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package kamon.metric.instrument
import java.util.concurrent.atomic.AtomicLong
import akka.actor.ActorSystem
import com.typesafe.config.ConfigFactory
import kamon.metric.{ Scale, CollectionContext }
import org.scalatest.{ Matchers, WordSpecLike }
import scala.concurrent.duration._
class GaugeSpec extends WordSpecLike with Matchers {
val system = ActorSystem("gauge-spec", ConfigFactory.parseString(
"""
|kamon.metrics {
| flush-interval = 1 hour
| precision {
| default-gauge-precision {
| refresh-interval = 100 milliseconds
| highest-trackable-value = 999999999
| significant-value-digits = 2
| }
| }
|}
""".stripMargin))
"a Gauge" should {
"automatically record the current value using the configured refresh-interval" in {
val numberOfValuesRecorded = new AtomicLong(0)
val gauge = Gauge.fromDefaultConfig(system) { () ⇒ numberOfValuesRecorded.addAndGet(1) }
Thread.sleep(1.second.toMillis)
numberOfValuesRecorded.get() should be(10L +- 1L)
gauge.cleanup
}
"stop automatically recording after a call to cleanup" in {
val numberOfValuesRecorded = new AtomicLong(0)
val gauge = Gauge.fromDefaultConfig(system) { () ⇒ numberOfValuesRecorded.addAndGet(1) }
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 {
val numberOfValuesRecorded = new AtomicLong(0)
val gauge = Gauge.fromDefaultConfig(system) { () ⇒ numberOfValuesRecorded.addAndGet(1) }
Thread.sleep(1.second.toMillis)
gauge.cleanup
val snapshot = gauge.collect(CollectionContext.default)
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 {
val numberOfValuesRecorded = new AtomicLong(0)
val gauge = Gauge(Histogram.Precision.Normal, 10000L, Scale.Unit, 1 hour, system)(() ⇒ numberOfValuesRecorded.addAndGet(1))
val snapshot = gauge.collect(CollectionContext.default)
snapshot.numberOfMeasurements should be(0)
numberOfValuesRecorded.get() should be(0)
}
}
}
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