How to implement guide with concurrent updates in a scala akka actor - unexpected state errors
I'm having a hard time understanding I've looked through the documentation and I'm still confused about I've looked through the documentation and I'm still confused about I'm working with an Akka actor in Scala 2.13.6 that manages a mutable state... I’m experiencing unexpected state inconsistencies when multiple messages are processed concurrently. The actor is designed to handle requests that update a counter, but I keep seeing values that don't reflect the expected increments. Here’s a simplified version of my actor code: ```scala import akka.actor.Actor import akka.actor.Props class CounterActor extends Actor { private var count = 0 def receive: Receive = { case Increment => count += 1 sender() ! count case GetCount => sender() ! count } } object CounterActor { def props: Props = Props[CounterActor] } ``` Then, I have a test that sends multiple `Increment` messages in parallel: ```scala val counterActor = system.actorOf(CounterActor.props) val futures = (1 to 100).map { _ => (counterActor ? Increment).mapTo[Int] } val results = Future.sequence(futures) results.onComplete { res => println(s"Final counts: ${res.get}") } ``` Despite incrementing the counter 100 times, the results sometimes show values such as [97, 98, 99], which is incorrect. I have tried using `context.become` to update state, but it didn’t resolve the scenario. I also considered using `AtomicInteger`, but that feels like a workaround rather than a proper solution. What’s the best practice here to ensure that my actor’s state remains consistent even when processing messages concurrently? Is there a better approach? This is part of a larger web app I'm building. Has anyone else encountered this? This is part of a larger application I'm building. This is my first time working with Scala 3.9. Any pointers in the right direction?