john-kurkowski

Fault Tolerance: Software is Ruining the Human Experience

Mostly a rant on a few bad experiences that could have been prevented in real life if engineers did a good job instead of a good enough job. We have no oath to "Do no harm!" So, we take license to ship whatever. This is bad for humans.

Intro: Fault Tolerance and Bad Human Experiences

Pumping Up the Tires

1. Wow look new technology, pumping up tires is way better now
2. Not so much, they added software to the process, oops

john-kurkowski

class SlidingWindowMap(keys: Set[String], maxCount: Int, periodMs: Int) {

  val times = new collection.mutable.HashMap[String, Vector[Long]]() with collection.mutable.SynchronizedMap[String, Vector[Long]]
  times ++= keys.map(k => (k, Vector[Long]()))

  def nextKey: Option[String] = {
    val now = System.currentTimeMillis
    times.synchronized {
      val trimmedTimes = times.toStream map { case (k, usage) =>
        val trimmedUsage = usage dropWhile (_ < now - periodMs)