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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.Kamon
import scala.util.DynamicVariable
import akka.actor._
import scala.Some
import kamon.trace.Trace.Register
import scala.concurrent.duration._
import java.util.concurrent.atomic.AtomicLong
object Trace extends ExtensionId[TraceExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: Extension] = Trace
def createExtension(system: ExtendedActorSystem): TraceExtension = new TraceExtension(system)
/*** Protocol */
case object Register
/** User API */
private[trace] val traceContext = new DynamicVariable[Option[TraceContext]](None)
private[trace] val tranid = new AtomicLong()
def context() = traceContext.value
def set(ctx: TraceContext) = traceContext.value = Some(ctx)
def clear: Unit = traceContext.value = None
def start(name: String)(implicit system: ActorSystem): TraceContext = {
val ctx = newTraceContext(name)
ctx.start(name)
set(ctx)
ctx
}
def withContext[T](ctx: Option[TraceContext])(thunk: ⇒ T): T = traceContext.withValue(ctx)(thunk)
def transformContext(f: TraceContext ⇒ TraceContext): Unit = {
context.map(f).foreach(set(_))
}
def finish(): Option[TraceContext] = {
val ctx = context()
ctx.map(_.finish)
ctx
}
// TODO: FIX
def newTraceContext(name: String)(implicit system: ActorSystem): TraceContext = TraceContext(Kamon(Trace), tranid.getAndIncrement, name)
}
class TraceExtension(system: ExtendedActorSystem) extends Kamon.Extension {
val manager: ActorRef = system.actorOf(Props[TraceManager], "kamon-trace")
}
class TraceManager extends Actor with ActorLogging {
var listeners: Seq[ActorRef] = Seq.empty
def receive = {
case Register ⇒
listeners = sender +: listeners
log.info("Registered [{}] as listener for Kamon traces", sender)
case segment: UowSegment ⇒
val tracerName = segment.id.toString
context.child(tracerName).getOrElse(newTracer(tracerName)) ! segment
case trace: UowTrace ⇒
listeners foreach (_ ! trace)
}
def newTracer(name: String): ActorRef = {
context.actorOf(UowTraceAggregator.props(self, 30 seconds), name)
}
}
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