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55 lines
1.5 KiB
55 lines
1.5 KiB
package wow.doge.mygame.events
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import akka.actor.typed.ActorRef
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import akka.actor.typed.Behavior
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import akka.actor.typed.scaladsl.Behaviors
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import scala.reflect.ClassTag
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import akka.event.EventStream
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/**
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* A (typed) event bus
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* Copied (and repurposed) from Akka's EventStream
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*/
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object EventBus {
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sealed trait Command[A]
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final case class Publish[A, E <: A](
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event: E,
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publisherName: String
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) extends Command[A]
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final case class Subscribe[A, E <: A](subscriber: ActorRef[E])(implicit
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classTag: ClassTag[E]
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) extends Command[A] {
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def topic: Class[_] = classTag.runtimeClass
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}
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final case class Unsubscribe[A, E <: A](subscriber: ActorRef[E])
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extends Command[A]
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def apply[A](): Behavior[EventBus.Command[A]] =
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Behaviors.setup { ctx =>
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val eventStream = new EventStream(ctx.system.classicSystem)
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new EventBus().eventStreamBehavior(eventStream)
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}
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}
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class EventBus[B] {
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import akka.actor.typed.scaladsl.adapter._
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private def eventStreamBehavior(
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eventStream: akka.event.EventStream
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): Behavior[EventBus.Command[B]] =
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Behaviors.receiveMessage {
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case EventBus.Publish(event, name) =>
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eventStream.publish(event)
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Behaviors.same
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case s @ EventBus.Subscribe(subscriber) =>
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eventStream.subscribe(subscriber.toClassic, s.topic)
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Behaviors.same
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case EventBus.Unsubscribe(subscriber) =>
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eventStream.unsubscribe(subscriber.toClassic)
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Behaviors.same
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}
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}
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