From 7a10c0ef2a6566229e8571f6d385ca2ff794cc20 Mon Sep 17 00:00:00 2001
From: Ivan Topolnak <itopolnak@despegar.com>
Date: Thu, 2 Jan 2014 18:09:53 -0300
Subject: integrate trace and metrics into the base project

---
 .../ActorMessagePassingTracing.scala               | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 kamon-core/src/main/scala/akka/instrumentation/ActorMessagePassingTracing.scala

(limited to 'kamon-core/src/main/scala/akka/instrumentation/ActorMessagePassingTracing.scala')

diff --git a/kamon-core/src/main/scala/akka/instrumentation/ActorMessagePassingTracing.scala b/kamon-core/src/main/scala/akka/instrumentation/ActorMessagePassingTracing.scala
new file mode 100644
index 00000000..6cede344
--- /dev/null
+++ b/kamon-core/src/main/scala/akka/instrumentation/ActorMessagePassingTracing.scala
@@ -0,0 +1,93 @@
+/* ===================================================
+ * 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 akka.instrumentation
+
+import org.aspectj.lang.annotation._
+import org.aspectj.lang.ProceedingJoinPoint
+import akka.actor.{ Cell, Props, ActorSystem, ActorRef }
+import akka.dispatch.{ Envelope, MessageDispatcher }
+import kamon.trace.{ TraceContext, ContextAware, Trace }
+import kamon.metrics.{ HdrActorMetricsRecorder, ActorMetrics }
+import kamon.Kamon
+
+@Aspect("perthis(actorCellCreation(*, *, *, *, *))")
+class BehaviourInvokeTracing {
+  var path: Option[String] = None
+  var actorMetrics: Option[HdrActorMetricsRecorder] = None
+
+  @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 = {}
+
+  @After("actorCellCreation(system, ref, props, dispatcher, parent)")
+  def afterCreation(system: ActorSystem, ref: ActorRef, props: Props, dispatcher: MessageDispatcher, parent: ActorRef): Unit = {
+    val metricsExtension = Kamon(ActorMetrics)(system)
+    val simplePathString = ref.path.elements.mkString("/")
+
+    if (metricsExtension.shouldTrackActor(simplePathString)) {
+      path = Some(ref.path.toString)
+      actorMetrics = Some(metricsExtension.registerActor(simplePathString))
+    }
+  }
+
+  @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 = {
+    val timestampBeforeProcessing = System.nanoTime()
+    val contextAndTimestamp = envelope.asInstanceOf[ContextAndTimestampAware]
+
+    Trace.withContext(contextAndTimestamp.traceContext) {
+      pjp.proceed()
+    }
+
+    actorMetrics.map { am ⇒
+      am.recordProcessingTime(System.nanoTime() - timestampBeforeProcessing)
+      am.recordTimeInMailbox(timestampBeforeProcessing - contextAndTimestamp.timestamp)
+    }
+  }
+
+  @Pointcut("execution(* akka.actor.ActorCell.stop()) && this(cell)")
+  def actorStop(cell: Cell): Unit = {}
+
+  @After("actorStop(cell)")
+  def afterStop(cell: Cell): Unit = {
+    path.map(p ⇒ Kamon(ActorMetrics)(cell.system).unregisterActor(p))
+  }
+}
+
+@Aspect
+class EnvelopeTraceContextMixin {
+
+  @DeclareMixin("akka.dispatch.Envelope")
+  def mixin: ContextAndTimestampAware = new ContextAndTimestampAware {
+    val traceContext: Option[TraceContext] = Trace.context()
+    val timestamp: Long = System.nanoTime()
+  }
+
+  @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
+  }
+}
+
+trait ContextAndTimestampAware extends ContextAware {
+  def timestamp: Long
+}
-- 
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