diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metric/package.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metric/package.scala | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metric/package.scala b/kamon-core/src/main/scala/kamon/metric/package.scala new file mode 100644 index 00000000..43166058 --- /dev/null +++ b/kamon-core/src/main/scala/kamon/metric/package.scala @@ -0,0 +1,34 @@ +/* + * ========================================================================================= + * Copyright © 2013 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 + +import scala.annotation.tailrec +import com.typesafe.config.Config + +package object metric { + + @tailrec def combineMaps[K, V](left: Map[K, V], right: Map[K, V])(valueMerger: (V, V) ⇒ V): Map[K, V] = { + if (right.isEmpty) + left + else { + val (key, rightValue) = right.head + val value = left.get(key).map(valueMerger(_, rightValue)).getOrElse(rightValue) + + combineMaps(left.updated(key, value), right.tail)(valueMerger) + } + } +} |