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package kamon.metric
import akka.testkit.ImplicitSender
import com.typesafe.config.ConfigFactory
import kamon.testkit.BaseKamonSpec
import kamon.trace.TraceContext
import kamon.metric.instrument.Histogram
class TraceMetricsSpec extends BaseKamonSpec("trace-metrics-spec") with ImplicitSender {
import TraceMetricsSpec.SegmentSyntax
override lazy val config =
ConfigFactory.parseString(
"""
|kamon.metric {
| tick-interval = 1 hour
| default-collection-context-buffer-size = 10
|
| filters {
| trace {
| includes = [ "*" ]
| excludes = [ "non-tracked-trace"]
| }
| }
|}
""".stripMargin)
"the TraceMetrics" should {
"record the elapsed time between a trace creation and finish" in {
for (repetitions ← 1 to 10) {
TraceContext.withContext(newContext("record-elapsed-time")) {
TraceContext.currentContext.finish()
}
}
val snapshot = takeSnapshotOf("record-elapsed-time", "trace")
snapshot.histogram("elapsed-time").get.numberOfMeasurements should be(10)
}
"record the elapsed time for segments that occur inside a given trace" in {
TraceContext.withContext(newContext("trace-with-segments")) {
val segment = TraceContext.currentContext.startSegment("test-segment", "test-category", "test-library")
segment.finish()
TraceContext.currentContext.finish()
}
val snapshot = takeSnapshotOf("trace-with-segments", "trace")
snapshot.histogram("elapsed-time").get.numberOfMeasurements should be(1)
snapshot.segments.size should be(1)
snapshot.segment("test-segment", "test-category", "test-library").numberOfMeasurements should be(1)
}
"record the elapsed time for segments that finish after their correspondent trace has finished" in {
val segment = TraceContext.withContext(newContext("closing-segment-after-trace")) {
val s = TraceContext.currentContext.startSegment("test-segment", "test-category", "test-library")
TraceContext.currentContext.finish()
s
}
val beforeFinishSegmentSnapshot = takeSnapshotOf("closing-segment-after-trace", "trace")
beforeFinishSegmentSnapshot.histogram("elapsed-time").get.numberOfMeasurements should be(1)
beforeFinishSegmentSnapshot.segments.size should be(0)
segment.finish()
val afterFinishSegmentSnapshot = takeSnapshotOf("closing-segment-after-trace", "trace")
afterFinishSegmentSnapshot.histogram("elapsed-time").get.numberOfMeasurements should be(0)
afterFinishSegmentSnapshot.segments.size should be(1)
afterFinishSegmentSnapshot.segment("test-segment", "test-category", "test-library").numberOfMeasurements should be(1)
}
}
}
object TraceMetricsSpec {
implicit class SegmentSyntax(val entitySnapshot: EntitySnapshot) extends AnyVal {
def segments: Map[HistogramKey, Histogram.Snapshot] = {
entitySnapshot.histograms.filterKeys(_.metadata.contains("category"))
}
def segment(name: String, category: String, library: String): Histogram.Snapshot =
segments(TraceMetrics.segmentKey(name, category, library))
}
}
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