introduce selective instrumentation for akka actors.

1 files changed, 31 insertions, 0 deletions

diff --git a/kamon-akka/src/main/scala/kamon/akka/instrumentation/CellInfo.scala b/kamon-akka/src/main/scala/kamon/akka/instrumentation/CellInfo.scala
new file mode 100644
index 00000000..e144e605
--- /dev/null
+++ b/kamon-akka/src/main/scala/kamon/akka/instrumentation/CellInfo.scala
@@ -0,0 +1,31 @@
+package akka.kamon.instrumentation
+
+import akka.actor.{ Cell, ActorRef, ActorSystem }
+import akka.routing.{ RoutedActorRef, RoutedActorCell }
+import kamon.Kamon
+import kamon.akka.{ ActorMetrics, RouterMetrics }
+import kamon.metric.Entity
+
+case class CellInfo(entity: Entity, isRouter: Boolean, isRoutee: Boolean, isTracked: Boolean)
+
+object CellInfo {
+
+  def cellName(system: ActorSystem, ref: ActorRef): String =
+    system.name + "/" + ref.path.elements.mkString("/")
+
+  def cellInfoFor(cell: Cell, system: ActorSystem, ref: ActorRef, parent: ActorRef): CellInfo = {
+    import kamon.metric.Entity
+
+    val pathString = ref.path.elements.mkString("/")
+    val isRootSupervisor = pathString.length == 0 || pathString == "user" || pathString == "system"
+    val isRouter = cell.isInstanceOf[RoutedActorCell]
+    val isRoutee = parent.isInstanceOf[RoutedActorRef]
+
+    val name = if (isRoutee) cellName(system, parent) else cellName(system, ref)
+    val category = if (isRouter || isRoutee) RouterMetrics.category else ActorMetrics.category
+    val entity = Entity(name, category)
+    val isTracked = !isRootSupervisor && Kamon.metrics.shouldTrack(entity)
+
+    CellInfo(entity, isRouter, isRoutee, isTracked)
+  }
+}
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