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package kamon.metrics.dispatcher
/*
* =========================================================================================
* 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.
* =========================================================================================
*/
import scala.concurrent.forkjoin.ForkJoinPool
import java.util.concurrent.ThreadPoolExecutor
import akka.dispatch.{ExecutorServiceDelegate, Dispatcher, MessageDispatcher}
import java.lang.reflect.Method
object DispatcherMetricsCollector {
private[this] type DispatcherMetrics = (Long, Long, Long, Long)
private[this] def collectForkJoinMetrics(pool: ForkJoinPool):DispatcherMetrics = {
(pool.getParallelism, pool.getActiveThreadCount, (pool.getQueuedTaskCount + pool.getQueuedSubmissionCount), pool.getPoolSize)
}
private[this] def collectExecutorMetrics(pool: ThreadPoolExecutor):DispatcherMetrics = {
(pool.getMaximumPoolSize, pool.getActiveCount, pool.getQueue.size(), pool.getPoolSize)
}
private[this] val executorServiceMethod: Method = {
// executorService is protected
val method = classOf[Dispatcher].getDeclaredMethod("executorService")
method.setAccessible(true)
method
}
def collect(dispatcher: MessageDispatcher): (Long, Long, Long, Long) = {
dispatcher match {
case x: Dispatcher ⇒ {
val executor = executorServiceMethod.invoke(x) match {
case delegate: ExecutorServiceDelegate ⇒ delegate.executor
case other ⇒ other
}
executor match {
case fjp: ForkJoinPool ⇒ collectForkJoinMetrics(fjp)
case tpe: ThreadPoolExecutor ⇒ collectExecutorMetrics(tpe)
case anything ⇒ (0L, 0L, 0L, 0L)
}
}
case _ ⇒ new DispatcherMetrics(0L, 0L, 0L, 0L)
}
}
}
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