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/*
* =========================================================================================
* 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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