W3C home > Mailing lists > Public > public-web-intents@w3.org > January 2012

Re: Mapping WebIntents to Network Service Discovery API

From: Matt Hammond <Matt.Hammond@bbc.co.uk>
Date: Mon, 09 Jan 2012 13:49:03 -0000
To: WebIntents <public-web-intents@w3.org>
Cc: "Clarke Stevens" <C.Stevens@cablelabs.com>
Message-ID: <op.v7tkn1nuwh9xod@r44116>
On Fri, 06 Jan 2012 23:37:41 -0000, Clarke Stevens  
<C.Stevens@cablelabs.com> wrote:

> I think the mapping is fairly straightforward with one exception. For  
> some
> protocols (e.g. UPnP) it is necessary to support device-initiated events.
> Since I think this same requirement would exist for other frequently used
> WebIntents examples (like printing documents), I think there must be a
> common solution, but I'm having trouble finding one.

Perhaps separate "event notification" intents could implemented in a  
long-polling style? This would take advantage of an intent's ability to  
return a response.

A client would fire off this intent, then be asynchronously sent a  
response when an event occurs. The client would then need to re-fire the  
same intent to capture the next event, unless it is no longer interested  
in being notified of them.

In the context of printing, this might manifest as:

1) The client requests a PrinterStatusChangeNotification intent
2) When the printer runs out of paper, a response is returned to the  
client from this intent.
3) The client requests a PrinterStatusChangeNotification intent again
4) The client is notified when the printer changes state again
5) ...

| Matt Hammond
| Senior Research Engineer, BBC R&D, Centre House, London
| http://www.bbc.co.uk/rd/

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Received on Monday, 9 January 2012 13:49:34 UTC

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