Hi Len,

I think of both feeds and SQL queries as pull technologies - the user 
checks the feed to see if there's anything new, or does a query to see 
if there's anything new.

For this kind of push application, I'd be more inclined to use a 
messaging system that has both guaranteed delivery and really good 
performance. One of my current hobby horses is the AMQP protocol, which 
will be supported by Red Hat Messaging, an open source implementation 
for enterprise level applications. Early versions are available to 
download and play with.

Check it out here:

http://labs.jboss.com/rhmessaging/
http://rhm.et.redhat.com/page/Getting_Started_With_RHM

Jonathan

Len Bullard wrote:
> Hi Peter:
>
> It's early in the project and as with most under-defined.  Initially I am
> giving them a dashboard with categorized information in tab-organized
> gridview/detailView combos, but an RSS Reader (rssFeed) is located in the
> left panel.  Being new to implementing RSS in the web page, I'm still
> weighing options.   Having the RSS client is useful for things other than
> providing database information (eg, local radar and specified news feeds),
> but to an inexperienced eye (mine), it seems like an ideal way to distribute
> scheduled reports.   I seem to get resistance to this idea and I was
> wondering if there is real world practicum for how to divide up the tasks.
>
> To answer your question, at the moment most of the requirements deal with
> information behind the firewall.  On the other hand, since it is part of a
> national system, that changes post-deployment and then one loses control of
> the client space (as one should).   The specs are oriented toward ebXML/SOAP
> but that seems like overkill for document/messages that are one-way
> (pushed).
>
> len
>
> -----Original Message-----
> From: Peter Hunsberger [mailto:peter.hunsberger@g...] 
> Sent: Wednesday, August 08, 2007 12:48 PM
> To: Len Bullard
> Cc: xml-dev@l...
> Subject: Re: [xml-dev] XML Feeds vs SQL Queries
>
> On 8/8/07, Len Bullard <len.bullard@u...> wrote:
>   
>> Given a choice for implementing dashboards that support near-real time
>> notifications, would you implement XML feeds or SQL queries and why?
>>
>>     
>
> I'd want to know more about the requirements:
>
> - # of end users ?
> - distributed or  local  (inside or outside the firewall) ?
> - many or few points to be monitored ?
> - is customization per individual required (feeds and / or look and feel)?
>
> For example, if we need highly customizable distributed clients I'd
> likely end up looking at XML with client side XSLT.  Or conversely, if
>  no customization was required everything was local, behind the
> firewall and we already had a MS environment then SQL might make
> sense...
>
>