gistfile1.scala

trait FindTaskContext {
  def order:String
  def page:Int
  def limit:Int
}

class TaskController {
  def findTask(code:String, name:String, order:String, limit:Int, page:Int): List[Task] = {
    // 実際はDBの接続先情報とかも必要なのでもっと複雑になると思う
    object Context extends FindTaskContext {
      val order = order
      val page = page
      val limit = limit
    }
 
    TaskService.findTask(code, name, Context)
  }
}

object TaskService {
  val taskRepository = new TaskRepository() // 実際はDIされる

  def findTask(code:String, name:String, ctx:FindTaskContext):List[Task] = {
    taskRepository.findCodeAndName(code, name, ctx)
  }
}

class TaskRepository {
  def findCodeAndName(code:String, name:String, ctx:FindTaskContext):List[Task] = {
    ...
  }
}