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(): CounterRecorder = new CounterRecorder()
}