Cake pattern for Spring-flavored DAOs

gistfile1.scala

import java.net.URI

trait Order
trait Product
trait Datasource

trait DAO[T] {
  def create(t:T)
}

trait JdbcSupport {
  val dataSource:Datasource
  def init(uri:URI, user:String, password:String) = Unit
}

trait OrderDAO {self: JdbcSupport =>

  val orderDao: DAO[Order]

  class OrderDAOImpl extends DAO[Order]{
    //...
    def create(t:Order) = {
      dataSource//...
    }
  }

}

trait ProductDAO {self: JdbcSupport =>

  val productDao: DAO[Product]

  class ProductDAOImpl extends DAO[Product]{
    //...
    def create(t:Product) = {
      dataSource//...
    }
  }

}

object DAOLayer extends OrderDAO with ProductDAO with JdbcSupport {
  val dataSource = new Datasource{}
  //init(uri, user, password)

  val productDao = new ProductDAOImpl
  val orderDao = new OrderDAOImpl
}

class ProductService {
  import DAOLayer._

  def createProduct(product: Product) = productDao.create(product)
}