// StreamingJob.scala

...

val filteredEvents = content
      .map(x => Event.toCaseClass(x))
      .filter(x => x.value == true)

...

// Event.scala

case class Event(
                  id: String,
                  value: Int,
                )
object Event {
  implicit val formats = DefaultFormats

  def toCaseClass(str: String) =
    parse(str).extract[Event]
}