question: get the listening port . concode_field_sep ChannelGroup allChannels concode_elem_sep InetSocketAddress address concode_elem_sep Channel channel concode_elem_sep Log LOG concode_elem_sep ServerBootstrap bootstrap concode_elem_sep EventLoopGroup workerGroup concode_elem_sep EventLoopGroup bossGroup concode_field_sep void start concode_elem_sep void close concode_elem_sep void initServer
target: int function ( ) { return address . getPort ( ) ; }