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/* ===================================================
* Copyright © 2013 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 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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