ScaleFactor.scala

object ScaleFactor {

  val T1MicroSpeed = 10.0

  def calcNeedInstances(avgSpeed: Int, queueSize: Int): Int = {
    val taskPerHour  = avgSpeed * 3600
    val maxInstances = math.ceil(avgSpeed / T1MicroSpeed)

    queueSize / taskPerHour.toDouble match {
      case h if h < 1 ⇒ math.ceil(maxInstances * h).toInt
      case _ ⇒ maxInstances.toInt
    }
  }
}