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package kamon.metric
import kamon.Kamon
import org.scalatest.{Matchers, WordSpec}
class TimerSpec extends WordSpec with Matchers {
import TimerTestHelper._
"a Timer" should {
"record the duration between calls to .start() and .stop() in the StartedTimer" in {
val timer = Kamon.timer("timer-spec")
timer.start().stop()
timer.start().stop()
timer.start().stop()
timer.distribution().count shouldBe(3)
}
"ensure that a started timer can only be stopped once" in {
val timer = Kamon.timer("timer-spec")
val startedTimer = timer.start()
startedTimer.stop()
startedTimer.stop()
startedTimer.stop()
timer.distribution().count shouldBe(1)
}
"allow to record values and produce distributions as Histograms do" in {
val timer = Kamon.timer("test-timer")
timer.record(100)
timer.record(150, 998)
timer.record(200)
val distribution = timer.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 = timer.distribution()
emptyDistribution.min shouldBe(0)
emptyDistribution.max shouldBe(0)
emptyDistribution.count shouldBe(0)
emptyDistribution.buckets.length shouldBe 0
}
}
}
object TimerTestHelper {
implicit class HistogramMetricSyntax(histogram: Histogram) {
def distribution(resetState: Boolean = true): Distribution = histogram match {
case h: AtomicHdrHistogram => h.snapshot(resetState).distribution
case h: HdrHistogram => h.snapshot(resetState).distribution
}
}
implicit class TimerMetricSyntax(metric: TimerMetric) {
def distribution(resetState: Boolean = true): Distribution =
metric.refine(Map.empty[String, String]) match {
case t: TimerImpl => t.histogram.distribution(resetState)
}
}
}
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