RE: [wsn] Boxcarring and reliability

["Martin Chapman" <martin.chapman@oracle.com>]

Boxcarring means that notify messages are bundled in a single soap
message. ws-rx works at the soap level so it doesn’t need to know about
boxcarring of notify messages.

Martin.

>-----Original Message-----
>From: David Hull [mailto:dmh@tibco.com] 
>Sent: Wednesday, January 04, 2006 10:32 PM
>To: wsn@lists.oasis-open.org
>Subject: [wsn] Boxcarring and reliability
>
>
>Following the example of the reliability specs, we distinguish 
>between producing and delivering.  If we boxcar a set of 
>Notifications in a Notify message, are they required to be 
>delivered atomically?  IMHO, boxcarring is a transport-level 
>optimization and atomicity should be handled separately (it 
>should be possible to handle a set of messages atomically even 
>if they happen to be transmitted in different SOAP envelopes).
>
>Ideally, each of the boxcarred messages would have its own 
>delivery status.  E.g., I am able to process the first five of 
>ten boxcarred messages and acknowledge them, and then my 
>process crashes or the network goes down.  To accomplish this, 
>though, the reliability layer would have to know about the 
>boxcarring.  This argues for handling boxcarring outside WSN 
>(WS-Boxcarring, anyone?  WS-Polling is already underway ...)
>
>Thoughts?
>
>