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package kamon.instrumentation
import com.codahale.metrics.{ExponentiallyDecayingReservoir, Histogram}
import akka.dispatch.{UnboundedMessageQueueSemantics, 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 {
val systemName = sys.name
val ownerName = MetricDirectory.nameForActor(own)
val mailBoxName = MetricDirectory.nameForMailbox(systemName, ownerName)
val queueSizeHistogram = new Histogram(new ExponentiallyDecayingReservoir())
Metrics.include(mailBoxName, queueSizeHistogram)
new MonitoredMessageQueue(delegate, queueSizeHistogram)
}
monitoredMailbox match {
case None => delegate
case Some(mmb) => mmb
}
}
}
class MonitoredMessageQueue(val delegate: MessageQueue, val queueSizeHistogram: Histogram) extends MessageQueue with UnboundedMessageQueueSemantics{
def enqueue(receiver: ActorRef, handle: Envelope) = {
delegate.enqueue(receiver, handle)
queueSizeHistogram.update(numberOfMessages)
}
def dequeue(): Envelope = {
val envelope = delegate.dequeue()
queueSizeHistogram.update(numberOfMessages)
envelope
}
def numberOfMessages: Int = delegate.numberOfMessages
def hasMessages: Boolean = delegate.hasMessages
def cleanUp(owner: ActorRef, deadLetters: MessageQueue) = delegate.cleanUp(owner, deadLetters)
}
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