Communication.scala

def behavior(food : Set[Food], shopActor: ActorRef[ShopCommand]): Behavior[FoodOrdered] = //[1]
    ContextAware[FridgeCommand] { ctx ⇒
      Total {
        case FoodOrdered(replyTo, order) ⇒
          val f = food.find(_ == order)
          replyTo ! f.map(food => Eat(food)).getOrElse(Wait(ctx.self))
  
          val wrapper = ctx.spawnAdapter { //[2]
            n: NewFoodDelivered => StoreFood(n.food)
          }
          shopActor ! NewFoodOrder(wrapper, order) //[3]
          behavior(food, shopActor) //[4]
      }
    }.narrow //[5]