Jan Algermissen wrote:
> [1] Though I wonder if that is really possible, since AFAIK
> distributed systems usually need some sort of (eventually)
> centralized name lookup service and from a manageability POV, there
> should be some centralized form of 'credentials' management (e.g.
> NIS, LDAP) so they need not be spread across all nodes of a given
> system.
I think there is a big difference between a "central service" and a "centrally
important service". I keep sensing a lot of CORBA ORB oriented references in
all of this SOA vs Object Systems. I think there is an attempt at saying,
indirectly that SOA's shouldn't contain an ORB because that was a bad
experience
for some (if not many) who didn't know how to build a distributed system.
But, I can only guess at these things, since I'm not them.
Sure are some very interesting and seemingly oddly focused comments about what
SOA really is floating around.
An SOA to me is an architecture where you have the freedom to add a separate
service to solve a problem just as easily as you might add a new
function/method
to an existing API. It's the software system that enables you to do this. If
your system architecture is simply constructed as a composite, single process
system, where no parts can be separated to a second system to scale CPU or
distributed geographically to manage long distance latency or connectivity
failures, it's not SOA.
If your software development platform includes APIs that take the 8 fallacies
of
distributed computing into account and support a software architecture and
associated APIs that encourage remoting of operations at whatever granularity
make sense, then you have the ability to create an SOA with that platform.
But, you still have to do the right things to make SOA a reality.
Gregg Wonderly
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