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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.util.concurrent.TimeUnit
import akka.actor._
import akka.actor
import akka.event.Logging
import kamon._
import kamon.metric.Metrics
import kamon.util.GlobPathFilter
class TraceExtension(system: ExtendedActorSystem) extends Kamon.Extension {
val config = system.settings.config.getConfig("kamon.trace")
val dispatcher = system.dispatchers.lookup(config.getString("dispatcher"))
val detailLevel: LevelOfDetail = config.getString("level") match {
case "metrics-only" ⇒ LevelOfDetail.MetricsOnly
case "simple-trace" ⇒ LevelOfDetail.SimpleTrace
case other ⇒ sys.error(s"Unknown tracing level $other present in the configuration file.")
}
val sampler: Sampler =
if (detailLevel == LevelOfDetail.MetricsOnly) NoSampling
else config.getString("sampling") match {
case "all" ⇒ SampleAll
case "random" ⇒ new RandomSampler(config.getInt("random-sampler.chance"))
case "ordered" ⇒ new OrderedSampler(config.getInt("ordered-sampler.interval"))
case "threshold" ⇒ new ThresholdSampler(config.getDuration("threshold-sampler.minimum-elapsed-time", TimeUnit.NANOSECONDS))
}
val log = Logging(system, "TraceExtension")
val subscriptions = system.actorOf(Props[TraceSubscriptions], "trace-subscriptions")
val incubator = system.actorOf(Incubator.props(subscriptions))
val metricsExtension = Kamon(Metrics)(system)
def newTraceContext(traceName: String, token: String, origin: TraceContextOrigin, system: ActorSystem): TraceContext =
newTraceContext(traceName, token, true, origin, RelativeNanoTimestamp.now, system)
def newTraceContext(traceName: String, token: String, isOpen: Boolean, origin: TraceContextOrigin,
startTimestamp: RelativeNanoTimestamp, system: ActorSystem): TraceContext = {
def newMetricsOnlyContext = new MetricsOnlyContext(traceName, token, isOpen, detailLevel, origin, startTimestamp, log, metricsExtension, system)
if (detailLevel == LevelOfDetail.MetricsOnly || origin == TraceContextOrigin.Remote)
newMetricsOnlyContext
else {
if (!sampler.shouldTrace)
newMetricsOnlyContext
else
new TracingContext(traceName, token, true, detailLevel, origin, startTimestamp, log, metricsExtension, this, system)
}
}
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 (sampler.shouldReport(trace.elapsedTime))
if (trace.shouldIncubate)
incubator ! trace
else
subscriptions ! trace.generateTraceInfo
}
object Trace extends ExtensionId[TraceExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = Trace
def createExtension(system: ExtendedActorSystem): TraceExtension = new TraceExtension(system)
case class MetricGroupFilter(includes: List[GlobPathFilter], excludes: List[GlobPathFilter]) {
def accept(name: String): Boolean = includes.exists(_.accept(name)) && !excludes.exists(_.accept(name))
}
}
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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