repositorImpl.scala

class BigFailRepository extends Repository[String] {
  override def withConnection(f: (Connection => Option[String])): Option[String] = {
    throw new UnsupportedOperationException("BAM")
  }
}

class SmallFailRepository extends Repository[String] {
  var numFails = 0

  override def withConnection(f: (Connection => Option[String])): Option[String] = {
    if (numFails < 2) {
      numFails = numFails + 1
      throw new UnsupportedOperationException("BAM")
    }
    f(null) // left out transaction mngnt to keep stuff simple
  }
}

class NoFailRepository extends Repository[String] {
  override def withConnection(f: (Connection => Option[String])): Option[String] = {
    f(null) // left out transaction mngnt to keep stuff simple
  }
}