diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metric/AtomicLongMaxUpdater.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metric/AtomicLongMaxUpdater.scala | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metric/AtomicLongMaxUpdater.scala b/kamon-core/src/main/scala/kamon/metric/AtomicLongMaxUpdater.scala new file mode 100644 index 00000000..14e45631 --- /dev/null +++ b/kamon-core/src/main/scala/kamon/metric/AtomicLongMaxUpdater.scala @@ -0,0 +1,40 @@ +/* ========================================================================================= + * 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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