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/*
* =========================================================================================
* 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.trace
import java.net.InetAddress
import java.util.concurrent.atomic.AtomicLong
import akka.actor._
import akka.actor
import kamon.Kamon
import kamon.metric.{ Metrics, MetricsExtension }
import kamon.util.{ NanoInterval, RelativeNanoTimestamp, NanoTimestamp, GlobPathFilter }
import scala.util.Try
object Tracer extends ExtensionId[TracerExtension] with ExtensionIdProvider {
override def get(system: ActorSystem): TracerExtension = super.get(system)
def lookup(): ExtensionId[_ <: actor.Extension] = Tracer
def createExtension(system: ExtendedActorSystem): TracerExtension = new TracerExtensionImpl(system)
}
trait TracerExtension extends Kamon.Extension {
def newContext(name: String): TraceContext
def newContext(name: String, token: String): TraceContext
def newContext(name: String, token: String, timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext
def subscribe(subscriber: ActorRef): Unit
def unsubscribe(subscriber: ActorRef): Unit
}
class TracerExtensionImpl(system: ExtendedActorSystem) extends TracerExtension {
private val _settings = TraceSettings(system)
private val _metricsExtension = Metrics.get(system)
private val _hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
private val _tokenCounter = new AtomicLong
private val _subscriptions = system.actorOf(Props[TraceSubscriptions], "trace-subscriptions")
private val _incubator = system.actorOf(Incubator.props(_subscriptions))
private def newToken: String =
_hostnamePrefix + "-" + String.valueOf(_tokenCounter.incrementAndGet())
def newContext(name: String): TraceContext =
createTraceContext(name)
def newContext(name: String, token: String): TraceContext =
createTraceContext(name, token)
def newContext(name: String, token: String, timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext =
createTraceContext(name, token, timestamp, isOpen, isLocal)
private def createTraceContext(traceName: String, token: String = newToken, startTimestamp: RelativeNanoTimestamp = RelativeNanoTimestamp.now,
isOpen: Boolean = true, isLocal: Boolean = true): TraceContext = {
def newMetricsOnlyContext = new MetricsOnlyContext(traceName, token, isOpen, _settings.levelOfDetail, startTimestamp, null, _metricsExtension, system)
if (_settings.levelOfDetail == LevelOfDetail.MetricsOnly || !isLocal)
newMetricsOnlyContext
else {
if (!_settings.sampler.shouldTrace)
newMetricsOnlyContext
else
new TracingContext(traceName, token, true, _settings.levelOfDetail, isLocal, startTimestamp, null, _metricsExtension, this, system, dispatchTracingContext)
}
}
def subscribe(subscriber: ActorRef): Unit = _subscriptions ! TraceSubscriptions.Subscribe(subscriber)
def unsubscribe(subscriber: ActorRef): Unit = _subscriptions ! TraceSubscriptions.Unsubscribe(subscriber)
private[kamon] def dispatchTracingContext(trace: TracingContext): Unit =
if (_settings.sampler.shouldReport(trace.elapsedTime))
if (trace.shouldIncubate)
_incubator ! trace
else
_subscriptions ! trace.generateTraceInfo
}
case class TraceInfo(name: String, token: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String], segments: List[SegmentInfo])
case class SegmentInfo(name: String, category: String, library: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String])
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