From e94894c5ec60a1102884894c4e73b441c79c70bc Mon Sep 17 00:00:00 2001
From: Diego <diegolparra@gmail.com>
Date: Sat, 5 Apr 2014 19:48:34 -0300
Subject: + kamon-core: added UnboundedMailboxInstrumentation to avoid O(n)
 time in .numberOfMessages

---
 kamon-core/src/main/resources/META-INF/aop.xml     |  3 ++
 .../UnboundedMailboxInstrumentation.scala          | 58 ++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 kamon-core/src/main/scala/akka/instrumentation/UnboundedMailboxInstrumentation.scala

diff --git a/kamon-core/src/main/resources/META-INF/aop.xml b/kamon-core/src/main/resources/META-INF/aop.xml
index 180d905b..27a047b0 100644
--- a/kamon-core/src/main/resources/META-INF/aop.xml
+++ b/kamon-core/src/main/resources/META-INF/aop.xml
@@ -16,6 +16,9 @@
 
     <!-- Patterns -->
     <aspect name="akka.instrumentation.AskPatternTracing"/>
+
+    <!-- UnboundedMailbox -->
+    <aspect name="akka.instrumentation.UnboundedMailboxInstrumentation"/>
   </aspects>
 
   <weaver options="-XmessageHandlerClass:kamon.weaver.logging.KamonWeaverMessageHandler">
diff --git a/kamon-core/src/main/scala/akka/instrumentation/UnboundedMailboxInstrumentation.scala b/kamon-core/src/main/scala/akka/instrumentation/UnboundedMailboxInstrumentation.scala
new file mode 100644
index 00000000..6a335dfa
--- /dev/null
+++ b/kamon-core/src/main/scala/akka/instrumentation/UnboundedMailboxInstrumentation.scala
@@ -0,0 +1,58 @@
+/*
+ * =========================================================================================
+ * 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 org.aspectj.lang.annotation._
+import java.util.concurrent.atomic.AtomicInteger
+import org.aspectj.lang.ProceedingJoinPoint
+
+/**
+ * This aspect adds a counter to the message queue to get O(1) time in the .numberOfMessages method implementation
+ */
+@Aspect
+class UnboundedMailboxInstrumentation {
+
+  @DeclareMixin("akka.dispatch.UnboundedMailbox$MessageQueue")
+  def mixinMailboxToMailboxSizeAware: MessageQueueSizeCounting = new MessageQueueSizeCounting {}
+
+  @Pointcut("execution(* akka.dispatch.UnboundedMailbox$MessageQueue.enqueue(..)) && this(queue)")
+  def enqueuePointcut(queue: MessageQueueSizeCounting): Unit = {}
+
+  @Pointcut("execution(* akka.dispatch.UnboundedMailbox$MessageQueue.dequeue()) && this(queue)")
+  def dequeuePointcut(queue: MessageQueueSizeCounting): Unit = {}
+
+  @Pointcut("execution(* akka.dispatch.UnboundedMailbox$MessageQueue.numberOfMessages()) && this(queue)")
+  def numberOfMessagesPointcut(queue: MessageQueueSizeCounting): Unit = {}
+
+  @After("dequeuePointcut(queue)")
+  def afterDequeuePointcut(queue: MessageQueueSizeCounting): Unit = {
+    if (queue.queueSize.get() > 0) queue.queueSize.decrementAndGet()
+  }
+
+  @After("enqueuePointcut(queue)")
+  def afterEnqueue(queue: MessageQueueSizeCounting): Unit = {
+    queue.queueSize.incrementAndGet()
+  }
+
+  @Around("numberOfMessagesPointcut(queue)")
+  def aroundNumberOfMessages(pjp: ProceedingJoinPoint, queue: MessageQueueSizeCounting): Any = {
+    queue.queueSize.get()
+  }
+}
+
+trait MessageQueueSizeCounting {
+  val queueSize = new AtomicInteger
+}
-- 
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