/* ===================================================
 * 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.instrumentation

import org.aspectj.lang.annotation.{Around, Pointcut, DeclareMixin, Aspect}
import org.aspectj.lang.ProceedingJoinPoint
import org.slf4j.MDC
import kamon.trace.{TraceContext, ContextAware, Trace}

@Aspect
class ActorLoggingTracing {

  @DeclareMixin("akka.event.Logging.LogEvent+")
  def mixin: ContextAware = ContextAware.default

  @Pointcut("execution(* akka.event.slf4j.Slf4jLogger.withMdc(..)) && args(logSource, logEvent, logStatement)")
  def withMdcInvocation(logSource: String, logEvent: ContextAware, logStatement: () => _): Unit = {}

  @Around("withMdcInvocation(logSource, logEvent, logStatement)")
  def aroundWithMdcInvocation(pjp: ProceedingJoinPoint, logSource: String, logEvent: ContextAware, logStatement: () => _): Unit = {
    logEvent.traceContext match {
      case Some(ctx) =>
        MDC.put("uow", ctx.uow)
        pjp.proceed()
        MDC.remove("uow")

      case None => pjp.proceed()
    }
  }
}