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/*
* =========================================================================================
* Copyright © 2013-2015 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.util
import scala.collection.concurrent.TrieMap
object TriemapAtomicGetOrElseUpdate {
/**
* Workaround to the non thread-safe [[scala.collection.concurrent.TrieMap#getOrElseUpdate]] method. More details on
* why this is necessary can be found at [[https://issues.scala-lang.org/browse/SI-7943]].
*/
implicit class Syntax[K, V](val trieMap: TrieMap[K, V]) extends AnyVal {
def atomicGetOrElseUpdate(key: K, op: ⇒ V): V =
atomicGetOrElseUpdate(key, op, { v: V ⇒ Unit })
def atomicGetOrElseUpdate(key: K, op: ⇒ V, cleanup: V ⇒ Unit): V =
trieMap.get(key) match {
case Some(v) ⇒ v
case None ⇒
val d = op
trieMap.putIfAbsent(key, d).map { oldValue ⇒
// If there was an old value then `d` was never added
// and thus need to be cleanup.
cleanup(d)
oldValue
} getOrElse (d)
}
}
}
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