diff options
Diffstat (limited to 'kamon-core/src/legacy-main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala')
-rw-r--r-- | kamon-core/src/legacy-main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/kamon-core/src/legacy-main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala b/kamon-core/src/legacy-main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala new file mode 100644 index 00000000..d1197a5a --- /dev/null +++ b/kamon-core/src/legacy-main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala @@ -0,0 +1,45 @@ +/* + * ========================================================================================= + * 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) + } + } +} |