how could I get instance of play's actor system in my custom application loader?

[ma...@knoldus.com]

In Play 2.6, the default playframework application has an AsyncController. Ir needs the ActorSystem.

class AsyncController @Inject()(cc: ControllerComponents, actorSystem: ActorSystem)(implicit exec: ExecutionContext) extends AbstractController(cc) {

I am creating a code which needs compile time dependency injection. I suppose I have to create instance of all the controllers of my application and and pass it to Routes

lazy val router = new Routes(httpErrorHandler, homeController,userWSRoutes, countController,asyncController, assets)

My issue is that I dont know what to pass as ActorSystem while creating the instance of AsyncController.

lazy val asyncController = new controllers.AsyncController(controllerComponents, system) //what should be system.

I tried injecting (and also tried implicit) arguments but it didn't work. I could however create a new actor system and pass it to the controller but I dont want this. I want to get instance of the actor system which play creates by default ( I suppose it is called application)

lazy val asyncController = new controllers.AsyncController(controllerComponents, ActorSystem.create("CJ")) //this works but I am creating my own actor system. I need play's default system

[Greg Methvin]

Usually if you use compile-time DI with play you will extend BuiltInComponentsFromContext. BuiltinComponents provides a lazy val actorSystem, which is the ActorSystem the application uses.

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[Miguel Ángel Moreno]

Hello

As Greg says, you have to mix BuiltInComponentsFromContext. In a project I am doing, I have something like the following code (using compile-time DI with macwire in my case)

class AppApplicationLoader extends ApplicationLoader {

  override def load(context: ApplicationLoader.Context): PlayApplication = {

    LoggerConfigurator(context.environment.classLoader).foreach { cfg =>

      cfg.configure(context.environment)

    }

    new AppComponents(context).application

  }

}

class AppComponents(context: Context) extends BuiltInComponentsFromContext(context) with MoreTraitsHere {

.... more stuff ...

  // Actors

  lazy val myActor: ActorRef = actorSystem.actorOf(MyActor.props(), MyActor.name)

  .... more stuff ...

}

inside application.conf

play.application.loader = "AppApplicationLoader"

As you can see, you just mix that trait and the actor system is available for you. Use it wisely, a great power comes with a great responsibility ;)

Miguel