1 files changed, 134 insertions, 0 deletions
diff --git a/kamon-core/src/legacy-main/scala/kamon/util/executors/ExecutorServiceMetrics.scala b/kamon-core/src/legacy-main/scala/kamon/util/executors/ExecutorServiceMetrics.scala
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+++ b/kamon-core/src/legacy-main/scala/kamon/util/executors/ExecutorServiceMetrics.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013-2015 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.util.executors
+
+import java.util.concurrent.{ExecutorService, ForkJoinPool ⇒ JavaForkJoinPool, ThreadPoolExecutor}
+
+import kamon.Kamon
+import kamon.metric.Entity
+
+import scala.concurrent.forkjoin.ForkJoinPool
+import scala.util.control.NoStackTrace
+
+object ExecutorServiceMetrics {
+  val Category = "executor-service"
+
+  private val DelegatedExecutor = Class.forName("java.util.concurrent.Executors$DelegatedExecutorService")
+  private val FinalizableDelegated = Class.forName("java.util.concurrent.Executors$FinalizableDelegatedExecutorService")
+  private val DelegateScheduled = Class.forName("java.util.concurrent.Executors$DelegatedScheduledExecutorService")
+  private val JavaForkJoinPool = classOf[JavaForkJoinPool]
+  private val ScalaForkJoinPool = classOf[ForkJoinPool]
+
+  private val executorField = {
+    // executorService is private :(
+    val field = DelegatedExecutor.getDeclaredField("e")
+    field.setAccessible(true)
+    field
+  }
+
+  /**
+   *
+   * Register the [[http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ThreadPoolExecutor.html ThreadPoolExecutor]] to Monitor.
+   *
+   * @param name The name of the [[ThreadPoolExecutor]]
+   * @param threadPool The intance of the [[ThreadPoolExecutor]]
+   * @param tags The tags associated to the [[ThreadPoolExecutor]]
+   */
+  @inline private def registerThreadPool(name: String, threadPool: ThreadPoolExecutor, tags: Map[String, String]): Entity = {
+    val threadPoolEntity = Entity(name, Category, tags + ("executor-type" → "thread-pool-executor"))
+    Kamon.metrics.entity(ThreadPoolExecutorMetrics.factory(threadPool, Category), threadPoolEntity)
+    threadPoolEntity
+  }
+
+  /**
+   *
+   * Register the [[http://www.scala-lang.org/api/current/index.html#scala.collection.parallel.TaskSupport ForkJoinPool]] to Monitor.
+   *
+   * @param name The name of the [[ForkJoinPool]]
+   * @param forkJoinPool The instance of the [[ForkJoinPool]]
+   * @param tags The tags associated to the [[ForkJoinPool]]
+   */
+  @inline private def registerScalaForkJoin(name: String, forkJoinPool: ForkJoinPool, tags: Map[String, String]): Entity = {
+    val forkJoinEntity = Entity(name, Category, tags + ("executor-type" → "fork-join-pool"))
+    Kamon.metrics.entity(ForkJoinPoolMetrics.factory(forkJoinPool, Category), forkJoinEntity)
+    forkJoinEntity
+  }
+
+  /**
+   *
+   * Register the [[https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html JavaForkJoinPool]] to Monitor.
+   *
+   * @param name The name of the [[JavaForkJoinPool]]
+   * @param forkJoinPool The instance of the [[JavaForkJoinPool]]
+   * @param tags The tags associated to the [[JavaForkJoinPool]]
+   */
+  @inline private def registerJavaForkJoin(name: String, forkJoinPool: JavaForkJoinPool, tags: Map[String, String]): Entity = {
+    val forkJoinEntity = Entity(name, Category, tags + ("executor-type" → "fork-join-pool"))
+    Kamon.metrics.entity(ForkJoinPoolMetrics.factory(forkJoinPool, Category), forkJoinEntity)
+    forkJoinEntity
+  }
+
+  /**
+   *
+   * Register the [[https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html ExecutorService]] to Monitor.
+   *
+   * @param name The name of the [[ExecutorService]]
+   * @param executorService The instance of the [[ExecutorService]]
+   * @param tags The tags associated to the [[ExecutorService]]
+   */
+  def register(name: String, executorService: ExecutorService, tags: Map[String, String]): Entity = executorService match {
+    case threadPoolExecutor: ThreadPoolExecutor ⇒ registerThreadPool(name, threadPoolExecutor, tags)
+    case scalaForkJoinPool: ForkJoinPool if scalaForkJoinPool.getClass.isAssignableFrom(ScalaForkJoinPool) ⇒ registerScalaForkJoin(name, scalaForkJoinPool, tags)
+    case javaForkJoinPool: JavaForkJoinPool if javaForkJoinPool.getClass.isAssignableFrom(JavaForkJoinPool) ⇒ registerJavaForkJoin(name, javaForkJoinPool, tags)
+    case delegatedExecutor: ExecutorService if delegatedExecutor.getClass.isAssignableFrom(DelegatedExecutor) ⇒ registerDelegatedExecutor(name, delegatedExecutor, tags)
+    case delegatedScheduledExecutor: ExecutorService if delegatedScheduledExecutor.getClass.isAssignableFrom(DelegateScheduled) ⇒ registerDelegatedExecutor(name, delegatedScheduledExecutor, tags)
+    case finalizableDelegatedExecutor: ExecutorService if finalizableDelegatedExecutor.getClass.isAssignableFrom(FinalizableDelegated) ⇒ registerDelegatedExecutor(name, finalizableDelegatedExecutor, tags)
+    case other ⇒ throw NotSupportedException(s"The ExecutorService $name is not supported.")
+  }
+
+  //Java variant
+  def register(name: String, executorService: ExecutorService, tags: java.util.Map[String, String]): Entity = {
+    import scala.collection.JavaConverters._
+    register(name, executorService, tags.asScala.toMap)
+  }
+
+  /**
+   *
+   * Register the [[https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html ExecutorService]] to Monitor.
+   *
+   * @param name The name of the [[ExecutorService]]
+   * @param executorService The instance of the [[ExecutorService]]
+   */
+  def register(name: String, executorService: ExecutorService): Entity = {
+    register(name, executorService, Map.empty[String, String])
+  }
+
+  def remove(entity: Entity): Unit = Kamon.metrics.removeEntity(entity)
+
+  /**
+   * INTERNAL USAGE ONLY
+   */
+  private def registerDelegatedExecutor(name: String, executor: ExecutorService, tags: Map[String, String]) = {
+    val underlyingExecutor = executorField.get(executor) match {
+      case executorService: ExecutorService ⇒ executorService
+      case other                            ⇒ other
+    }
+    register(name, underlyingExecutor.asInstanceOf[ExecutorService], tags)
+  }
+
+  case class NotSupportedException(message: String) extends RuntimeException with NoStackTrace
+}
+\ No newline at end of file