kamon-core/src/main/scala/kamon/trace/logging/LogbackTraceTokenConverter.scala


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/* ===================================================
 * 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.trace.logging

import ch.qos.logback.classic.pattern.ClassicConverter
import ch.qos.logback.classic.spi.ILoggingEvent
import kamon.trace.TraceContext

class LogbackTraceTokenConverter extends ClassicConverter {
  def convert(event: ILoggingEvent): String = {
    val ctx = TraceContext.currentContext
    if (ctx.isEmpty)
      "undefined"
    else
      ctx.token
  }
}