Facilitates runtime dependency injection of "functional programming"-style actor behaviors.

1. Mix this trait into the object defining the actor message(s) and behavior(s); 2. Define the Message type with actor message class; 3. Annotate with Provides the "create" method that returns the (possibly just initial) Behavior of the actor; 4. Use the bindTypedActor in AkkaGuiceSupport, passing the object as the actor module.

For example:

object ConfiguredActor extends ActorModule {
  type Message = GetConfig

  final case class GetConfig(replyTo: ActorRef[String])

  @Provides def apply(configuration: Configuration): Behavior[GetConfig] = {
    // TODO: Define ConfiguredActor's behavior using the injected configuration.
    Behaviors.empty
  }
}

final class AppModule extends AbstractModule with AkkaGuiceSupport {
  override def configure() = {
    bindTypedActor(classOf[ConfiguredActor], "configured-actor")
  }
}

Message is a type member rather than a type parameter is because you can't define, using the example above, GetConfig inside the object and also have the object extend ActorModule[ConfiguredActor.GetConfig].