https://groups.google.com/forum/?fromgroups=#!topic/scala-user/Z-NXRQzPf70

NettyFutureBridge.scala

object NettyFutureBridge { 
  import scala.concurrent.{ Promise, Future }
  import scala.util.Try
  import java.util.concurrent.CancellationException 
  import org.jboss.netty.channel.{ Channel, ChannelFuture, ChannelFutureListener }

  def apply(nettyFuture: ChannelFuture): Future[Channel] = { 
    val p = Promise[Channel]() 
    nettyFuture.addListener(new ChannelFutureListener { 
      def operationComplete(future: ChannelFuture): Unit = p complete Try( 
        if (future.isSuccess) future.getChannel
        else if (future.isCancelled) throw new CancellationException 
        else throw future.getCause)
    }) 
    p.future 
  }
}