+ core: provide metrics for routers

* processing-time
* errors
* time-in-mailbox
closes #62

1 files changed, 85 insertions, 0 deletions

diff --git a/kamon-core/src/main/scala/kamon/metric/RouterMetrics.scala b/kamon-core/src/main/scala/kamon/metric/RouterMetrics.scala
new file mode 100644
index 00000000..adb2a18b
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/metric/RouterMetrics.scala
@@ -0,0 +1,85 @@
+/*
+ * =========================================================================================
+ * 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 kamon.metric
+
+import akka.actor.ActorSystem
+import com.typesafe.config.Config
+<<<<<<< Updated upstream
+import kamon.metric.instrument.{ Counter, Histogram }
+=======
+import kamon.metric.instrument.{Counter, Histogram}
+>>>>>>> Stashed changes
+
+case class RouterMetrics(name: String) extends MetricGroupIdentity {
+  val category = RouterMetrics
+}
+
+object RouterMetrics extends MetricGroupCategory {
+  val name = "router"
+
+  case object ProcessingTime extends MetricIdentity { val name = "processing-time" }
+  case object TimeInMailbox extends MetricIdentity { val name = "time-in-mailbox" }
+  case object Errors extends MetricIdentity { val name = "errors" }
+
+  case class RouterMetricsRecorder(processingTime: Histogram, timeInMailbox: Histogram, errors: Counter) extends MetricGroupRecorder {
+
+    def collect(context: CollectionContext): RouterMetricSnapshot =
+      RouterMetricSnapshot(processingTime.collect(context), timeInMailbox.collect(context), errors.collect(context))
+
+    def cleanup: Unit = {
+      processingTime.cleanup
+      timeInMailbox.cleanup
+      errors.cleanup
+    }
+  }
+
+  case class RouterMetricSnapshot(processingTime: Histogram.Snapshot, timeInMailbox: Histogram.Snapshot,
+<<<<<<< Updated upstream
+      errors: Counter.Snapshot) extends MetricGroupSnapshot {
+=======
+                                 errors: Counter.Snapshot) extends MetricGroupSnapshot {
+>>>>>>> Stashed changes
+
+    type GroupSnapshotType = RouterMetricSnapshot
+
+    def merge(that: RouterMetricSnapshot, context: CollectionContext): RouterMetricSnapshot =
+      RouterMetricSnapshot(
+        processingTime.merge(that.processingTime, context),
+        timeInMailbox.merge(that.timeInMailbox, context),
+        errors.merge(that.errors, context))
+
+    lazy val metrics: Map[MetricIdentity, MetricSnapshot] = Map(
+      ProcessingTime -> processingTime,
+      TimeInMailbox -> timeInMailbox,
+      Errors -> errors)
+  }
+
+  val Factory = new MetricGroupFactory {
+    type GroupRecorder = RouterMetricsRecorder
+
+    def create(config: Config, system: ActorSystem): RouterMetricsRecorder = {
+      val settings = config.getConfig("precision.router")
+
+      val processingTimeConfig = settings.getConfig("processing-time")
+      val timeInMailboxConfig = settings.getConfig("time-in-mailbox")
+
+      new RouterMetricsRecorder(
+        Histogram.fromConfig(processingTimeConfig),
+        Histogram.fromConfig(timeInMailboxConfig),
+        Counter())
+    }
+  }
+}