/**
   * Runs a function. If the function throws an exception, sleep and try the function again.
   * @param retries The number of times to attempt to call the function
   * @param retryDelayMS The delay (in milliseconds) between attempts to execute the function
   * @param retryLogFn A function that is called when the function fails and will be tried again. Intended to
   *                   be used to print a meaningful message to the log. Takes as an argument the number of retries
   *                   remaining.
   * @param f The function to be executed
   * @tparam T The return type of the function to be executed
   * @return The return value of f()
   */
  @tailrec
  def runNowWithRetries[T](retries: Int, retryDelayMS: Long, retryLogFn: (Int) => Unit)(f: () => T,retryable:(Throwable) => Boolean = (t:Throwable) => true): T = {
    (try {
      Some(f())
    } catch {
      case t: Throwable if retryable(t) =>
        if (retries <= 0)
          throw t
        else None
    }) match {
      case Some(x) => x
      case None =>
        retryLogFn(retries)
        delayAndReturn(retryDelayMS)(() => {})
        runNowWithRetries(retries - 1, retryDelayMS, retryLogFn)(f)
    }
  }