[jdev] Cancelling an iq query

[Julien PUYDT]

Ralph Meijer a écrit :
> On Mon, Aug 29, 2005 at 08:21:39PM +0200, Norman Rasmussen wrote:
> 
>>I think the point here, is that nothing stops you from writing an
>>AdHoc command that returns a list of currently executing commands, and
>>allows you to pick on, and cancel it.
> 
> 
> Sure, you could use JEP-0050 for that, but that wasn't the complete
> problem of the other Ralph. He wanted to be able to cancel a placed
> request *and* still receive results asynchronously. Or do you propose
> not replying to the original <iq/> until the request has indeed been
> completed or cancelled?
> 

Wouldn't it be possible to go like this (oversimplified not valid but
should get the point) :
client: <iq id='cmd1' ...>do-something-for-me</iq>
server: <iq id='cmd1'  type='result' ...>ack #foo</iq> (means: ok, I'll
do it for you, I number it #foo)

Then later, either:
client: <iq id='cmd2' ...>cancel #foo</iq> (means: I change my mind,
stop it)
server: <iq id='cmd2' type='result' .../> (means: ok, task cancelled)

Or:
server: <iq id='res1' ...> #foo gave result bar</iq> (means: here is the
answer to what you asked and I call #foo)
client: <iq id='res1' type='result' .../> (means: got it, thanks!)

That way you have both asynchronous results and the ability to cancel
something after some time. You could even imagine doing more than
cancelling: changing the request.

My two eurocents,

Snark on #gnomemeeting