deploymentzone.actor.domain.NamespaceTransformer.scala Maven / Gradle / Ivy

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package deploymentzone.actor.domain

import deploymentzone.actor.Metric
import deploymentzone.actor.validation.StatsDBucketValidator

/**
 * Transforms the toString result value of a CounterMessage instance to include an
 * optional namespace.
 */
private[actor] class NamespaceTransformer(val namespace: String) extends ((Metric[_]) => String) {

  require(StatsDBucketValidator(namespace))

  override def apply(counter: Metric[_]): String = {
    require(counter != null)

    val intermediate = counter.toString
    namespace match {
      case null => intermediate
      case "" => intermediate
      case _ => s"$namespace.$intermediate"
    }
  }
}

private[actor] object NamespaceTransformer {
  def apply(namespace: String) = new NamespaceTransformer(namespace)
}