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package kamon.metric
import kamon.Kamon
import org.scalatest.{Matchers, WordSpec}
import kamon.util.MeasurementUnit._
class HistogramSpec extends WordSpec with Matchers {
import HistogramTestHelper.HistogramMetricSyntax
"a Histogram" should {
"record values and reset internal state when a snapshot is taken" in {
val histogram = Kamon.histogram("test", unit = time.nanoseconds)
histogram.record(100)
histogram.record(150, 998)
histogram.record(200)
val distribution = histogram.distribution()
distribution.min shouldBe(100)
distribution.max shouldBe(200)
distribution.count shouldBe(1000)
distribution.buckets.length shouldBe 3
distribution.buckets.map(b => (b.value, b.frequency)) should contain.allOf(
(100 -> 1),
(150 -> 998),
(200 -> 1)
)
val emptyDistribution = histogram.distribution()
emptyDistribution.min shouldBe(0)
emptyDistribution.max shouldBe(0)
emptyDistribution.count shouldBe(0)
emptyDistribution.buckets.length shouldBe 0
}
"[private api] record values and optionally keep the internal state when a snapshot is taken" in {
val histogram = Kamon.histogram("test", unit = time.nanoseconds)
histogram.record(100)
histogram.record(150, 998)
histogram.record(200)
val distribution = {
histogram.distribution(resetState = false) // first one gets discarded
histogram.distribution(resetState = false)
}
distribution.min shouldBe(100)
distribution.max shouldBe(200)
distribution.count shouldBe(1000)
distribution.buckets.length shouldBe 3
distribution.buckets.map(b => (b.value, b.frequency)) should contain.allOf(
(100 -> 1),
(150 -> 998),
(200 -> 1)
)
}
}
}
object HistogramTestHelper {
implicit class HistogramMetricSyntax(metric: HistogramMetric) {
def distribution(resetState: Boolean = true): Distribution =
metric.refine(Map.empty[String, String]) match {
case h: AtomicHdrHistogram => h.snapshot(resetState).distribution
case h: HdrHistogram => h.snapshot(resetState).distribution
}
}
}
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