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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* =========================================================================================
* Copyright © 2013 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.metrics
import scala.collection.concurrent.TrieMap
import akka.actor.{ ExtensionIdProvider, ExtensionId, ExtendedActorSystem }
import com.typesafe.config.Config
import kamon.util.GlobPathFilter
import kamon.Kamon
import akka.actor
import kamon.metrics.Metrics.MetricGroupFilter
case class MetricGroupIdentity(name: String, category: MetricGroupIdentity.Category)
trait MetricIdentity {
def name: String
}
trait MetricGroupRecorder {
def record(identity: MetricIdentity, value: Long)
def collect: MetricGroupSnapshot
}
trait MetricGroupSnapshot {
def metrics: Map[MetricIdentity, MetricSnapshot]
}
trait MetricRecorder {
def record(value: Long)
def collect(): MetricSnapshot
}
trait MetricSnapshot {
def numberOfMeasurements: Long
def measurementLevels: Vector[MetricSnapshot.Measurement]
}
object MetricSnapshot {
case class Measurement(value: Long, count: Long)
}
case class DefaultMetricSnapshot(numberOfMeasurements: Long, measurementLevels: Vector[MetricSnapshot.Measurement]) extends MetricSnapshot
object MetricGroupIdentity {
trait Category {
def name: String
}
}
trait MetricGroupFactory {
type Group <: MetricGroupRecorder
def create(config: Config): Group
}
class MetricsExtension(val system: ExtendedActorSystem) extends Kamon.Extension {
val config = system.settings.config
val storage = TrieMap[MetricGroupIdentity, MetricGroupRecorder]()
val filters = loadFilters(config)
def register(name: String, category: MetricGroupIdentity.Category with MetricGroupFactory): Option[category.Group] = {
if (shouldTrack(name, category))
Some(storage.getOrElseUpdate(MetricGroupIdentity(name, category), category.create(config)).asInstanceOf[category.Group])
else
None
}
def unregister(name: String, category: MetricGroupIdentity.Category with MetricGroupFactory): Unit = {
storage.remove(MetricGroupIdentity(name, category))
}
def collect: Map[MetricGroupIdentity, MetricGroupSnapshot] = {
(for ((identity, recorder) ← storage) yield (identity, recorder.collect)).toMap
}
private def shouldTrack(name: String, category: MetricGroupIdentity.Category): Boolean = {
filters.get(category.name).map(filter ⇒ filter.accept(name)).getOrElse(false)
}
def loadFilters(config: Config): Map[String, MetricGroupFilter] = {
import scala.collection.JavaConverters._
val filters = config.getObjectList("kamon.metrics.filters").asScala
val allFilters =
for (
filter ← filters;
entry ← filter.entrySet().asScala
) yield {
val key = entry.getKey
val keyBasedConfig = entry.getValue.atKey(key)
val includes = keyBasedConfig.getStringList(s"$key.includes").asScala.map(inc ⇒ new GlobPathFilter(inc)).toList
val excludes = keyBasedConfig.getStringList(s"$key.excludes").asScala.map(exc ⇒ new GlobPathFilter(exc)).toList
(key, MetricGroupFilter(includes, excludes))
}
allFilters.toMap
}
}
object Metrics extends ExtensionId[MetricsExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = Metrics
def createExtension(system: ExtendedActorSystem): MetricsExtension = new MetricsExtension(system)
case class MetricGroupFilter(includes: List[GlobPathFilter], excludes: List[GlobPathFilter]) {
def accept(name: String): Boolean = includes.exists(_.accept(name)) && !excludes.exists(_.accept(name))
}
}
|