class ServerBridge[In, Out](
  serveTransport: Transport[In, Out] => Unit,
) extends SimpleChannelHandler { 
    override def channelOpen(
      ctx: ChannelHandlerContext,
      e: ChannelStateEvent
    ){
      val channel = e.getChannel
      val transport = new ChannelTransport[In, Out](channel) // #1
      serveTransport(transport)
      super.channelOpen(ctx, e)
    }
    override def exceptionCaught(
      ctx: ChannelHandlerContext,
      e: ExceptionEvent
    ) { // log exception and close channel }
}
// #1 Is called once a new Channel was open and create a new ChannelTransport to bridge to Finagle
// see https://github.com/twitter/finagle/blob/master/finagle-core/src/main/scala/com/twitter/finagle/netty3/server.scala