Little clean up to actor message passing tracing

1 files changed, 45 insertions, 0 deletions

diff --git a/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorMessagePassingTracing.scala b/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorMessagePassingTracing.scala
new file mode 100644
index 00000000..9eb0a7f9
--- /dev/null
+++ b/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorMessagePassingTracing.scala
@@ -0,0 +1,45 @@
+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}
+
+
+@Aspect
+class BehaviourInvokeTracing {
+
+  @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 aroundBehaviourInvoke(pjp: ProceedingJoinPoint, envelope: Envelope): Unit = {
+    //safe cast
+    val ctxInMessage = envelope.asInstanceOf[ContextAware].traceContext
+
+    Trace.withValue(ctxInMessage) {
+      pjp.proceed()
+    }
+  }
+}
+
+@Aspect
+class EnvelopeTraceContextMixin {
+
+  @DeclareMixin("akka.dispatch.Envelope")
+  def mixin: ContextAware = ContextAware.default
+
+  @Pointcut("execution(akka.dispatch.Envelope.new(..)) && this(ctx)")
+  def envelopeCreation(ctx: ContextAware): Unit = {}
+
+  @After("envelopeCreation(ctx)")
+  def afterEnvelopeCreation(ctx: ContextAware): Unit = {
+    // Necessary to force the initialization of ContextAware at the moment of creation.
+    ctx.traceContext
+  }
+}