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package kamon.metric.instrument
import java.util.concurrent.atomic.AtomicLong
import kamon.metric.instrument.Histogram.DynamicRange
import kamon.testkit.BaseKamonSpec
import scala.concurrent.duration._
class GaugeSpec extends BaseKamonSpec("gauge-spec") {
"a Gauge" should {
"automatically record the current value using the configured refresh-interval" in new GaugeFixture {
val (numberOfValuesRecorded, gauge) = createGauge()
Thread.sleep(1.second.toMillis)
numberOfValuesRecorded.get() should be(10L +- 1L)
gauge.cleanup
}
"stop automatically recording after a call to cleanup" in new GaugeFixture {
val (numberOfValuesRecorded, gauge) = createGauge()
Thread.sleep(1.second.toMillis)
gauge.cleanup
numberOfValuesRecorded.get() should be(10L +- 1L)
Thread.sleep(1.second.toMillis)
numberOfValuesRecorded.get() should be(10L +- 1L)
}
"produce a Histogram snapshot including all the recorded values" in new GaugeFixture {
val (numberOfValuesRecorded, gauge) = createGauge()
Thread.sleep(1.second.toMillis)
gauge.cleanup
val snapshot = gauge.collect(kamon.metrics.buildDefaultCollectionContext)
snapshot.numberOfMeasurements should be(10L +- 1L)
snapshot.min should be(1)
snapshot.max should be(10L +- 1L)
}
"not record the current value when doing a collection" in new GaugeFixture {
val (numberOfValuesRecorded, gauge) = createGauge(10 seconds)
val snapshot = gauge.collect(kamon.metrics.buildDefaultCollectionContext)
snapshot.numberOfMeasurements should be(0)
numberOfValuesRecorded.get() should be(0)
}
}
trait GaugeFixture {
def createGauge(refreshInterval: FiniteDuration = 100 millis): (AtomicLong, Gauge) = {
val recordedValuesCounter = new AtomicLong(0)
val gauge = Gauge(DynamicRange(1, 100, 2), refreshInterval, kamon.metrics.settings.refreshScheduler, {
() ⇒ recordedValuesCounter.addAndGet(1)
})
(recordedValuesCounter, gauge)
}
}
}
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