Package io.prometheus.client

Class SimpleTimer

  • public class SimpleTimer
extends java.lang.Object
    SimpleTimer, to measure elapsed duration in seconds as a double.

    This is a helper class intended to measure latencies and encapsulate the conversion to seconds without losing precision.

    Keep in mind that preferred approaches avoid using this mechanism if possible, since latency metrics broken out by outcome should be minimized; Summary.startTimer() and Histogram.startTimer() are preferred. Consider moving outcome labels to a separate metric like a counter.

    Example usage: 

     
   class YourClass {
     static final Summary requestLatency = Summary.build()
         .name("requests_latency_seconds")
         .help("Request latency in seconds.")
         .labelNames("aLabel")
         .register();

     void processRequest(Request req) {
        SimpleTimer requestTimer = new SimpleTimer();
        try {
          // Your code here.
        } finally {
          requestLatency.labels("aLabelValue").observe(requestTimer.elapsedSeconds());
        }
     }
   }

    • Method Detail

      • elapsedSeconds

        public double elapsedSeconds()
        Returns:
        Measured duration in seconds since SimpleTimer was constructed.

      • elapsedSecondsFromNanos

        public static double elapsedSecondsFromNanos​(long startNanos,
                                             long endNanos)