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
125
126
127
128
|
/* =========================================================================================
* Copyright © 2013-2016 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
import _root_.akka.actor
import _root_.akka.actor._
import com.typesafe.config.{Config, ConfigFactory, ConfigParseOptions, ConfigResolveOptions}
import kamon.metric._
import kamon.trace.TracerModuleImpl
import kamon.util.logger.LazyLogger
import _root_.scala.util.control.NonFatal
import _root_.scala.util.{Failure, Success, Try}
trait ConfigProvider {
def config: Config
final def patchedConfig: Config = {
val internalConfig = config.getConfig("kamon.internal-config")
config
.withoutPath("akka")
.withoutPath("spray")
.withFallback(internalConfig)
}
}
object Kamon {
private val log = LazyLogger("Kamon")
trait Extension extends actor.Extension
def defaultConfig = ConfigFactory.load(this.getClass.getClassLoader, ConfigParseOptions.defaults(), ConfigResolveOptions.defaults().setAllowUnresolved(true))
class KamonDefaultConfigProvider extends ConfigProvider {
def config = resolveConfiguration
private def resolveConfiguration: Config = {
val defaultConf = defaultConfig
defaultConf.getString("kamon.config-provider") match {
case "default" ⇒ defaultConf
case fqcn ⇒
val dynamic = new ReflectiveDynamicAccess(getClass.getClassLoader)
dynamic.createInstanceFor[ConfigProvider](fqcn, Nil).get.config
}
}
}
class KamonConfigProvider(_config: Config) extends ConfigProvider {
def config = _config
}
private[kamon] var configProvider: Option[ConfigProvider] = None
def config: Config =
configProvider match {
case Some(provider) ⇒ provider.config
case None ⇒ throw new Exception("Kamon.start() not called yet")
}
lazy val metrics = MetricsModuleImpl(config)
lazy val tracer = TracerModuleImpl(metrics, config)
private lazy val _system = {
val patchedConfig =
configProvider match {
case Some(provider) ⇒ provider.patchedConfig
case None ⇒
throw new Exception("Kamon.start() not called yet")
}
log.info("Initializing Kamon...")
tryLoadAutoweaveModule()
ActorSystem("kamon", patchedConfig)
}
private lazy val _start = {
metrics.start(_system)
tracer.start(_system)
_system.registerExtension(ModuleLoader)
}
def start(): Unit = {
configProvider = Some(new KamonDefaultConfigProvider())
_start
}
def start(conf: Config): Unit = {
configProvider = Some(new KamonConfigProvider(conf))
_start
}
def start(provider: ConfigProvider): Unit = {
configProvider = Some(provider)
_start
}
def shutdown(): Unit = {
_system.shutdown()
}
private def tryLoadAutoweaveModule(): Unit = {
Try {
val autoweave = Class.forName("kamon.autoweave.Autoweave")
autoweave.getDeclaredMethod("attach").invoke(autoweave.newInstance())
} match {
case Success(_) ⇒
val color = (msg: String) ⇒ s"""\u001B[32m${msg}\u001B[0m"""
log.info(color("Kamon-autoweave has been successfully loaded."))
log.info(color("The AspectJ loadtime weaving agent is now attached to the JVM (you don't need to use -javaagent)."))
log.info(color("This offers extra flexibility but obviously any classes loaded before attachment will not be woven."))
case Failure(NonFatal(reason)) ⇒ log.debug(s"Kamon-autoweave failed to load. Reason: ${reason.getMessage}.")
}
}
}
|
