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/* =========================================================================================
* 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}
object Kamon {
trait Extension extends actor.Extension
@volatile private var kamonInstance = new Instance()
def config = kamonInstance.config
def metrics = kamonInstance.metrics
def tracer = kamonInstance.tracer
def start(): Unit = synchronized {
kamonInstance.start()
}
def start(conf: Config): Unit = synchronized {
kamonInstance.start(conf)
}
def shutdown(): Unit = synchronized {
kamonInstance.shutdown()
kamonInstance = new Instance()
}
private class Instance() {
private val log = LazyLogger(classOf[Instance])
private var actorSystem: ActorSystem = _
var started = false
var config: Config = defaultConfig
val metrics = MetricsModuleImpl(config)
val tracer = TracerModuleImpl(metrics, config)
private lazy val _start = {
log.info("Initializing Kamon...")
tryLoadAutoweaveModule()
actorSystem = ActorSystem("kamon", config)
metrics.start(actorSystem, config)
tracer.start(actorSystem, config)
actorSystem.registerExtension(ModuleLoader)
started = true
}
def start(): Unit = {
_start
}
def start(conf: Config): Unit = {
config = patchConfiguration(conf)
_start
}
def shutdown(): Unit = {
if (started) {
actorSystem.terminate()
}
}
private def defaultConfig = {
patchConfiguration(
ConfigFactory.load(
this.getClass.getClassLoader,
ConfigParseOptions.defaults(),
ConfigResolveOptions.defaults().setAllowUnresolved(true)
)
)
}
private def patchConfiguration(config: Config): Config = {
val internalConfig = config.getConfig("kamon.internal-config")
config
.withoutPath("akka")
.withoutPath("spray")
.withFallback(internalConfig)
}
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 load time 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}.")
}
}
}
}
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