anchor.diff:  package com.twitter.birdname
   
  +import com.twitter.conversions.time._
   import com.twitter.logging.Logger
   import com.twitter.util._
   import java.util.concurrent.Executors
  
positive.code:     database.get(key) match {
        case None =>
          log.debug("get %s: miss", key)
          Future.exception(new BirdNameException("No such key"))
        case Some(value) =>
          log.debug("get %s: hit", key)
          Future(value)
  
negative.code:     database(key) = value
      Future.Unit
    }
  
    def shutdown() = {
      super.shutdown(0.seconds)
    }
  }
  