Dropwizard Metrics

DropWizardTest.scala

object DropWizardTest extends App {
  val random = Random

  val times =
    //normal behavior
    (1 to 100000).map(_ => random.nextInt(100)) ++
      //standard peacks
      (1 to 100).map(_ => 1000) ++
      //very high peacks
      (1 to 10).map(_ => 10000)

  //print histogram for the same data set
  (1 to 1).foreach(_ => printHdrHistogram(times))

  def printHistogram(times: Seq[Int]) = {
    val timer = new Timer
    times.map(time => timer.update(time, TimeUnit.NANOSECONDS))
    val snapshot = timer.getSnapshot
    println("-----------")
    printf("75: %f\n", snapshot.get75thPercentile())
    printf("95: %f\n", snapshot.get95thPercentile())
    printf("99: %f\n", snapshot.get99thPercentile())
    printf("99.9: %f\n", snapshot.get999thPercentile())
    printf("max: %d\n", snapshot.getMax)
  }
}