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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* =========================================================================================
* 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.ActorSystem
import com.typesafe.config.ConfigFactory
import kamon.metric.CollectionContext
import kamon.metric.instrument.Histogram.MutableRecord
import org.scalatest.{ Matchers, WordSpecLike }
class MinMaxCounterSpec extends WordSpecLike with Matchers {
val system = ActorSystem("min-max-counter-spec")
val minMaxCounterConfig = ConfigFactory.parseString(
"""
|refresh-interval = 1 hour
|highest-trackable-value = 1000
|significant-value-digits = 2
""".stripMargin)
"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 they 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
}
}
trait MinMaxCounterFixture {
val collectionContext = new CollectionContext {
val buffer: LongBuffer = LongBuffer.allocate(64)
}
val mmCounter = MinMaxCounter.fromConfig(minMaxCounterConfig, system).asInstanceOf[PaddedMinMaxCounter]
mmCounter.cleanup // cancel the refresh schedule
def collectCounterSnapshot(): Histogram.Snapshot = mmCounter.collect(collectionContext)
}
}
|
