From 4a918ce6570129d3d4fd2d3e98d43f8078bb2d99 Mon Sep 17 00:00:00 2001
From: Eugene Platonov <jozic@live.com>
Date: Tue, 1 Dec 2015 13:26:50 -0500
Subject: + core: provide generic way to scale time and memory metrics

---
 .../kamon/metric/MetricScaleDecoratorSpec.scala    | 100 +++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 kamon-core/src/test/scala/kamon/metric/MetricScaleDecoratorSpec.scala

(limited to 'kamon-core/src/test/scala/kamon/metric/MetricScaleDecoratorSpec.scala')

diff --git a/kamon-core/src/test/scala/kamon/metric/MetricScaleDecoratorSpec.scala b/kamon-core/src/test/scala/kamon/metric/MetricScaleDecoratorSpec.scala
new file mode 100644
index 00000000..04821923
--- /dev/null
+++ b/kamon-core/src/test/scala/kamon/metric/MetricScaleDecoratorSpec.scala
@@ -0,0 +1,100 @@
+/*
+ * =========================================================================================
+ * Copyright © 2013-2015 the kamon project <http://kamon.io/>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language governing permissions
+ * and limitations under the License.
+ * =========================================================================================
+ */
+
+package kamon.metric
+
+import kamon.Kamon
+import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
+import kamon.metric.instrument.{InstrumentFactory, Memory, Time, UnitOfMeasurement}
+import kamon.testkit.BaseKamonSpec
+import kamon.util.MilliTimestamp
+import org.scalatest.OptionValues._
+
+class MetricScaleDecoratorSpec extends BaseKamonSpec("metrics-scale-decorator-spec") with SnapshotFixtures {
+  "the MetricScaleDecorator" when {
+    "receives a snapshot" which {
+
+      val scaleDecorator = system.actorOf(MetricScaleDecorator.props(
+        Some(Time.Milliseconds), Some(Memory.KiloBytes), testActor))
+      "is empty" should {
+        "do nothing for empty snapshots" in {
+          scaleDecorator ! emptySnapshot
+          expectMsg(emptySnapshot)
+        }
+      }
+      "is non empty" should {
+        scaleDecorator ! nonEmptySnapshot
+        val scaled = expectMsgType[TickMetricSnapshot]
+        val snapshot = scaled.metrics(testEntity)
+
+        "scale time metrics" in {
+          snapshot.histogram("nano-time").value.max should be(10L +- 1L)
+          snapshot.counter("micro-time").value.count should be(1000L)
+        }
+        "scale memory metrics" in {
+          snapshot.histogram("byte-memory").value.max should be(1)
+          snapshot.counter("kbyte-memory").value.count should be(100L)
+        }
+        "do nothing with unknown metrics" in {
+          snapshot.histogram("unknown-histogram").value.max should be(1000L)
+          snapshot.counter("unknown-counter").value.count should be(10L)
+        }
+        "not change from and to" in {
+          scaled.from.millis should be(1000)
+          scaled.to.millis should be(2000)
+        }
+      }
+    }
+  }
+}
+
+trait SnapshotFixtures {
+  self: BaseKamonSpec =>
+
+  class ScaleDecoratorTestMetrics(instrumentFactory: InstrumentFactory)
+    extends GenericEntityRecorder(instrumentFactory) {
+    val nanoTime = histogram("nano-time", Time.Nanoseconds)
+    val microTime = counter("micro-time", Time.Microseconds)
+    val byteMemory = histogram("byte-memory", Memory.Bytes)
+    val kbyteMemory = counter("kbyte-memory", Memory.KiloBytes)
+    val unknownHistogram = histogram("unknown-histogram", UnitOfMeasurement.Unknown)
+    val unknownCounter = counter("unknown-counter", UnitOfMeasurement.Unknown)
+  }
+
+  object ScaleDecoratorTestMetrics extends EntityRecorderFactory[ScaleDecoratorTestMetrics] {
+    override def category: String = "decorator-spec"
+
+    override def createRecorder(instrumentFactory: InstrumentFactory): ScaleDecoratorTestMetrics =
+      new ScaleDecoratorTestMetrics(instrumentFactory)
+  }
+
+  val testEntity = Entity("metrics-scale-decorator-spec", "decorator-spec")
+  val recorder = Kamon.metrics.entity(ScaleDecoratorTestMetrics, "metrics-scale-decorator-spec")
+
+  val emptySnapshot = TickMetricSnapshot(new MilliTimestamp(1000), new MilliTimestamp(2000), Map.empty)
+
+  recorder.unknownCounter.increment(10)
+  recorder.unknownHistogram.record(1000L)
+  recorder.nanoTime.record(10000000L)
+  recorder.microTime.increment(1000000L)
+  recorder.byteMemory.record(1024L)
+  recorder.kbyteMemory.increment(100L)
+
+  val nonEmptySnapshot = TickMetricSnapshot(new MilliTimestamp(1000), new MilliTimestamp(2000), Map(
+    (testEntity -> recorder.collect(collectionContext))))
+
+}
+
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