@Override
    public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        infoLog("Connection disconnect to {}", RemotingUtil.parseRemoteAddress(ctx.channel()));
        super.disconnect(ctx, promise);
    }
@see io.netty.channel.ChannelDuplexHandler#disconnect(io.netty.channel.ChannelHandlerContext, io.netty.channel.ChannelPromise)
src/main/java/com/alipay/remoting/ConnectionEventHandler.java