scala-ioc.scala

trait GreeterComponent {    
    trait Greeter {
        def sayHello(who: String): String
    }
    
    def greeter: Greeter
}

trait MyGreeterComponent extends GreeterComponent {
    class AussieGreeter extends Greeter {
        def sayHello(who: String) = "G'day " + who + "!"
    }
}

trait MyAppComponent {
    
    this: GreeterComponent =>
    
    def work {
        val g = this.greeter
        println(g.sayHello("Julien"))
    }
    
}

object App extends Application with MyAppComponent with MyGreeterComponent {
    def greeter: Greeter = new AussieGreeter()
}

App.work