Skip to main content

Akka.NET–Testing the exceptional flow (Continued)

Yesterday I blogged about our approach to test Exceptions thrown by your Akka.NET actors. Today I want to talk about an issue we encountered when using our own ActorSystem.

In the example yesterday we were using the Sys property of the Akka.NET Testkit which gives us access to a built-in Actor System created for us:

var actor = Sys.ActorOf(Props.Create(() => new SampleActor()));

var filter = CreateEventFilter(Sys);

However when we tried to run the same test but using our own ActorSystem instance instead the test failed and no Exception was received by the EventFilter.

To understand why this fails, you have to understand what TestKit is doing behind the scenes when creating an ActorSystem for you. For every test you run it creates a new ActorSystem instance using the following configuration:

The important line here is the following:

loggers = ["Akka.TestKit.TestEventListener, Akka.TestKit"]

This line will link the TestKit EventFilter to the ActorSystem. As we didn’t had any configuration setup for our own ActorSystem, the EventFilter didn’t pick up any event.

To fix it, we included the configuration above in our app.config:

Labels:

Popular posts from this blog

.NET 8–Keyed/Named Services

A feature that a lot of IoC container libraries support but that was missing in the default DI container provided by Microsoft is the support for Keyed or Named Services. This feature allows you to register the same type multiple times using different names, allowing you to resolve a specific instance based on the circumstances. Although there is some controversy if supporting this feature is a good idea or not, it certainly can be handy. To support this feature a new interface IKeyedServiceProvider got introduced in .NET 8 providing 2 new methods on our ServiceProvider instance: object? GetKeyedService(Type serviceType, object? serviceKey); object GetRequiredKeyedService(Type serviceType, object? serviceKey); To use it, we need to register our service using one of the new extension methods: Resolving the service can be done either through the FromKeyedServices attribute: or by injecting the IKeyedServiceProvider interface and calling the GetRequiredKeyedServic...
Read more

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...
Read more