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/* =========================================================================================
* Copyright © 2013-2017 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 java.util.concurrent.atomic.AtomicLong
trait Gauge {
def unit: MeasurementUnit
def increment(): Unit
def increment(times: Long): Unit
def decrement(): Unit
def decrement(times: Long): Unit
def set(value: Long): Unit
}
class AtomicLongGauge(name: String, tags: Map[String, String], val unit: MeasurementUnit) extends Gauge {
private val currentValue = new AtomicLong(0L)
def increment(): Unit =
currentValue.incrementAndGet()
def increment(times: Long): Unit =
currentValue.addAndGet(times)
def decrement(): Unit =
currentValue.decrementAndGet()
def decrement(times: Long): Unit =
currentValue.addAndGet(-times)
def set(value: Long): Unit =
currentValue.set(value)
// Gauges never reset internal state, the resetSate parameter is always ignored.
def snapshot(): MetricValue =
MetricValue(name, tags, unit, currentValue.get())
}
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