Akka.net masstransit how to#
Akka.net masstransit code#
Akka.net masstransit windows#

Grains are exchanging massages between each other. But this is an edge-case which falls into error handling strategies, overall assumption is that each grain is activated only once. This problem is in general called a split-brain in computing. There can be some exceptions from that rule: when node crashes framework may be not sure when exactly grain has finished its processing.

Framework can place grains in all nodes across the cluster, so that each grain is located only in a single node. Orleans can run in cluster using many servers. As programmer you can invoke saving to storage any time when state has changed. State can be persisted to database to avoid loosing data on system restarts. It gives big performance benefits compared to creating entity instance based on data from database for each request. It means that they live in memory between requests to system. A constraint that we have is that all methods have to be asynchronous to keep all the communication between grains non-blocking. In practice Grains are implemented like normal C# classes. It can be instance of a Player, Trader, Customer or Account depending on domain topic. Actor or Grain is a class representing some business entity. ItвЂ™s an alternative to Akka.NET offering similar actor-based architecture.ДЄctors are called Grains in Orleans.

ThatвЂ™s a recipe for a bad time.IвЂ™ve spent some time recently playing around with Orleans Framework. The alternative - not cleanly shutting down the ASP.NET IHost when the ActorSystem terminates, results in an ISignalRProcessor instance that is still being actively called by SignalR or ASP.NET but canвЂ™t actually do itвЂ™s job because the actors responsible for doing the processing are now dead.

Akka.net masstransit windows#

In this instance itвЂ™s important for us to ensure that the entire IHost responsible for running in the process foreground is terminated so the process can cleanly exit - this allows process supervision platforms such as Windows Services and Kubernetes to restart a process that exited unexpectedly. One other small wrinkle that many production Akka.NET users initially run into is a scenario, typically when using Akka.Cluster, where the ActorSystem may be terminated programmatically - such as when itвЂ™s kicked out of the cluster by one of the other nodes. Cleanly Terminating ASP.NET Upon ActorSystem Termination

ActorOf ( signalRProps, 'signalr' ) ДЄnd from there, the actor can safely communicate with the CrawlHub over an indefinite period of time. Props ( processor ) _signalRActor = _clusterSystem. The CrawlHubHelper will be passed to the SignalRActor using the (which we wrote about here): / /// that runs and manages in background /// public sealed class AkkaService : IHostedService, ISignalRProcessor

Akka.net masstransit code#

Using our popular Cluster.WebCrawler code sample as a reference - it uses SignalR to communicate between the end-user and the ActorSystem via the CrawlHub: However, what happens when something inside our ASP.NET application takes a dependency on one of our actors? How do we connect those two components together? Exposing IActorRefs to ASP.NET and SignalRДЄs a best practice we typically host our ActorSystem inside an IHostedService running in the background of our ASP.NET application - that way we can take advantage of and some of the lifecycle hooks easily.

Akka.net masstransit how to#

WeвЂ™ll show you how to handle both of those in this post.

When your ActorSystem is terminated, we must also guarantee that the IWebHost shuts down - otherwise we end up with a zombie application.

When working with ASP.NET and Signalr, you often need to expose at least one of your IActorRefs to a controller or a SignalR hub and.

So the ideal formula for running Akka.NET inside ASP.NET Core is to follow the directions from our blog post about running Akka.NET services using IHostedService, but with a couple of twists: NOTE: Also, please check out our dotnet new template to use these patterns straight away inside your own applications! Running Akka.NET inside ASP.NET Core This blog post accompanies that video and expands on some of the advice we give in it! So, we went ahead and put together a video: вЂњ Best Practices for Integrating Akka.NET and ASP.NET CoreвЂќ which demonstrates how to work with Akka.NET and ASP.NET Core inside a single process.

NET Framework 4.5 - so weвЂ™re due for an update. In the recent past we blogged about hosting headless Akka.NET services using IHostedService and we thought weвЂ™d extend that train of thought to cover ASP.NET Core.NETвЂ™s web ecosystem has changed a lot since 2015, when we last wrote about hosting Akka.NET with ASP.NET MVC and even NancyFX on.