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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
import scala.annotation.tailrec
class AtomicLongMaxUpdater(value:AtomicLong) {
def update(newMax:Long):Unit = {
@tailrec def compare():Long = {
val currentMax = value.get()
if(newMax > currentMax) if (!value.compareAndSet(currentMax, newMax)) compare() else newMax
else currentMax
}
compare()
}
def maxThenReset(newValue:Long): Long =
value.getAndSet(newValue)
}
object AtomicLongMaxUpdater {
def apply(): AtomicLongMaxUpdater =
new AtomicLongMaxUpdater(new AtomicLong(0))
}
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