1 files changed, 48 insertions, 0 deletions
diff --git a/kamon-system-metrics/src/main/scala/kamon/system/jmx/ClassLoadingMetrics.scala b/kamon-system-metrics/src/main/scala/kamon/system/jmx/ClassLoadingMetrics.scala
new file mode 100644
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+++ b/kamon-system-metrics/src/main/scala/kamon/system/jmx/ClassLoadingMetrics.scala
@@ -0,0 +1,48 @@
+/*
+ * =========================================================================================
+ * 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.system.jmx
+
+import java.lang.management.ManagementFactory
+
+import kamon.metric.GenericEntityRecorder
+import kamon.metric.instrument.{ Memory, InstrumentFactory }
+
+/**
+ *  Class Loading metrics, as reported by JMX:
+ *    - @see [[http://docs.oracle.com/javase/7/docs/api/java/lang/management/ClassLoadingMXBean.html "ClassLoadingMXBean"]]
+ */
+class ClassLoadingMetrics(instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) {
+  val classLoadingBean = ManagementFactory.getClassLoadingMXBean
+
+  gauge("classes-loaded", Memory.Bytes, () ⇒ {
+    classLoadingBean.getTotalLoadedClassCount
+  })
+
+  gauge("classes-unloaded", Memory.Bytes, () ⇒ {
+    classLoadingBean.getUnloadedClassCount
+  })
+
+  gauge("classes-currently-loaded", Memory.Bytes, () ⇒ {
+    classLoadingBean.getLoadedClassCount.toLong
+  })
+
+}
+
+object ClassLoadingMetrics extends JmxSystemMetricRecorderCompanion("class-loading") {
+  def apply(instrumentFactory: InstrumentFactory): ClassLoadingMetrics =
+    new ClassLoadingMetrics(instrumentFactory)
+}