1 files changed, 18 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala b/kamon-core/src/main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala
new file mode 100644
index 00000000..cd457cdc
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/util/TriemapAtomicGetOrElseUpdate.scala
@@ -0,0 +1,18 @@
+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 =
+      trieMap.get(key) match {
+        case Some(v) ⇒ v
+        case None    ⇒ val d = op; trieMap.putIfAbsent(key, d).getOrElse(d)
+      }
+  }
+}