Fwd: RE: [ogsa-bes-wg] Proposed changes to Spec.

[Steven Newhouse]

Ian,

Apologies for the delayed reply... I think we all got distracted by the 
WS-Names debate... and having just looked at the draft specification 
today for the first time today in a month or so let me take a stab at 
providing an answer.

>>> I would like to argue against your proposed operations on the grounds 
>>> of fragility and scalability.

Recall that most of the BES discussion until recently was focused on the 
  'abstract' interface. There are now two renderings - a WSRF and a 
'plain' WS.

At the moment the specification (and the renderings) do not mandate any 
particular registry function. I see no reason why WSRF based activities 
could not be federated through WS-ServiceGroups (though I'm not exactly 
sure how they work... I'm interpreting them as a 'sort of' registry view 
- apologies if this is incorrect) or the plain WS through a UDDI registry.

The respective clients would not need to maintain a list of the 
endpoints they where interested in (but could do so) as these could be 
obtained from the service group or by searching the registry. Having 
extracted a list of end points these could be applied to the running 
activities through the operations on their respective containers.

>>> I suggest (as we have also suggested in earlier communications to 
>>> BES-WG) that we should instead allow the user to specify a set of 
>>> activities that are to be monitored or controlled in terms of their 
>>> properties, not names. E.g., "activities that belong to me", 
>>> "activities that involve executable Foo", "activities that have been 
>>> running for over 2 hours."

So I don't see these operations ruled out by what we've done... but not 
explicitly defined. I'm not sure if these registry functions/capability 
need to be defined/declared within the service specification. Is this 
not a broader property of the deployed SOA - e.g. UDDI registry, MDS 
type federation or P2P structure?

Regards,

Steven
-- 
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Dr Steven Newhouse                        Tel:+44 (0)2380 598789
Deputy Director, Open Middleware Infrastructure Institute (OMII)
Suite 6005, Faraday Building (B21), Highfield Campus,
Southampton University, Highfield, Southampton, SO17 1BJ,  UK