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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 com.typesafe.config.Config
import kamon.metric.Metrics
import kamon.util._
import scala.util.Try
trait Tracer {
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
}
object Tracer {
private[kamon] val _traceContextStorage = new ThreadLocal[TraceContext] {
override def initialValue(): TraceContext = EmptyTraceContext
}
def currentContext: TraceContext =
_traceContextStorage.get()
def setCurrentContext(context: TraceContext): Unit =
_traceContextStorage.set(context)
def clearCurrentContext: Unit =
_traceContextStorage.remove()
def withContext[T](context: TraceContext)(code: ⇒ T): T = {
val oldContext = _traceContextStorage.get()
_traceContextStorage.set(context)
try code finally _traceContextStorage.set(oldContext)
}
}
private[kamon] class TracerImpl(metricsExtension: Metrics, config: Config) extends Tracer {
private val _settings = TraceSettings(config)
private val _hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
private val _tokenCounter = new AtomicLong
private val _subscriptions = new LazyActorRef
private val _incubator = new LazyActorRef
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)
if (_settings.levelOfDetail == LevelOfDetail.MetricsOnly || !isLocal)
newMetricsOnlyContext
else {
if (!_settings.sampler.shouldTrace)
newMetricsOnlyContext
else
new TracingContext(traceName, token, true, _settings.levelOfDetail, isLocal, startTimestamp, null, dispatchTracingContext)
}
}
def subscribe(subscriber: ActorRef): Unit =
_subscriptions.tell(TraceSubscriptions.Subscribe(subscriber))
def unsubscribe(subscriber: ActorRef): Unit =
_subscriptions.tell(TraceSubscriptions.Unsubscribe(subscriber))
private[kamon] def dispatchTracingContext(trace: TracingContext): Unit =
if (_settings.sampler.shouldReport(trace.elapsedTime))
if (trace.shouldIncubate)
_incubator.tell(trace)
else
_subscriptions.tell(trace.generateTraceInfo)
/**
* Tracer Extension initialization.
*/
private var _system: ActorSystem = null
private lazy val _start = {
val subscriptions = _system.actorOf(Props[TraceSubscriptions], "trace-subscriptions")
_subscriptions.point(subscriptions)
_incubator.point(_system.actorOf(Incubator.props(subscriptions)))
}
def start(system: ActorSystem): Unit = synchronized {
_system = system
_start
_system = null
}
}
private[kamon] object TracerImpl {
def apply(metricsExtension: Metrics, config: Config) =
new TracerImpl(metricsExtension, config)
}
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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