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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.akka

import com.typesafe.config.Config
import kamon.Kamon

object AkkaExtension {
  private val akkaConfig = Kamon.config.getConfig("kamon.akka")

  val askPatternTimeoutWarning = AskPatternTimeoutWarningSettings.fromConfig(akkaConfig)
  val traceContextPropagation = TraceContextPropagationSettings.fromConfig(akkaConfig)
}

sealed trait AskPatternTimeoutWarningSetting
object AskPatternTimeoutWarningSettings {
  case object Off extends AskPatternTimeoutWarningSetting
  case object Lightweight extends AskPatternTimeoutWarningSetting
  case object Heavyweight extends AskPatternTimeoutWarningSetting

  def fromConfig(config: Config): AskPatternTimeoutWarningSetting =
    config.getString("ask-pattern-timeout-warning") match {
      case "off"          Off
      case "lightweight"  Lightweight
      case "heavyweight"  Heavyweight
      case other          sys.error(s"Unrecognized option [$other] for the kamon.akka.ask-pattern-timeout-warning config.")
    }
}

sealed trait TraceContextPropagationSetting
object TraceContextPropagationSettings {
  case object Off extends TraceContextPropagationSetting
  case object MonitoredActorsOnly extends TraceContextPropagationSetting
  case object Always extends TraceContextPropagationSetting

  def fromConfig(config: Config): TraceContextPropagationSetting =
    config.getString("automatic-trace-context-propagation") match {
      case "off"                    Off
      case "monitored-actors-only"  MonitoredActorsOnly
      case "always"                 Always
      case other                    sys.error(s"Unrecognized option [$other] for the kamon.akka.automatic-trace-context-propagation config.")
    }
}