1 files changed, 55 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/instrumentation/akka/AskPatternInstrumentation.scala b/kamon-core/src/main/scala/kamon/instrumentation/akka/AskPatternInstrumentation.scala
new file mode 100644
index 00000000..5e8175fa
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/instrumentation/akka/AskPatternInstrumentation.scala
@@ -0,0 +1,55 @@
+/*
+ * =========================================================================================
+ * Copyright © 2013-2014 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 akka.actor.ActorRefProvider
+import akka.event.Logging.Warning
+import akka.pattern.{ AskTimeoutException, PromiseActorRef }
+import kamon.Kamon
+import kamon.trace.Trace
+import org.aspectj.lang.annotation.{ AfterReturning, Aspect, Pointcut }
+
+import scala.compat.Platform.EOL
+
+@Aspect
+class AskPatternInstrumentation {
+
+  class StackTraceCaptureException extends Throwable
+
+  @Pointcut(value = "execution(* akka.pattern.PromiseActorRef$.apply(..)) && args(provider, *)", argNames = "provider")
+  def promiseActorRefApply(provider: ActorRefProvider): Unit = {}
+
+  @AfterReturning(pointcut = "promiseActorRefApply(provider)", returning = "promiseActor")
+  def hookAskTimeoutWarning(provider: ActorRefProvider, promiseActor: PromiseActorRef): Unit = {
+    val system = promiseActor.provider.guardian.underlying.system
+    val traceExtension = Kamon(Trace)(system)
+
+    if (traceExtension.enableAskPatternTracing) {
+      val future = promiseActor.result.future
+      implicit val ec = system.dispatcher
+      val stack = new StackTraceCaptureException
+
+      future onFailure {
+        case timeout: AskTimeoutException ⇒
+          val stackString = stack.getStackTrace.drop(3).mkString("", EOL, EOL)
+
+          system.eventStream.publish(Warning("AskPatternTracing", classOf[AskPatternInstrumentation],
+            "Timeout triggered for ask pattern registered at: " + stackString))
+      }
+    }
+  }
+}