! core: new counter recorder based on LongAdder

1 files changed, 36 insertions, 0 deletions

diff --git a/kamon-core/src/main/scala/kamon/metrics/instruments/CounterRecorder.scala b/kamon-core/src/main/scala/kamon/metrics/instruments/CounterRecorder.scala
new file mode 100644
index 00000000..1ab743d2
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/metrics/instruments/CounterRecorder.scala
@@ -0,0 +1,36 @@
+package kamon.metrics.instruments
+/*
+ * =========================================================================================
+ * 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.
+ * =========================================================================================
+ */
+
+import kamon.metrics._
+import kamon.metrics.MetricSnapshot.Measurement
+
+import jsr166e.LongAdder
+
+class CounterRecorder extends MetricRecorder {
+  private val counter = new LongAdder
+
+  def record(value: Long): Unit = counter.add(value)
+
+  def collect(): MetricSnapshotLike = {
+    val sum = counter.sumThenReset()
+    MetricSnapshot(InstrumentTypes.Counter, sum, Scale.Unit, Vector(Measurement(1, sum)))
+  }
+}
+
+object CounterRecorder {
+  def apply() = new CounterRecorder
+}
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