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package kamon.metric.instrument
import java.nio.LongBuffer
import kamon.metric.CollectionContext
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)
}
}
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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