blob: 094baf4c796b300c30a02f47642f6fc67be89dbd (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* =========================================================================================
* 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)
}
}
trait CounterFixture {
val counter = Counter()
val collectionContext = new CollectionContext {
val buffer: LongBuffer = LongBuffer.allocate(1)
}
def takeSnapshotFrom(counter: Counter): Counter.Snapshot = counter.collect(collectionContext)
}
}
|