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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 kamon.{ MilliTimestamp, RelativeNanoTimestamp, Kamon }
import scala.language.experimental.macros
import java.util.concurrent.atomic.AtomicLong
import kamon.macros.InlineTraceContextMacro
import scala.util.Try
import java.net.InetAddress
import akka.actor.ActorSystem
object TraceRecorder {
private val traceContextStorage = new ThreadLocal[TraceContext] {
override def initialValue(): TraceContext = EmptyTraceContext
}
private val tokenCounter = new AtomicLong
private val hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
def newToken: String = hostnamePrefix + "-" + String.valueOf(tokenCounter.incrementAndGet())
private def newTraceContext(name: String, token: Option[String], system: ActorSystem): TraceContext =
Kamon(Trace)(system).newTraceContext(name, token.getOrElse(newToken), TraceContextOrigin.Local, system)
def joinRemoteTraceContext(traceName: String, traceToken: String, startTimestamp: MilliTimestamp, isOpen: Boolean, system: ActorSystem): TraceContext = {
val equivalentStartTimestamp = RelativeNanoTimestamp.relativeTo(startTimestamp)
Kamon(Trace)(system).newTraceContext(traceName, traceToken, isOpen, TraceContextOrigin.Remote, equivalentStartTimestamp, system)
}
def setContext(context: TraceContext): Unit = traceContextStorage.set(context)
def clearContext: Unit = traceContextStorage.set(EmptyTraceContext)
def currentContext: TraceContext = traceContextStorage.get()
def start(name: String, token: Option[String] = None)(implicit system: ActorSystem) = {
val ctx = newTraceContext(name, token, system)
traceContextStorage.set(ctx)
}
def rename(name: String): Unit = currentContext.rename(name)
def withNewTraceContext[T](name: String, token: Option[String] = None)(thunk: ⇒ T)(implicit system: ActorSystem): T =
withTraceContext(newTraceContext(name, token, system))(thunk)
def withTraceContext[T](context: TraceContext)(thunk: ⇒ T): T = {
val oldContext = currentContext
setContext(context)
try thunk finally setContext(oldContext)
}
def withTraceContextAndSystem[T](thunk: (TraceContext, ActorSystem) ⇒ T): Option[T] = currentContext match {
case ctx: MetricsOnlyContext ⇒ Some(thunk(ctx, ctx.system))
case EmptyTraceContext ⇒ None
}
def withInlineTraceContextReplacement[T](traceCtx: TraceContext)(thunk: ⇒ T): T = macro InlineTraceContextMacro.withInlineTraceContextImpl[T, TraceContext]
def finish(): Unit = currentContext.finish()
}
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