1 files changed, 71 insertions, 0 deletions
diff --git a/src/main/scala/akka/instrumentation/MessageQueueMetrics.scala b/src/main/scala/akka/instrumentation/MessageQueueMetrics.scala
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+++ b/src/main/scala/akka/instrumentation/MessageQueueMetrics.scala
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+package akka.instrumentation
+
+import com.codahale.metrics.{ExponentiallyDecayingReservoir, Histogram}
+import akka.dispatch.{Envelope, MessageQueue}
+import org.aspectj.lang.annotation.{Around, Pointcut, DeclareMixin, Aspect}
+import akka.actor.{ActorSystem, ActorRef}
+import kamon.metric.{Metrics, MetricDirectory}
+import org.aspectj.lang.ProceedingJoinPoint
+
+
+/**
+ *  For Mailboxes we would like to track the queue size and message latency. Currently the latency
+ *  will be gathered from the ActorCellMetrics.
+ */
+
+
+@Aspect
+class MessageQueueInstrumentation {
+
+  @Pointcut("execution(* akka.dispatch.MailboxType+.create(..)) && args(owner, system)")
+  def messageQueueCreation(owner: Option[ActorRef], system: Option[ActorSystem]) = {}
+
+  @Around("messageQueueCreation(owner, system)")
+  def wrapMessageQueue(pjp: ProceedingJoinPoint, owner: Option[ActorRef], system: Option[ActorSystem]): MessageQueue = {
+    val delegate = pjp.proceed.asInstanceOf[MessageQueue]
+
+    // We are not interested in monitoring mailboxes if we don't know where they belong to.
+    val monitoredMailbox = for(own <- owner; sys <- system) yield new MonitoredMessageQueue(delegate, own, sys)
+
+    monitoredMailbox match {
+      case None => delegate
+      case Some(mmb) => mmb
+    }
+
+  }
+}
+
+
+class MonitoredMessageQueue(val delegate: MessageQueue, owner: ActorRef, system: ActorSystem) extends MessageQueue {
+  val queueSizeHistogram: Histogram = new Histogram(new ExponentiallyDecayingReservoir)
+
+  val fullName = MetricDirectory.nameForMailbox(system.name, MetricDirectory.nameForActor(owner))
+  Metrics.registry.register(fullName, queueSizeHistogram)
+
+  def enqueue(receiver: ActorRef, handle: Envelope) = {
+    queueSizeHistogram.update(numberOfMessages)
+    delegate.enqueue(receiver, handle)
+  }
+
+  def dequeue(): Envelope = {
+    queueSizeHistogram.update(numberOfMessages)
+    delegate.dequeue()
+  }
+
+  def numberOfMessages: Int = delegate.numberOfMessages
+  def hasMessages: Boolean = delegate.hasMessages
+  def cleanUp(owner: ActorRef, deadLetters: MessageQueue) = {
+    Metrics.deregister(fullName)
+
+    delegate.cleanUp(owner, deadLetters)
+  }
+}
+
+
+
+
+
+
+
+
+