1 files changed, 85 insertions, 0 deletions
diff --git a/kamon-system-metrics/src/main/scala/kamon/metrics/ThreadMetrics.scala b/kamon-system-metrics/src/main/scala/kamon/metrics/ThreadMetrics.scala
new file mode 100644
index 00000000..fc039ffa
--- /dev/null
+++ b/kamon-system-metrics/src/main/scala/kamon/metrics/ThreadMetrics.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.metrics
+
+import java.lang.management.ManagementFactory
+
+import akka.actor.ActorSystem
+import com.typesafe.config.Config
+import kamon.metric._
+import kamon.metric.instrument.{ Gauge, Histogram }
+
+case class ThreadMetrics(name: String) extends MetricGroupIdentity {
+  val category = ThreadMetrics
+}
+
+object ThreadMetrics extends MetricGroupCategory {
+  val name = "thread"
+
+  case object Damon extends MetricIdentity { val name = "daemon-count" }
+  case object Count extends MetricIdentity { val name = "count" }
+  case object Peak extends MetricIdentity { val name = "peak-count" }
+
+  case class ThreadMetricRecorder(daemon: Gauge, count: Gauge, peak: Gauge)
+      extends MetricGroupRecorder {
+
+    def collect(context: CollectionContext): MetricGroupSnapshot = {
+      ThreadMetricSnapshot(daemon.collect(context), count.collect(context), peak.collect(context))
+    }
+
+    def cleanup: Unit = {}
+  }
+
+  case class ThreadMetricSnapshot(daemon: Histogram.Snapshot, count: Histogram.Snapshot, peak: Histogram.Snapshot)
+      extends MetricGroupSnapshot {
+
+    type GroupSnapshotType = ThreadMetricSnapshot
+
+    def merge(that: GroupSnapshotType, context: CollectionContext): GroupSnapshotType = {
+      ThreadMetricSnapshot(daemon.merge(that.daemon, context), count.merge(that.count, context), peak.merge(that.peak, context))
+    }
+
+    lazy val metrics: Map[MetricIdentity, MetricSnapshot] = Map(
+      Damon -> daemon,
+      Count -> count,
+      Peak -> peak)
+  }
+
+  val Factory = ThreadMetricGroupFactory
+}
+
+case object ThreadMetricGroupFactory extends MetricGroupFactory {
+
+  import ThreadMetrics._
+
+  def threads = ManagementFactory.getThreadMXBean
+
+  type GroupRecorder = ThreadMetricRecorder
+
+  def create(config: Config, system: ActorSystem): GroupRecorder = {
+    val settings = config.getConfig("precision.jvm.thread")
+
+    val daemonThreadConfig = settings.getConfig("daemon")
+    val countThreadsConfig = settings.getConfig("count")
+    val peakThreadsConfig = settings.getConfig("peak")
+
+    new ThreadMetricRecorder(
+      Gauge.fromConfig(daemonThreadConfig, system)(() ⇒ threads.getDaemonThreadCount.toLong),
+      Gauge.fromConfig(countThreadsConfig, system)(() ⇒ threads.getThreadCount.toLong),
+      Gauge.fromConfig(peakThreadsConfig, system)(() ⇒ threads.getPeakThreadCount.toLong))
+  }
+}
+