Why is it valuable to define an “anti-pattern”
such as the one discussed here? Doesn’t this anti pattern apply to
pretty much all programming models? It looks like y’all are fishing
here.
Just my CAD$0.02…
-matt
From: Miko Matsumura
[mailto:]
Sent: Tuesday, October 25, 2005
4:10 PM
To:
Subject: RE: [soa-blueprints]
Anti-Blueprints
Good feedback Duane.
This is a good topic, thanks for
introducing it, Steve.
The number of services *is* a quantitative
measure, but perhaps not a very helpful one? =)
I'm pretty sure there's an antipattern
here, and I think perhaps there could be some kind of way to assess this. I
think another variable in this mix is the extent to which the registry
repository in question can help with respect to discovery and classification as
well as governance. The thing that worries me is when I see people assuming
that fine grained (object level) services will be reused, when the reality is
that OO didnt generate that much reuse from even the guy in the next cubicle,
let alone across the company or across the planet.
I think this is less of a gross number of
services antipattern so much as a coarse-grained vs fine-grained antipattern...
Best,
Miko
From: Duane
Nickull [mailto:]
Sent: Tuesday, October 25, 2005
12:57 PM
To:
Subject: RE: [soa-blueprints]
Anti-Blueprints
I disagree with this anti-pattern.
I am not sure that the number of services
is really a quantitative measure of SOA. A grid computing cluster
administrator may be able to rationalize such behavior, although it may seem
absurd in other areas such as Amazon deploying a service for each book it
carries vs. deploying one service that allows the consumer to parameterize the
book title.
Perhaps a better measure would be the development
of some test criteria to ascertain whether a contemplated service is a good
candidate for repurposing beyond a small number of consumers. This should
be based on alignment with LOB and presumably different implementers will have
different criteria for quantifying such.
Duane
From: Miko Matsumura
[mailto:]
Sent: Tuesday, October 25, 2005
12:41 PM
To: ;
;
Subject: RE: [soa-blueprints] Anti-Blueprints
I just added a
"microservice" antipattern where programmers put 10000000 WSDLs into
a registry just because their IDE lets them do so.
Miko
From:
[mailto:]
Sent: Tuesday, October 25, 2005 11:54
AM
To: ;
Subject: RE: [soa-blueprints]
Anti-Blueprints
Steve,
Good idea. I put up the
first drafts of them at: http://blueprints.jot.com/WikiHome/SOA+Anti-Patterns/SOA%20Anti-Patterns
Let me know if I
correctly eloborated and named them for you.
Thanks,
Dan
-----Original Message-----
From: Jones, Steve G
[mailto:]
Sent: Tuesday, October 25, 2005
11:21 AM
To:
Subject: [soa-blueprints]
Anti-Blueprints
The SOA Blueprints will lay down a “best
practice” set of guidelines and templates for delivering SOA. This
will definitely be a positive thing and help expand and firm up people’s
understanding of SOA. One thing that the group states that it will do is
define standards and guidelines, does this mean that allied to our blueprints
we must also consider the “anti-blueprints” (analogous to
anti-patterns) that must be avoided. So for instance focusing on process
over service (bad), only thinking of web services (bad) etc etc. Defining
the blueprints give guidance towards success criteria, but should we also give
guidance on failure criteria for acceptance of a system as being
“SOA”.
Not sure whether this should be in the TC as its
laying down best practice, and not to increase the already large
workload… but it needs to be somewhere.
My top 5 are
1)
If you’ve started with an enterprise “best
practice” process map you are NEVER going to be SOA and 90% probability
your system will be inflexible or fail.
2)
Web Service point to point is STILL point to point, doing a
bad practice in XML doesn’t make it better
3)
Splitting into two separate tiers of Service and Process
with separate rules and governance results in divergent solutions
4)
Creating “business” services based on the belief
that IT understands the business results in services that meet neither IT nor
business goals
5)
Building your own proprietary XML-RPC stack to give yourself
“control“
The last could still be SOA from one perspective, but
I’ve yet to see it done well when the driver was a belief that its better
done in house than using standards. When we get the official Wiki it
could be something to document via that route.
Steve
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CTO, Application Development Transformation
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