raboof

  def addItem(newItem: BasketItem): BasketState = {
    copy(
      items.foldRight((false, List.empty[BasketItem])) {
        case (item, (_, out)) if (item.matchesProductAndSizeOf(newItem)) ⇒ (true, item.incrementNumberBy(newItem.numberOfProducts) :: out)
        case (item, (didSomethingMatch, out))                            ⇒ (didSomethingMatch, item :: out)
      } match {
        case (false, _)            ⇒ newItem :: items
        case (true, modifiedItems) ⇒ modifiedItems
      }
    )

raboof

package playground

import scala.concurrent.duration._
import scala.concurrent.{ExecutionContext, Future}
import scala.util.{Failure, Success, Try}

import akka.actor.{Actor, ActorLogging, ActorRef, Props}
import akka.util.Timeout
import akka.pattern.{ask, pipe}
import playground.Parent.{BulkTasks, Finish, TaskCompleted, TaskFailed}