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/*
* =========================================================================================
* Copyright © 2013-2014 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.trace.logging
import kamon.trace.TraceLocal.AvailableToMdc
import kamon.trace.{ EmptyTraceContext, MetricsOnlyContext, TraceContext }
import org.slf4j.MDC
trait MdcKeysSupport {
def withMdc[A](thunk: ⇒ A): A = {
val keys = copyToMdc(TraceContext.currentContext)
try thunk finally keys.foreach(key ⇒ MDC.remove(key))
}
private[this] def copyToMdc(traceContext: TraceContext): Iterable[String] = traceContext match {
case ctx: MetricsOnlyContext ⇒
ctx.traceLocalStorage.underlyingStorage.collect {
case (available: AvailableToMdc, value) ⇒ Map(available.mdcKey -> String.valueOf(value))
}.map { value ⇒ value.map { case (k, v) ⇒ MDC.put(k, v); k } }.flatten
case EmptyTraceContext ⇒ Iterable.empty[String]
}
}
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