lazy loading some config params, trying to come up with a pattern in Scala

val config:Config = new MyConfig("c:/etc/myConfig.txt")
    println(config.param1)
    println(config.param2)
    println(config.param3)

trait Config {
  lazy val param1:String = resolveParam1
  lazy val param2:String = resolveParam2
  lazy val param3:Int = resolveParam3

  protected def resolveParam1:String
  protected def resolveParam2:String
  protected def resolveParam3:Int
}

class MyConfig(fileName:String) extends Config {
  lazy val data:Map[String, Any] = readConfig

  // some dummy impl here, should read from a file
  protected def readConfig:Map[String,Any] = Map[String, Any]("p1" -> "abc", "p2" -> "defgh", "p3" -> 43)

  protected def resolveParam1:String = data.get("p1").get.asInstanceOf[String]
  protected def resolveParam2:String = data.get("p2").get.asInstanceOf[String]
  protected def resolveParam3:Int = data.get("p3").get.asInstanceOf[Int]
}

trait Config {
  val param1: String
  val param2: String
  val param3: Int
}

class MyConfig extends Config {
  lazy val param1 = readConfig().("p1")
  ...

  def readConfig(): Map[String, String] = ...
}

trait Config {
  def param1:String
  def param2:String
  def param3:Int
}

class MyConfig(fileName:String) extends Config {
  lazy val data:Map[String, Any] = readConfig

  // some dummy impl here, should read from a file
  protected def readConfig:Map[String,Any] =
    Map[String, Any]("p1" -> "abc", "p2" -> "defgh", "p3" -> 43)

  def param1:String = data.get("p1").get.asInstanceOf[String]
  def param2:String = data.get("p2").get.asInstanceOf[String]
  def param3:Int = data.get("p3").get.asInstanceOf[Int]
}

class MyConfig(fileName:String) extends Config {
  private class NonLazyConfig(val p1:String, p2:String, p3:int) extends Config {
      def param1 = p1
      def param2 = p2
      def param1 = p3
  }
  lazy val inner:Config = readConfig

  // some dummy impl here, should read from a file
  protected def readConfig:Config = {
    return new NonLazyConfig("abc", "defgh", 43)
  }
  def param1:String = inner.param1
  def param2:String = inner.param2
  def param3:Int = inner.param3
}