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Subject: RE: [soa-rm-ra] Management Model section after comments of this week
Om point three I am saying that SLA manageability is part of the
business performance manageability, so we are still a bit apart Sorry, still not buying number 1 – service execution is opaque
and is implementation that is not visible to ecosystem, hence not manageable by
ecosystem Definition of service, as it put forth is explicitly saying that
service is business meaningful. I do not see a reason to reopen this. As for
managing a kitchen sink – design is a purview of governance, but not manageability. From: mpoulin@usa.com
[mailto:mpoulin@usa.com] It looks like we agree on point 3, Boris. For point 1, "service invocation
manageability" manages mechnaisms that trigger service execution. An
inercia of thinking recognises only one way of service invocation - via a
request from the consumer. However, the REW (its shareable side) tells us that
not all consumers have to request the service explicitly to reach its values. So,
a service can be invoked in one part explicitly to start monitoring the events
while the real execution of the service's business functionality (capability)
is based on the observed events. These mechanisms and related events are
the subject of this manageability. Are these explanations enough to agree on point 1? For point 2, I disagree that composability is so natural aspect of
the service that it does not require management. I think that this aspect is
provided beacuse of the proper management. Then, I did not agree that service
is always a business/human functions implementing thing. I do "allow"
some technical utility services to exist; they mind their own technical
business. Also, the "kitchen sink" is what has to be properly
managed if you want to get a good combined service. Placing a Web Service
pigskin on a legacy application (known as a Composit Application) never
delivered a good service... So, I do not see principle objections to the point 2. Are we in
agreemnt? - Michael -----Original Message----- See below: From: mpoulin@usa.com
[mailto:mpoulin@usa.com]
Boris, I think that our task is not to set a status of
"disagree" but to find a solution to resolve the disagreement. 1. About
Event Manageability. It seems to me that "service invocation
manageability" might work because I certainly do not want to manage events
that may be even outside of SOA ecosystem. Also, I do distinguish (despite of
EDA vision) between the event and reporting of this event. A consideration I
use is this: if nobody (in given realm) listens to/monitors the event, this
does not mean that the event has not happened; one event may cause another
event - a sad example: an earthquake causes a tsunami - and, if we
discard the initial event as non-existed but we recognise the caused event, we
have to deal with things without reasons, out of the blue, which is not natural
and unacceptable to me. So, an events selection manageability is a sort of a view inside
and outside the SOA ecosystem for the service invocation triggers. What does service invocation manageability means – what does it
manage exactly? 2. I do respect IBM’s viewpoint but
they proofed they are not very fast with changes and they still take SOA
service as a Web Service in several of their even modern applications and
papers while others (e.g. Dr. Marc Fiammante) are quite in synch with what we do in OASIS. So, a service, even a composite or aggregate service depends only
on functionality it needs from others. Considering an explicit contracts and a
possibility of the trusted realm, a service (and its implementation like a
process) may not and do not need to know who actually provides required
functionality. By Combination or Composability
Management I mean (but may be did not use proper words to articulate) a
management of service capabilities to be used in the combinations or to combine
others for providing solution for common task. (This is a
basic service property, that does not need to be managed) This,
particularly, includes: special relationship between business services
and Data Services / Data Access Layer (I thought
we agreed that services are always business services.), enforcement of policies related to the granularity of interfaces,
management of information stores/repositories for meta-data, management of the
processes and procedures – development and run-time – that result in new
service combinations (which may include as integration as testing aspects), (I am sorry,
but first this is a kitchen sink, and second those a design concerns, which are
not quite subject of manageability) and so on. I hope, you’ve got the picture. Configuration
management may also take place among others in this domain but, IMO, it is
certainly not the major one. 3. The last one – management
of business performances – do require and use SLA and SLA management but the
letter is not always a visible part of the former. This is why I put them
separately: the SLA management can still be provisioned at many different
levels (including pure technical ones) while management of business
performances may be more laid around business KPI. I am not saying that they are the same. I am saing that they are
related. What do you think? - Michael -----Original Message----- Do you see events manageability as service invocation
manageability? I do not think I see it this way On everything else, Let’s see we agree to disagree What you call composability I call dependence – see IBM’s
service model – a service can have both interfaces and dependencies For me also, business performance requires SLA From: mpoulin@usa.com
[mailto:mpoulin@usa.com]
Boris, at a glance:
-----Original Message----- Here is my manageability proposal: ·
Lifecycle Manageability ·
Configuration manageability o Dependency
manageability ·
Policies Manageability ·
Contracts manageability ·
Business Performance manageability o SLA
Manageability Event Monitoring Manageability is really about reporting and
should not be there From: mpoulin@usa.com
[mailto:mpoulin@usa.com]
Folks, I have incorporated all comments and chnages into attached
document. In some places, I have repeated the text (in different font) just to
save and show the comments that I responeded insted but didn't change the text.
I am not sure what tactics we prefer now - to go through all left
comments together in the meeting or for me to resolve each comment with
particular author (in some cases I disagree with the comment, however). Cheers, - Michael The information contained in this communication may be
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