package kamon.instrumentation
import org.aspectj.lang.annotation.{Before, Around, Pointcut, Aspect}
import org.aspectj.lang.ProceedingJoinPoint
import akka.actor.{Props, ActorSystem, ActorRef}
import kamon.{Kamon, TraceContext}
import akka.dispatch.Envelope
import com.codahale.metrics.{ExponentiallyDecayingReservoir, Histogram}
import kamon.metric.{MetricDirectory, Metrics}
case class TraceableMessage(traceContext: Option[TraceContext], message: Any, timeStamp: Long = System.nanoTime())
@Aspect
class ActorRefTellInstrumentation {
import ProceedingJoinPointPimp._
@Pointcut("execution(* akka.actor.ScalaActorRef+.$bang(..)) && !within(akka.pattern.PromiseActorRef) && args(message, sender)")
def sendingMessageToActorRef(message: Any, sender: ActorRef) = {}
@Around("sendingMessageToActorRef(message, sender)")
def around(pjp: ProceedingJoinPoint, message: Any, sender: ActorRef): Unit = pjp.proceedWith(TraceableMessage(Kamon.context, message))
}
@Aspect("perthis(actorCellCreation(..))")
class ActorCellInvokeInstrumentation {
val latencyHistogram: Histogram = new Histogram(new ExponentiallyDecayingReservoir)
var shouldTrack = false
@Pointcut("execution(akka.actor.ActorCell.new(..)) && args(system, ref, props, parent)")
def actorCellCreation(system: ActorSystem, ref: ActorRef, props: Props, parent: ActorRef): Unit = {}
@Before("actorCellCreation(system, ref, props, parent)")
def registerMetricsInRegistry(system: ActorSystem, ref: ActorRef, props: Props, parent: ActorRef): Unit = {
val actorName = MetricDirectory.nameForActor(ref)
val histogramName = MetricDirectory.nameForMailbox(system.name, actorName)
// TODO: Find a better way to filter the thins we don't want to measure.
if(system.name != "kamon" && actorName.startsWith("/user")) {
Metrics.registry.register(histogramName + "/cell", latencyHistogram)
shouldTrack = true
}
}
@Pointcut("execution(* akka.actor.ActorCell.invoke(*)) && args(envelope)")
def invokingActorBehaviourAtActorCell(envelope: Envelope) = {}
@Around("invokingActorBehaviourAtActorCell(envelope)")
def around(pjp: ProceedingJoinPoint, envelope: Envelope): Unit = {
import ProceedingJoinPointPimp._
envelope match {
case Envelope(TraceableMessage(ctx, msg, timeStamp), sender) => {
latencyHistogram.update(System.nanoTime() - timeStamp)
val originalEnvelope = envelope.copy(message = msg)
ctx match {
case Some(c) => {
Kamon.set(c)
pjp.proceedWith(originalEnvelope)
Kamon.clear
}
case None => pjp.proceedWith(originalEnvelope)
}
}
case _ => pjp.proceed
}
}
}