1 files changed, 165 insertions, 0 deletions
diff --git a/kamon-core/src/test/scala/kamon/trace/instrumentation/ActorSystemMessagePassingInstrumentationSpec.scala b/kamon-core/src/test/scala/kamon/trace/instrumentation/ActorSystemMessagePassingInstrumentationSpec.scala
new file mode 100644
index 00000000..7d539370
--- /dev/null
+++ b/kamon-core/src/test/scala/kamon/trace/instrumentation/ActorSystemMessagePassingInstrumentationSpec.scala
@@ -0,0 +1,165 @@
+package kamon.trace.instrumentation
+
+import akka.testkit.{ ImplicitSender, TestKit }
+import akka.actor._
+import org.scalatest.WordSpecLike
+import kamon.trace.Trace
+import scala.util.control.NonFatal
+import akka.actor.SupervisorStrategy.{ Escalate, Stop, Restart, Resume }
+import scala.concurrent.duration._
+
+class ActorSystemMessagePassingInstrumentationSpec extends TestKit(ActorSystem("actor-message-passing-tracing-spec")) with WordSpecLike with ImplicitSender {
+  implicit val executionContext = system.dispatcher
+
+  "the system message passing instrumentation" should {
+    "keep the TraceContext while processing the Create message in top level actors" in new TraceContextFixture {
+      Trace.withContext(testTraceContext) {
+        system.actorOf(Props(new Actor {
+
+          testActor ! Trace.context()
+
+          def receive: Actor.Receive = { case any ⇒ }
+        }))
+      }
+
+      expectMsg(testTraceContext)
+    }
+
+    "keep the TraceContext while processing the Create message in non top level actors" in new TraceContextFixture {
+      Trace.withContext(testTraceContext) {
+        system.actorOf(Props(new Actor {
+          def receive: Actor.Receive = {
+            case any ⇒
+              context.actorOf(Props(new Actor {
+
+                testActor ! Trace.context()
+
+                def receive: Actor.Receive = { case any ⇒ }
+              }))
+          }
+        })) ! "any"
+      }
+
+      expectMsg(testTraceContext)
+    }
+
+    "keep the TraceContext in the supervision cycle" when {
+      "the actor is resumed" in new TraceContextFixture {
+        val supervisor = supervisorWithDirective(Resume)
+
+        Trace.withContext(testTraceContext) {
+          supervisor ! "fail"
+        }
+
+        expectMsg(testTraceContext) // From the parent executing the supervision strategy
+
+        // Ensure we didn't tie the actor with the context
+        supervisor ! "context"
+        expectMsg(None)
+      }
+
+      "the actor is restarted" in new TraceContextFixture {
+        val supervisor = supervisorWithDirective(Restart, sendPreRestart = true, sendPostRestart = true)
+
+        Trace.withContext(testTraceContext) {
+          supervisor ! "fail"
+        }
+
+        expectMsg(testTraceContext) // From the parent executing the supervision strategy
+        expectMsg(testTraceContext) // From the preRestart hook
+        expectMsg(testTraceContext) // From the postRestart hook
+
+        // Ensure we didn't tie the actor with the context
+        supervisor ! "context"
+        expectMsg(None)
+      }
+
+      "the actor is stopped" in new TraceContextFixture {
+        val supervisor = supervisorWithDirective(Stop, sendPostStop = true)
+
+        Trace.withContext(testTraceContext) {
+          supervisor ! "fail"
+        }
+
+        expectMsg(testTraceContext) // From the parent executing the supervision strategy
+        expectMsg(testTraceContext) // From the postStop hook
+        expectNoMsg(1 second)
+      }
+
+      "the failure is escalated" in new TraceContextFixture {
+        val supervisor = supervisorWithDirective(Escalate, sendPostStop = true)
+
+        Trace.withContext(testTraceContext) {
+          supervisor ! "fail"
+        }
+
+        expectMsg(testTraceContext) // From the parent executing the supervision strategy
+        expectMsg(testTraceContext) // From the grandparent executing the supervision strategy
+        expectMsg(testTraceContext) // From the postStop hook in the child
+        expectMsg(testTraceContext) // From the postStop hook in the parent
+        expectNoMsg(1 second)
+      }
+    }
+  }
+
+  def supervisorWithDirective(directive: SupervisorStrategy.Directive, sendPreRestart: Boolean = false, sendPostRestart: Boolean = false,
+                              sendPostStop: Boolean = false, sendPreStart: Boolean = false): ActorRef = {
+    class GrandParent extends Actor {
+      val child = context.actorOf(Props(new Parent))
+
+      override def supervisorStrategy: SupervisorStrategy = OneForOneStrategy() {
+        case NonFatal(throwable) ⇒ testActor ! Trace.context(); Stop
+      }
+
+      def receive = {
+        case any ⇒ child forward any
+      }
+    }
+
+    class Parent extends Actor {
+      val child = context.actorOf(Props(new Child))
+
+      override def supervisorStrategy: SupervisorStrategy = OneForOneStrategy() {
+        case NonFatal(throwable) ⇒ testActor ! Trace.context(); directive
+      }
+
+      def receive: Actor.Receive = {
+        case any ⇒ child forward any
+      }
+
+      override def postStop(): Unit = {
+        if (sendPostStop) testActor ! Trace.context()
+        super.postStop()
+      }
+    }
+
+    class Child extends Actor {
+      def receive = {
+        case "fail"    ⇒ 1 / 0
+        case "context" ⇒ sender ! Trace.context()
+      }
+
+      override def preRestart(reason: Throwable, message: Option[Any]): Unit = {
+        if (sendPreRestart) testActor ! Trace.context()
+        super.preRestart(reason, message)
+      }
+
+      override def postRestart(reason: Throwable): Unit = {
+        if (sendPostRestart) testActor ! Trace.context()
+        super.postRestart(reason)
+      }
+
+      override def postStop(): Unit = {
+        if (sendPostStop) testActor ! Trace.context()
+        super.postStop()
+      }
+
+      override def preStart(): Unit = {
+        if (sendPreStart) testActor ! Trace.context()
+        super.preStart()
+      }
+    }
+
+    system.actorOf(Props(new GrandParent))
+  }
+}