/// <summary> /// Asserts that the NumOps and quantiles for a metric have been changed at /// some point to a non-zero value. /// </summary> /// <param name="prefix">of the metric</param> /// <param name="rb">MetricsRecordBuilder with the metric</param> public static void AssertQuantileGauges(string prefix, MetricsRecordBuilder rb) { Org.Mockito.Mockito.Verify(rb).AddGauge(EqName(Interns.Info(prefix + "NumOps", string.Empty )), AdditionalMatchers.Geq(0l)); foreach (Quantile q in MutableQuantiles.quantiles) { string nameTemplate = prefix + "%dthPercentileLatency"; int percentile = (int)(100 * q.quantile); Org.Mockito.Mockito.Verify(rb).AddGauge(EqName(Interns.Info(string.Format(nameTemplate , percentile), string.Empty)), AdditionalMatchers.Geq(0l)); } }
/// <summary> /// Ensure that quantile estimates from /// <see cref="MutableQuantiles"/> /// are within /// specified error bounds. /// </summary> /// <exception cref="System.Exception"/> public virtual void TestMutableQuantilesError() { MetricsRecordBuilder mb = MetricsAsserts.MockMetricsRecordBuilder(); MetricsRegistry registry = new MetricsRegistry("test"); // Use a 5s rollover period MutableQuantiles quantiles = registry.NewQuantiles("foo", "stat", "Ops", "Latency" , 5); // Push some values in and wait for it to publish long start = Runtime.NanoTime() / 1000000; for (long i = 1; i <= 1000; i++) { quantiles.Add(i); quantiles.Add(1001 - i); } long end = Runtime.NanoTime() / 1000000; Thread.Sleep(6000 - (end - start)); registry.Snapshot(mb, false); // Print out the snapshot IDictionary <Quantile, long> previousSnapshot = quantiles.previousSnapshot; foreach (KeyValuePair <Quantile, long> item in previousSnapshot) { System.Console.Out.WriteLine(string.Format("Quantile %.2f has value %d", item.Key .quantile, item.Value)); } // Verify the results are within our requirements Org.Mockito.Mockito.Verify(mb).AddGauge(Interns.Info("FooNumOps", "Number of ops for stat with 5s interval" ), (long)2000); Quantile[] quants = MutableQuantiles.quantiles; string name = "Foo%dthPercentileLatency"; string desc = "%d percentile latency with 5 second interval for stat"; foreach (Quantile q in quants) { int percentile = (int)(100 * q.quantile); int error = (int)(1000 * q.error); string n = string.Format(name, percentile); string d = string.Format(desc, percentile); long expected = (long)(q.quantile * 1000); Org.Mockito.Mockito.Verify(mb).AddGauge(Matchers.Eq(Interns.Info(n, d)), AdditionalMatchers.Leq (expected + error)); Org.Mockito.Mockito.Verify(mb).AddGauge(Matchers.Eq(Interns.Info(n, d)), AdditionalMatchers.Geq (expected - error)); } }