/// <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));
}
}
