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Diffstat (limited to 'kamon-core/src/legacy-test/scala/kamon/metric/instrument/MinMaxCounterSpec.scala')
| -rw-r--r-- | kamon-core/src/legacy-test/scala/kamon/metric/instrument/MinMaxCounterSpec.scala | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/kamon-core/src/legacy-test/scala/kamon/metric/instrument/MinMaxCounterSpec.scala b/kamon-core/src/legacy-test/scala/kamon/metric/instrument/MinMaxCounterSpec.scala new file mode 100644 index 00000000..d007d4cd --- /dev/null +++ b/kamon-core/src/legacy-test/scala/kamon/metric/instrument/MinMaxCounterSpec.scala @@ -0,0 +1,140 @@ +/* ========================================================================================= + * Copyright © 2013-2014 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.instrument + +import java.nio.LongBuffer + +import akka.actor._ +import akka.testkit.TestProbe +import kamon.Kamon +import kamon.metric.instrument.Histogram.{DynamicRange, MutableRecord} +import kamon.testkit.BaseKamonSpec +import scala.concurrent.duration._ + +class MinMaxCounterSpec extends BaseKamonSpec("min-max-counter-spec") { + + "the MinMaxCounter" should { + "track ascending tendencies" in new MinMaxCounterFixture { + mmCounter.increment() + mmCounter.increment(3) + mmCounter.increment() + + val snapshot = collectCounterSnapshot() + + snapshot.min should be(0) + snapshot.max should be(5) + snapshot.recordsIterator.toStream should contain allOf ( + MutableRecord(0, 1), // min + MutableRecord(5, 2) + ) // max and current + } + + "track descending tendencies" in new MinMaxCounterFixture { + mmCounter.increment(5) + mmCounter.decrement() + mmCounter.decrement(3) + mmCounter.decrement() + + val snapshot = collectCounterSnapshot() + + snapshot.min should be(0) + snapshot.max should be(5) + snapshot.recordsIterator.toStream should contain allOf ( + MutableRecord(0, 2), // min and current + MutableRecord(5, 1) + ) // max + } + + "reset the min and max to the current value after taking a snapshot" in new MinMaxCounterFixture { + mmCounter.increment(5) + mmCounter.decrement(3) + + val firstSnapshot = collectCounterSnapshot() + + firstSnapshot.min should be(0) + firstSnapshot.max should be(5) + firstSnapshot.recordsIterator.toStream should contain allOf ( + MutableRecord(0, 1), // min + MutableRecord(2, 1), // current + MutableRecord(5, 1) + ) // max + + val secondSnapshot = collectCounterSnapshot() + + secondSnapshot.min should be(2) + secondSnapshot.max should be(2) + secondSnapshot.recordsIterator.toStream should contain( + MutableRecord(2, 3) + ) // min, max and current + } + + "report zero as the min and current values if the current value fell bellow zero" in new MinMaxCounterFixture { + mmCounter.decrement(3) + + val snapshot = collectCounterSnapshot() + + snapshot.min should be(0) + snapshot.max should be(0) + snapshot.recordsIterator.toStream should contain( + MutableRecord(0, 3) + ) // min, max and current (even while current really is -3 + } + + "never record values bellow zero in very busy situations" in new MinMaxCounterFixture { + val monitor = TestProbe() + val workers = for (workers ← 1 to 50) yield { + system.actorOf(Props(new MinMaxCounterUpdateActor(mmCounter, monitor.ref))) + } + + workers foreach (_ ! "increment") + for (refresh ← 1 to 1000) { + collectCounterSnapshot() + Thread.sleep(1) + } + + monitor.expectNoMsg() + workers foreach (_ ! PoisonPill) + } + } + + trait MinMaxCounterFixture { + val collectionContext = new CollectionContext { + val buffer: LongBuffer = LongBuffer.allocate(64) + } + + val mmCounter = MinMaxCounter(DynamicRange(1, 1000, 2), 1 hour, Kamon.metrics.settings.refreshScheduler) + mmCounter.cleanup // cancel the refresh schedule + + def collectCounterSnapshot(): Histogram.Snapshot = mmCounter.collect(collectionContext) + } +} + +class MinMaxCounterUpdateActor(mmc: MinMaxCounter, monitor: ActorRef) extends Actor { + val x = Array.ofDim[Int](4) + def receive = { + case "increment" ⇒ + mmc.increment() + self ! "decrement" + case "decrement" ⇒ + mmc.decrement() + self ! "increment" + try { + mmc.refreshValues() + } catch { + case _: IndexOutOfBoundsException ⇒ monitor ! "failed" + } + } +}
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