akkadotnet/akka.net

Port of Akka actors for .NET

Scott Martin

@Scott__Martin_twitter

Got it, would an IoC make it easier?

Aaron Stannard

@Aaronontheweb

then you'd have two problems

as you'd need to bind your singleton IActorRef and distinguish it from any other IActorRefs you might need to pass around to other objects

but I've done that before too

needed it to inject actor references into controllers

Scott Martin

@Scott__Martin_twitter

ah, good point

Is there a common pattern for injection messages from outside the ActorSystem?

Aaron Stannard

@Aaronontheweb

you can always pass a message to any IActorRef from anywhere

Scott Martin

@Scott__Martin_twitter

For now the static ref isn't so bad as it is to only maintain backwards compatibility for the time being.

Aaron Stannard

@Aaronontheweb

and any top-level actors declared via ActorSystem.ActorOf are easily passable to external contexts

Scott Martin

@Scott__Martin_twitter

@Aaronontheweb Thank you for the information!

Aaron Stannard

@Aaronontheweb

@alexvaluyskiy figured out that consistent hash router race condition

it's a side-effect of having that actor start as a RepointableActorRef

if the actor cell doesn't start right away (talking like nanoseconds here)

the call to check to see how many children the router has, the first call, will fail

because the actor startup is asynchronous now

I think I can fix that

Aaron Stannard

@Aaronontheweb

(TL;DR; it's an issue with how the test is designed)

Aaron Stannard

@Aaronontheweb

added a fix just now akkadotnet/akka.net#2112

qwoz

@qwoz

what's the best way to visualize the actor hierarchy when debugging? Something akin to Visual Studio's Locals tab where you can drill down a tree structure to find something like:

MyActorSystem > user > MyActor > ChildActor > OtherActor [terminated]

Aaron Stannard

@Aaronontheweb

nothing built into Akka.NET for that

but what you can do inside the VS debugger

is grab ahold of the Context

inside a watch

and then expand the Children collection, whatever it is called

and from there you should be able to do that recursively for local actors at least

qwoz

@qwoz

yeah, I can do this crudely when debugging a test using this > base > base > base > Sys > base > Guardian > base > Children ... was hoping there was something a tad nicer. :smile:

to11mtm

@to11mtm

@qwoz, not sure if it would help for your use case but have you seen the visualizer? https://www.nuget.org/packages/Akka.Visualizer/

fouimette

@fouimette

Hello!

I am running through a tutorial on PluralSight (that is a little outdated) and am using the Terminate() method followed by the WhenTerminated task. What I get is a "DeathWatchNofitification message was not delivered" error. Any thoughts?

fouimette

@fouimette

Bartosz Sypytkowski

@Horusiath

@fouimette usually it's nothing to worry about. When actor system terminates, it kills all actors in async fashion. Actors build in hierarchies parent-child often send messages to each other when terminating. In case of system termination that means that one terminating actor could send a message to another, which is being terminated too.

Corneliu

@corneliutusnea

Hi guys, what's the status of the Akka Cluster?

Bartosz Sypytkowski

@Horusiath

@corneliutusnea pretty solid already, I think @Aaronontheweb is going to move it out of beta in a week.

Corneliu

@corneliutusnea

Should I wait for final integration / testing with my product ?

Bartosz Sypytkowski

@Horusiath

if it's only a week, I would wait anyway

qwoz

@qwoz

Thanks @to11mtm ... is there a site for Akka.Visualizer with a bit more info?

Corneliu

@corneliutusnea

@qwoz I think you are talking about my visualizer. I really had no time to publish it :/ my fault

Corneliu

@corneliutusnea

@qwoz https://github.com/corneliutusnea/Akka.Visualizer

fouimette

@fouimette

@Horusiath Thanks for the response. I would expect that a simple demo to create an actor in an actor system and then terminating the system would not produce such an unexpected result.

qwoz

@qwoz

thanks @corneliutusnea

hidavidpeng

@hidavidpeng

hi How can I get recover the message in supervisor?

Bart de Boer

@boekabart

@hidavidpeng either in the 'character' actor you do smth with it in PreRestart (or PostStop), or have the supervisor 'remember' it when sending it to the inner actor, and keep it until 'OK' or 'NOK (deadwatchnotification)'

Ricky Blankenaufulland

@ZoolWay

Can I check if a (cluster) router currently has any routees?

Ricky Blankenaufulland

@ZoolWay

In more words: I would like to know if there is currently any node connected which has actors capable of the job I want to do.

Alex Valuyskiy

@alexvaluyskiy

await router.Ask<Routees>(new GetRoutees())

to11mtm

@to11mtm

@corneliutusnea THANK YOU for putting it on git finally. =D

Stanley Goldman

@StanleyGoldman

are there any screenshots of the visualizer?

Aaron Stannard

@Aaronontheweb

man, amazing what one small change can do in the right place in terms of performance

removed one allocation inside the dispatcher system and saw a bump immediately

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