stuff.scala

class Foo(x: Int) {
  def this(x: String) = this(x.toInt)
}

class Bar(x: Int)

object Bar {
  def apply(x: String) = new Bar(x.toInt)
}


// in use...

val f = new Foo("15")
val b = Bar("15")


// ---------------------------------------------------------


// Approach #1

class RedisCache(client: RedisClient, keyPrefix: Option[String] = None) {
  def this(host: String, port: Int, keyPrefix: Option[String] = None)(implicit system: ActorSystem) =
    this(new RedisClient(host, port)(system), keyPrefix)
}

val r = new RedisCache("http://redis.example.com", 100) with AppLogger

// Approach #2

class RedisCache(client: RedisClient, keyPrefix: Option[String])

object RedisCache {
  def apply(host: String, port: Int, log: LoggerLike, keyPrefix: Option[String] = None) =
    new RedisCache(new RedisClient(host, port), keyPrefix) {
      val logger = log
    }
}

val r = RedisCache("http://redis.example.com", 100, AppLogger.logger)