1 files changed, 97 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/akka/instrumentation/DispatcherTracing.scala b/kamon-core/src/main/scala/akka/instrumentation/DispatcherTracing.scala
new file mode 100644
index 00000000..63e96fa0
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+++ b/kamon-core/src/main/scala/akka/instrumentation/DispatcherTracing.scala
@@ -0,0 +1,97 @@
+/*
+ * =========================================================================================
+ * 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 akka.dispatch.{ Dispatcher, MessageDispatcher }
+import kamon.metrics.{ Metrics, DispatcherMetrics }
+import kamon.metrics.DispatcherMetrics.DispatcherMetricRecorder
+import kamon.Kamon
+import akka.actor.{ Cancellable, ActorSystemImpl }
+import kamon.metrics.dispatcher.DispatcherMetricsCollector
+
+@Aspect
+class DispatcherTracing {
+
+  private[this] var actorSystem: ActorSystemImpl = _
+
+  @Pointcut("execution(akka.actor.ActorSystemImpl.new(..)) && this(system)")
+  def onActorSystemStartup(system: ActorSystemImpl) = {}
+
+  @Before("onActorSystemStartup(system)")
+  def beforeActorSystemStartup(system: ActorSystemImpl): Unit = {
+    actorSystem = system
+  }
+
+  @Pointcut("call(* akka.dispatch.ExecutorServiceFactory.createExecutorService(..))")
+  def onCreateExecutorService(): Unit = {}
+
+  @Pointcut("cflow((execution(* akka.dispatch.MessageDispatcher.registerForExecution(..)) || execution(* akka.dispatch.MessageDispatcher.executeTask(..))) && this(dispatcher))")
+  def onCflowMessageDispatcher(dispatcher: Dispatcher): Unit = {}
+
+  @Pointcut("onCreateExecutorService() && onCflowMessageDispatcher(dispatcher)")
+  def onDispatcherStartup(dispatcher: Dispatcher): Unit = {}
+
+  @After("onDispatcherStartup(dispatcher)")
+  def afterDispatcherStartup(dispatcher: MessageDispatcher): Unit = {
+
+    val metricsExtension = Kamon(Metrics)(actorSystem)
+    val metricIdentity = DispatcherMetrics(dispatcher.id)
+    val dispatcherWithMetrics = dispatcher.asInstanceOf[DispatcherMessageMetrics]
+
+    dispatcherWithMetrics.metricIdentity = metricIdentity
+    dispatcherWithMetrics.dispatcherMetricsRecorder = metricsExtension.register(metricIdentity, DispatcherMetrics.Factory)
+
+    if (dispatcherWithMetrics.dispatcherMetricsRecorder.isDefined) {
+      dispatcherWithMetrics.dispatcherCollectorCancellable = metricsExtension.scheduleGaugeRecorder {
+        dispatcherWithMetrics.dispatcherMetricsRecorder.map {
+          dm ⇒
+            val (maximumPoolSize, runningThreadCount, queueTaskCount, poolSize) = DispatcherMetricsCollector.collect(dispatcher)
+
+            dm.maximumPoolSize.record(maximumPoolSize)
+            dm.runningThreadCount.record(runningThreadCount)
+            dm.queueTaskCount.record(queueTaskCount)
+            dm.poolSize.record(poolSize)
+        }
+      }
+    }
+  }
+
+  @Pointcut("execution(* akka.dispatch.MessageDispatcher.shutdown(..)) && this(dispatcher)")
+  def onDispatcherShutdown(dispatcher: MessageDispatcher): Unit = {}
+
+  @After("onDispatcherShutdown(dispatcher)")
+  def afterDispatcherShutdown(dispatcher: MessageDispatcher): Unit = {
+    val dispatcherWithMetrics = dispatcher.asInstanceOf[DispatcherMessageMetrics]
+    dispatcherWithMetrics.dispatcherCollectorCancellable.cancel()
+    Kamon(Metrics)(actorSystem).unregister(dispatcherWithMetrics.metricIdentity)
+  }
+}
+
+@Aspect
+class DispatcherMetricsMixin {
+
+  @DeclareMixin("akka.dispatch.Dispatcher")
+  def mixinDispatcherMetricsToMessageDispatcher: DispatcherMessageMetrics = new DispatcherMessageMetrics {}
+}
+
+trait DispatcherMessageMetrics {
+  var metricIdentity: DispatcherMetrics = _
+  var dispatcherMetricsRecorder: Option[DispatcherMetricRecorder] = _
+  var dispatcherCollectorCancellable: Cancellable = _
+}
+