akkadotnet/akka.net

Port of Akka actors for .NET

Stijn Herreman

@stijnherreman

the ExpectNoMsg call will block until the timeout (default or via argument) is reached and then continue, asserting you didn't receive a message

of course if your actor replies 5 minutes later with a message, the test won't catch it, but hopefully that doesn't occur :)

nathvi

@nathvi

Well, this is all on my local machine, so it should be fine :)

nathvi

@nathvi

Here's my final test that works as expected

[Fact]
        public void RequestUpdateStateSentMultipleTimes_OnlyOneResponseBack()
        {
            var probe = CreateTestProbe();
            IActorRef putwallActor = Sys.ActorOf(PutwallActor.Props());
            var guidId = Guid.NewGuid();
            putwallActor.Tell(new PutwallActor.CubbyMessage.RequestUpdateState(true, guidId), probe.Ref);
            var cubbyStateResponse = probe.ExpectMsg<PutwallActor.CubbyMessage.RequestUpdateState.Response>();
            Assert.Equal(guidId, cubbyStateResponse.MessageId);

            for (int i = 0; i < 200; i++)
            {
                putwallActor.Tell(new PutwallActor.CubbyMessage.RequestUpdateState(true, guidId), probe.Ref);
                probe.ExpectNoMsg(TimeSpan.FromMilliseconds(1));
            }
        }

Stijn Herreman

@stijnherreman

I'd put the ExpectNoMsg outside of the loop with a longer timeout, and personally (in my own tests) I just send a second message instead of hundreds, to verify that it only responds to the first message. But other than that your code seems fine.

nathvi

@nathvi

Why the longer timeout?

nathvi

@nathvi

@stijnherreman

C. Augusto Proiete

@augustoproiete

Hello everyone. Looking for some pointers on the right way to do the following with Akka:

Actor A needs to send a message to Actor B, however, they can’t see each other, and the only communication channel between these two actors is an Azure Blobstore that they both can read/write.

Should I be looking at implementing a custom mailbox? Custom transport? Or something else? Any recommendations welcome.

Aaron Stannard

@Aaronontheweb

@caioproiete .... why is the azure blob store the only thing they can use to communicate with each other?

and these actors are running on different processes I take it?

C. Augusto Proiete

@augustoproiete

@Aaronontheweb These are remote actors that run in completely separate networks and they cannot see each other due to firewalls, etc. But they can go to a specific place (e.g. Blobstore) where they can both read/write and exchange messages

I could easily serialize my some messages and make it work, but I’d prefer to use the Akka infrastructure

C. Augusto Proiete

@augustoproiete

For example, what is the recommended way to use RabbitMQ, ZeroMQ, etc. with Akka, so that it becomes the channel where Akka messages go through?

I basically want that, but replacing the channel with something else that will take care of persisting the message to/from Azure Blobstore (or whatever the shared place is)

Stijn Herreman

@stijnherreman

@nathvi because your actor could still be busy, 1ms isn't that long. 1 second gives you better assurance that the actor doesn't send out a message.

Paul Trandem

@ptrandem

Does anyone know if there's a way to get the CurrentMessage in PostStop() ?

Aaron Stannard

@Aaronontheweb

@ptrandem technically there isn't a CurrentMessage in that state since it occurs after the actor has begun terminating

it'd be the system message that triggers the actor to run its PostStop sequence

that would be the current message there

are you trying to get access to whatever is inside the mailbox?

for recovery / replay purposes?

Paul Trandem

@ptrandem

I'm trying to put together a pattern that responds with the original problem message after a certain # of supervisor-initiated restarts.

I'd like to respond to the parent with the original sender and message

Aaron Stannard

@Aaronontheweb

ah, I see

Paul Trandem

@ptrandem

once the superviser has issued a stop

Aaron Stannard

@Aaronontheweb

let me look real quick

might be a method on the ActorCell

Paul Trandem

@ptrandem

In debugging in my little test, I have a breakpoint in PostStop() and the CurrentMessage on Context is a reference to my own TestMessage, so that's why I assumed that's what I'd need.

Aaron Stannard

@Aaronontheweb

https://github.com/akkadotnet/akka.net/blob/3f924fda8d6ca55c5af90a710d23be8ce36d5c7a/src/core/Akka/Actor/ActorCell.DefaultMessages.cs#L87

so this is a little hacky IMHO

but

if your actor throws

and gets stopped

CurrentMessage is still the original message that caused the throw

because CurrentMessage = null never gets to run

exception disrupted it

so looks like it should still be preserved

if you just use that property

Paul Trandem

@ptrandem

Using that property would be great, but it's not exposed via IActorContext; i can only see it in the debugger.

I'll take a look at ActorCell as well.

Aaron Stannard

@Aaronontheweb

if you do IActorContext.AsInstanceOf<ActorCell>

that would do it\

it's assignable to that type

like I said, hacky

but it should work

Paul Trandem

@ptrandem

aah! ok. Hacky, yes, but we'll give that a shot. Thanks @Aaronontheweb !

Arsene Tochemey Gandote

@Tochemey

Hello I am having challenges create actors with Netcore where the actors need an injection of a repository at startup.

At any time I got System.ObjectDisposedException in the actor when accessing the repository interface

Bartosz Sypytkowski

@Horusiath

@Tochemey how and when are you creating your actors? Example: If you create an actor in some managed other context (i.e. http request handler) using that context's lifecycle to inject repository, it's quite probable that this repository will be disposed, while actor still lives - as actor context may live longer that context of http request.

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