RE: [wsn] Proposed requirement from WSDM

["Murray, Bryan P." <bryan.murray@hp.com>]

I would like to try to position this new requirement with respect to some of the existing filtering mechanisms:

 

precondition: when a situation happens, evaluate an expression against the "environment" of the NotificationProducer to determine whether to format and send a notification message.

 

selector: for a situation that has already been formatted into a notification message, evaluate an expression against the notification message to determine whether to send the entire message or not.

 

new requirement from WSDM: when the notification message is formatted and ready to be sent, evaluate an expression against the notification message to determine which subset of the notification message should be sent

 

As the descriptions imply, the evaluations would be done in the order listed.

 

Bryan

---

From: David Hull [mailto:dmh@tibco.com]
Sent: Thursday, September 09, 2004 12:10 PM
Cc: wsn@lists.oasis-open.org
Subject: Re: [wsn] Proposed requirement from WSDM

+1 on "sounds like filtering on steroids"

The other instant reaction is "sounds like you're not making good use of topics."  I.e., each submessage should be on its own topic.  If you want more info, subscribe to more topics.  I'd like to see a strong use case that can only reasonably be solved by this kind of filtering.

That said, this could probably be treated as a particularly funky dialect of precondition.

Vambenepe, William N wrote:

Dear WSNers,

The WSDM TC would like to submit the following requirement to WSN:

"Add the option, when subscribing for notification, to specify that only
parts of the message should be sent. Note that the message that is sent
still needs to be schema-valid for the schema of the message."

The reasoning behind this requirement is that the content of the
notification message can get very large and in some cases only a subset
of this is of interest to the consumer. And in some cases, the
notification producer doesn't know what parts of the notification the
consumer is interested in, but the subscriber knows. So it should be
possible for the subscriber to express this in the subscription.

The WSDM TC would like WSN to add this to the WSN issues list.

Regards,

William

PS: doesn't it make us all feel good that Outlook wants to correct
"WSNers" to "Winners" on the first line of this email? ;-)