apply_method.scala

def apply(input: String): String = {
    val output = Utils.Read(input) match {
      case Some(predict: Predict) => {
        println(predict)
        predict.process(client)
      }
      case Some(train: Training) => {
        println(train)
        train.process(client)
      }
      case _ => {
          println(input)
          Right(new AlgorithmException(s"failed to parse"))
    }
    }
    output match {
      case Left(result) => Utils.Write(result).nospaces
      case Right(err) => throw err
    }
  }

Predict.scala

case class Predict(text: String, namespace: Option[String]) {
...
...
}

object Predict{
  implicit def ClusterCodec: CodecJson[Predict] =
    casecodec2(Predict.apply, Predict.unapply)(
      "text",
      "namespace"
    )
}

Training.scala

case class Training(labelData: Option[List[DataPoint]], labelFile: Option[String], namespace: Option[String]){
...
...
}

object Training{
  implicit def ClusterCodec: CodecJson[Training] =
    casecodec3(Training.apply, Training.unapply)(
      "labelData",
      "labelFile",
      "namespace"
    )
}