This is a port of Akka's excellent implementation of the PhiAccuralFailureDetector as proposed by Hayashibara et al.

Usage

fd, err := failuredetector.New(
		8.0,
		200,
		500*time.Millisecond,
		0,
		500*time.Millisecond,
		nil)

if err != nil {
  // invalid arguments given (e.g. negative sample size)
  panic(err)
}

go func() {
  for {
    time.Sleep(1 * time.Second) // some expensive check
    fd.Heartbeat()
  }
}()

// health check
fmt.Println(fd.IsAvailable())