Channel attachments?

[Marc-André Laverdière]

Hello,

I hit something like that in my development efforts. I was trying to
put the session ID using the attachment, and that wasn't working in my
app... I'd get a null when I expected a String.

So I created a global object that wraps around a ChannelLocal and my
handlers refer to it to get the session ID.

Hardly a cute design, but it works.

The attachment feature in ChannelHandlerContext should be this wrapper
around a ChannelLocal and should be enough for everybody's needs.
Maybe that is what its meant to be but there is a bug, I don't know (I
haven't looked at the code).

What I would find nice is that we could use generics so that we're not
stuck casting from Object and cross our fingers that nobody else in
the dev team broke the pipeline or something...

Marc-André LAVERDIÈRE
"Perseverance must finish its work so that you may be mature and
complete, not lacking anything." -James 1:4
mlaverd.theunixplace.com/blog

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2010/6/11 blakeman8192 <blakeman8192 at hotmail.com>
>
> I've used MINA, which was made by the same developer.
>
> MINA used to have setAttachment(Object) and getAttachment() methods, then
> later got setAttribute(String, Object) and getAttribute(String) methods.
> These are really convenient.
>
> Netty doesn't seem to have any methods of the sort for Channel.
>
> I know that Netty has setAttachment(Object) and getAttachment() for a
> ChannelHandlerContext, but in the server I'm developing, there are different
> decoders that replace each other. I need some way to keep track of
> attributes for a Channel, not a ChannelHandlerContext because the
> ChannelHandlerContexts do change so what I attach to one will not be a part
> of another.
>
> I've noticed ChannelLocal, but there is no method to get a ChannelLocal
> object for a Channel. It also seems pretty redundant to use a Map<Channel,
> ChannelLocal> to keep track of ChannelLocal objects for Channels.
>
> I need a more elegant way to keep track of different objects (i.e. a Player
> object) for a Channel.
> Is this overlooked in the Netty design, or (more likely) am I missing
> something?
>
> Thanks for your time,
> -Blake
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