1 files changed, 146 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metric/Metrics.scala b/kamon-core/src/main/scala/kamon/metric/Metrics.scala
new file mode 100644
index 00000000..cdc0a334
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/metric/Metrics.scala
@@ -0,0 +1,146 @@
+package kamon.metric
+
+import java.util.concurrent.{ConcurrentHashMap, ConcurrentSkipListSet, TimeUnit}
+import akka.actor.ActorRef
+import com.codahale.metrics
+import com.codahale.metrics.{MetricFilter, Metric, ConsoleReporter, MetricRegistry}
+
+
+object Metrics {
+  val registry: MetricRegistry = new MetricRegistry
+
+  val consoleReporter = ConsoleReporter.forRegistry(registry).convertDurationsTo(TimeUnit.NANOSECONDS)
+  //consoleReporter.build().start(45, TimeUnit.SECONDS)
+
+  //val newrelicReporter = NewRelicReporter(registry)
+  //newrelicReporter.start(5, TimeUnit.SECONDS)
+
+  def include(name: String, metric: Metric) = {
+    //registry.register(name, metric)
+  }
+
+  def exclude(name: String) = {
+    registry.removeMatching(new MetricFilter {
+      def matches(name: String, metric: Metric): Boolean = name.startsWith(name)
+    })
+  }
+
+
+
+  def deregister(fullName: String) = {
+    registry.removeMatching(new MetricFilter {
+      def matches(name: String, metric: Metric): Boolean = name.startsWith(fullName)
+    })
+  }
+}
+
+object Watched {
+  case object Actor
+  case object Dispatcher
+}
+
+object MetricDirectory {
+  def nameForDispatcher(actorSystem: String, dispatcher: String) = s"/ActorSystem/${actorSystem}/Dispatcher/${dispatcher}/"
+
+  def nameForMailbox(actorSystem: String, actor: String) = s"/ActorSystem/$actorSystem/Actor/$actor/Mailbox"
+
+  def nameForActor(actorRef: ActorRef) = actorRef.path.elements.mkString("/")
+
+  def shouldInstrument(actorSystem: String): Boolean = !actorSystem.startsWith("kamon")
+
+
+  def shouldInstrumentActor(actorPath: String): Boolean = {
+    !(actorPath.isEmpty || actorPath.startsWith("system"))
+  }
+
+
+}
+
+
+
+
+
+
+
+
+
+
+
+
+case class DispatcherMetricCollector(activeThreadCount: Histogram, poolSize: Histogram, queueSize: Histogram)
+
+
+
+
+trait Histogram {
+  def update(value: Long): Unit
+  def snapshot: HistogramSnapshot
+}
+
+trait HistogramSnapshot {
+  def median: Double
+  def max: Double
+  def min: Double
+}
+
+
+case class ActorSystemMetrics(actorSystemName: String) {
+  import scala.collection.JavaConverters._
+  val dispatchers = new ConcurrentHashMap[String, DispatcherMetricCollector] asScala
+
+  private[this] def createDispatcherCollector: DispatcherMetricCollector = DispatcherMetricCollector(CodahaleHistogram(), CodahaleHistogram(), CodahaleHistogram())
+
+  def registerDispatcher(dispatcherName: String): Option[DispatcherMetricCollector] = {
+    val stats = createDispatcherCollector
+    dispatchers.put(dispatcherName, stats)
+    Some(stats)
+  }
+
+}
+
+
+case class CodahaleHistogram() extends Histogram {
+  private[this] val histogram = new com.codahale.metrics.Histogram(new metrics.ExponentiallyDecayingReservoir())
+
+  def update(value: Long) = histogram.update(value)
+  def snapshot: HistogramSnapshot = {
+    val snapshot = histogram.getSnapshot
+
+    CodahaleHistogramSnapshot(snapshot.getMedian, snapshot.getMax, snapshot.getMin)
+  }
+}
+
+case class CodahaleHistogramSnapshot(median: Double, max: Double, min: Double) extends HistogramSnapshot
+
+
+
+
+
+
+
+/**
+ *  Dispatcher Metrics that we care about currently with a histogram-like nature:
+ *    - Work Queue Size
+ *    - Total/Active Thread Count
+ */
+
+
+
+import annotation.tailrec
+import java.util.concurrent.atomic.AtomicReference
+
+object Atomic {
+  def apply[T]( obj : T) = new Atomic(new AtomicReference(obj))
+  implicit def toAtomic[T]( ref : AtomicReference[T]) : Atomic[T] = new Atomic(ref)
+}
+
+class Atomic[T](val atomic : AtomicReference[T]) {
+  @tailrec
+  final def update(f: T => T) : T = {
+    val oldValue = atomic.get()
+    val newValue = f(oldValue)
+    if (atomic.compareAndSet(oldValue, newValue)) newValue else update(f)
+  }
+
+  def get() = atomic.get()
+}
+\ No newline at end of file