Re: WS-Events

[John Fuller <jfuller@wernervas.com>]

It sounds like May 2004 for the specification, June for 
interoperability demos.
We're on a schedule to release a revised draft every 15th of the month.

It appears that
in the Workflow community service instance state is managed in terms of 
sets of activities,
in the Grid community as an explicit set of service data elements and 
updates are in effect events,
and I suppose traditionally there's an implicit state where messages or 
operations are implicit events.

Both ASAP and OSGI also have the idea of observers subscribing for 
notifications,
in the case of ASAP the state change notifications are sent to the 
observer,
in the case of OGSI an XML subscription expression (for use with XPath?)
describes when to notify the observer based on service element 
(effectively state/substate) changes.

I've been sort of swayed that an explicit request for state change may 
be appropriate
for the high level states for ASAP, and it appears that substates of 
subprocesses for workflow
are handled by explicitly addressing the activity states,
but I still wonder if explicit events wouldn't be useful for 
asynchronous service instances,
and I think the more perspectives, experiences, and relevant artifacts 
available to our discussion the better.

Anxious to hear everyone's thoughts,
John


On Dec 29, 2003, at 12:38 PM, Vambenepe, William N wrote:

> Hi John,
>
> Yes, support for events is a major missing piece in the Web services
> puzzle. As you may know, this is a need that impacts other working
> groups. For example, the WSDM (Web Services Distributed Management) TC
> in OASIS (where WS-Events has been submitted by HP as part of WSMF, The
> Web Services Management Framework) also has a requirement on the use of
> events. It seems clear that both TCs, along with other working groups
> would benefit from a common spec for handling Web services events.
>
> We are doing further work on Web services eventing and it should be 
> made
> public relatively soon. What kind of timeframe is the ASAP TC on?
>
> Regards,
>
> William