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/*
* =========================================================================================
* 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.instrument
import java.nio.LongBuffer
import org.scalatest.{Matchers, WordSpec}
class CounterSpec extends WordSpec with Matchers {
"a Counter" should {
"allow increment only operations" in new CounterFixture {
counter.increment()
counter.increment(10)
intercept[UnsupportedOperationException] {
counter.increment(-10)
}
}
"reset to zero when a snapshot is taken" in new CounterFixture {
counter.increment(100)
takeSnapshotFrom(counter).count should be(100)
takeSnapshotFrom(counter).count should be(0)
takeSnapshotFrom(counter).count should be(0)
counter.increment(50)
takeSnapshotFrom(counter).count should be(50)
takeSnapshotFrom(counter).count should be(0)
}
"produce a snapshot that can be merged with others" in new CounterFixture {
val counterA = Counter()
val counterB = Counter()
counterA.increment(100)
counterB.increment(200)
val counterASnapshot = takeSnapshotFrom(counterA)
val counterBSnapshot = takeSnapshotFrom(counterB)
counterASnapshot.merge(counterBSnapshot, collectionContext).count should be(300)
counterBSnapshot.merge(counterASnapshot, collectionContext).count should be(300)
}
"produce a snapshot that can be scaled" in new CounterFixture {
counter.increment(100)
val counterSnapshot = takeSnapshotFrom(counter)
val scaledSnapshot = counterSnapshot.scale(Time.Milliseconds, Time.Microseconds)
scaledSnapshot.count should be(100000)
}
}
trait CounterFixture {
val counter = Counter()
val collectionContext = new CollectionContext {
val buffer: LongBuffer = LongBuffer.allocate(1)
}
def takeSnapshotFrom(counter: Counter): Counter.Snapshot = counter.collect(collectionContext)
}
}
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