diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/trace/TracerModule.scala')
| -rw-r--r-- | kamon-core/src/main/scala/kamon/trace/TracerModule.scala | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/trace/TracerModule.scala b/kamon-core/src/main/scala/kamon/trace/TracerModule.scala new file mode 100644 index 00000000..416af20e --- /dev/null +++ b/kamon-core/src/main/scala/kamon/trace/TracerModule.scala @@ -0,0 +1,172 @@ +/* + * ========================================================================================= + * 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.Kamon +import kamon.metric.MetricsModule +import kamon.util._ + +import scala.util.Try + +trait TracerModule { + def newContext(name: String): TraceContext + def newContext(name: String, token: Option[String]): TraceContext + def newContext(name: String, token: Option[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) + } + + // Java variant. + def withContext[T](context: TraceContext, code: Supplier[T]): T = + withContext(context)(code.get) + + def withNewContext[T](traceName: String, traceToken: Option[String], autoFinish: Boolean)(code: ⇒ T): T = { + withContext(Kamon.tracer.newContext(traceName, traceToken)) { + val codeResult = code + if (autoFinish) + currentContext.finish() + + codeResult + } + } + + def withNewContext[T](traceName: String)(code: ⇒ T): T = + withNewContext(traceName, None, false)(code) + + def withNewContext[T](traceName: String, traceToken: Option[String])(code: ⇒ T): T = + withNewContext(traceName, traceToken, false)(code) + + def withNewContext[T](traceName: String, autoFinish: Boolean)(code: ⇒ T): T = + withNewContext(traceName, None, autoFinish)(code) + + // Java variants. + def withNewContext[T](traceName: String, traceToken: Option[String], autoFinish: Boolean, code: Supplier[T]): T = + withNewContext(traceName, traceToken, autoFinish)(code.get) + + def withNewContext[T](traceName: String, code: Supplier[T]): T = + withNewContext(traceName, None, false)(code.get) + + def withNewContext[T](traceName: String, traceToken: Option[String], code: Supplier[T]): T = + withNewContext(traceName, traceToken, false)(code.get) + + def withNewContext[T](traceName: String, autoFinish: Boolean, code: Supplier[T]): T = + withNewContext(traceName, None, autoFinish)(code.get) +} + +private[kamon] class TracerModuleImpl(metricsExtension: MetricsModule, config: Config) extends TracerModule { + 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, None) + + def newContext(name: String, token: Option[String]): TraceContext = + createTraceContext(name, token) + + def newContext(name: String, token: Option[String], timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext = + createTraceContext(name, token, timestamp, isOpen, isLocal) + + private def createTraceContext(traceName: String, token: Option[String], startTimestamp: RelativeNanoTimestamp = RelativeNanoTimestamp.now, + isOpen: Boolean = true, isLocal: Boolean = true): TraceContext = { + + def newMetricsOnlyContext(token: String): TraceContext = + new MetricsOnlyContext(traceName, token, isOpen, _settings.levelOfDetail, startTimestamp, null) + + val traceToken = token.getOrElse(newToken) + + if (_settings.levelOfDetail == LevelOfDetail.MetricsOnly || !isLocal) + newMetricsOnlyContext(traceToken) + else { + if (!_settings.sampler.shouldTrace) + newMetricsOnlyContext(traceToken) + else + new TracingContext(traceName, traceToken, 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 TracerModuleImpl { + + def apply(metricsExtension: MetricsModule, config: Config) = + new TracerModuleImpl(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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