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package kamon.trace.instrumentation
import org.aspectj.lang.annotation._
import org.aspectj.lang.ProceedingJoinPoint
import akka.actor.{Props, ActorSystem, ActorRef}
import akka.dispatch.{Envelope, MessageDispatcher}
import com.codahale.metrics.Timer
import kamon.trace.{ContextAware, TraceContext, Trace}
case class TraceableMessage(traceContext: Option[TraceContext], message: Any, timer: Timer.Context)
case class DefaultTracingAwareEnvelopeContext(traceContext: Option[TraceContext] = Trace.traceContext.value, timestamp: Long = System.nanoTime) extends ContextAware
@Aspect
class ActorCellInvokeInstrumentation {
@Pointcut("execution(akka.actor.ActorCell.new(..)) && args(system, ref, props, dispatcher, parent)")
def actorCellCreation(system: ActorSystem, ref: ActorRef, props: Props, dispatcher: MessageDispatcher, parent: ActorRef): Unit = {}
@Pointcut("(execution(* akka.actor.ActorCell.invoke(*)) || execution(* akka.routing.RoutedActorCell.sendMessage(*))) && args(envelope)")
def invokingActorBehaviourAtActorCell(envelope: Envelope) = {}
@Around("invokingActorBehaviourAtActorCell(envelope)")
def around(pjp: ProceedingJoinPoint, envelope: Envelope): Unit = {
//safe cast
val msgContext = envelope.asInstanceOf[ContextAware].traceContext
Trace.traceContext.withValue(msgContext) {
pjp.proceed()
}
}
}
@Aspect
class EnvelopeTracingContext {
@DeclareMixin("akka.dispatch.Envelope")
def mixin: ContextAware = new ContextAware {
val traceContext: Option[TraceContext] = Trace.context()
}
@Pointcut("execution(akka.dispatch.ContextAware.new(..)) && this(ctx)")
def requestRecordInit(ctx: ContextAware): Unit = {}
@After("requestRecordInit(ctx)")
def whenCreatedRequestRecord(ctx: ContextAware): Unit = {
// Necessary to force the initialization of TracingAwareRequestContext at the moment of creation.
ctx.traceContext
}
}
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