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/* =========================================================================================
* Copyright © 2013-2018 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.context
trait Storage {
def current(): Context
def store(context: Context): Storage.Scope
}
object Storage {
trait Scope {
def context: Context
def close(): Unit
}
class ThreadLocal extends Storage {
private val tls = new java.lang.ThreadLocal[Context]() {
override def initialValue(): Context = Context.Empty
}
override def current(): Context =
tls.get()
override def store(context: Context): Scope = {
val newContext = context
val previousContext = tls.get()
tls.set(newContext)
new Scope {
override def context: Context = newContext
override def close(): Unit = tls.set(previousContext)
}
}
}
object ThreadLocal {
def apply(): ThreadLocal = new ThreadLocal()
}
}
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