectorcaban
@hectorcaban
Since I am creating multiple child actors .. how do I do child actors with wildcard routes. ?
Stephen Riley
@stephen-riley
@me-slove, after tracing into the code, I can confirm that InternalCurrentActorCellKeeper.Current is null when inside the ContinueWith() lambda.
So I guess it's just safe to assume that inside ContinueWith() (for this TPL-style IO handling), you have to be explicit because you simply don't have any current actor context for the calls to work with. shrugs
so that's why I have to explicitly specify a sender in Tell(), because of how the normal Tell() is implemented:
        public static void Tell(this IActorRef receiver, object message)
        {
            var sender = ActorCell.GetCurrentSelfOrNoSender();
            receiver.Tell(message, sender);
        }
It would be nice to solve this in the library, but short of making the "current self" concept a stack instead of a singleton, I don't see how to do that nicely. Oh well.