[standards-jig] Stream Contexts

Justin Karneges justin-jdev at affinix.com
Wed Jun 25 19:56:52 UTC 2003


By 'context' I speak of the link between stream and whatever uses it.  This is 
briefly covered in JEP-95, Section 4.2 and in JEP-41, Section 2.2, however 
these solutions are not optimal in my opinion.

-Justin

On Wednesday 25 June 2003 08:44 am, Thomas Muldowney wrote:
> I'm sorry, but what is the SI JEP doing?  Or is "context", which you
> never fully explain, something magically different?
>
> --temas
>
> On Wed, 2003-06-25 at 06:42, Justin Karneges wrote:
> > Hi all,
> >
> > I had a brainstorm last night (morning?) and I have concluded that one
> > annoying problem with this stream negotiation stuff is that we don't have
> > a clear way of passing context.
> >
> > Context is required to use a stream (S5B,IBB,anything else that arises).
> > There is never a time when you would not have context.  Maybe you don't
> > want SI or REL, but you will surely want context.  It's the one thing we
> > should all be able to agree on.
> >
> > I can see two possible ways to pass context to a stream:
> >
> > 1) Pass it inside of the datastream itself.
> >  or
> > 2) Pass it via the XML handshake of the stream.
> >
> > #1 is like TCP.  Think of HTTP GET.  However, since Jabber streams have
> > much fancier handshakes, we can easily accommodate context inside of the
> > XML exchange, so I'd prefer #2.  Unfortunately, without a standard
> > provision for this, the only acceptable way to pass context with S5B/IBB
> > currently is via the datastream.
> >
> > I propose to author a JEP to describe stream context.  It will be the
> > world's simplest JEP, with the following requirements:
> >
> > * Contexts are simply opaque strings
> > * Contexts must be unique for all streams
> > * Streams must have a provision for passing along the context
> >
> > Example of S5B using a possible standard context:
> >
> >   <iq
> >       type='set'
> >       from='initiator at host1/foo'
> >       to='target at host2/bar'
> >       id='initiate'>
> >     <query
> >       xmlns='http://www.jabber.org/protocol/bytestream'
> >       sid='mySID'
> >       xmlns:context='http://jabber.org/protocol/streamcontext'
> >       context:id='myCID'>
> >       <streamhost
> >           jid='initiator at host1/foo'
> >           host='192.168.4.1'
> >           port='5086'/>
> >     </query>
> >   </iq>
> >
> > Thoughts?
> >
> > -Justin
> > _______________________________________________
> > Standards-JIG mailing list
> > Standards-JIG at jabber.org
> > http://mailman.jabber.org/listinfo/standards-jig
>
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