Scalaでmemched繋ぎたいけどmemcached落ちててもエラーにならないようにするコード。動いてるけどまったくScalaらしくないのでなんとかしたい。

gistfile1.scala

import net.rubyeye.xmemcached._

object Memcache {
  def apply(host: String, port: Int): Memcache = {
    val mc = new Memcache
    mc.connect(host, port)
    mc
  }
}

class Memcache { 

  private var client: XMemcachedClient = null
  
  def connect(host: String, port: Int): Unit = {
    try {
      client = new XMemcachedClient(host, port)
    } catch {
      case e: Exception => {
        println("memcached connect error host:%s port:%d".format(host, port))
      }
    }
  }
  
  /**
   * This function returns true if a key exists on memcached
   */
  def exists(key: String): Boolean = {
    try {
      if(client == null) {
        false
      } else {
        Option(client.get[Any](key)) match {
          case None => false
          case _    => true
        }
      }
    } catch {
      case e: Exception => {
        println("memcached get error error=%s".format(e.toString))
        false
      }
    }
  }

  def close(): Unit = {
    if(client != null && !client.isShutdown) {
      client.shutdown
    } 
  }
  
}