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Wednesday, March 16, 2005
In this keynote David Chappell promises to provide insights into an SOA approach to development and how it's affecting the way that we work. It should prove interesting.
8:22 AM
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In this keynote David Chappell promises to provide insights into an SOA approach to development and how it's affecting the way that we work. It should prove interesting.
We're moving to a new architecture. It's good to think of a four-layer approach: data (relational), logic (objects), access (services), and presentation.
The dominant vendors have decided that a service is defined by the WS* standards.
We need persistent queueing of messages to make this stuff work. It needs to be addressed in the specs.
Service-oriented reuse is possible, but it's not like reusing objects.
Building services is easy, designing a service oriented app is a bigger challenge. Hardest of all are SOA organizational changes such as defining SLAs for services.
Most orgs are introducing SOAs as a bottom-up, grass roots approach. We're using services in our apps, and slowing moving towards SOA. This approach works, but it's a little ugly. At some point (e.g. your 5th app) you'll realize that you need to step back and take a top-down approach. Observation: You might benefit from the Enterprise Architecture discipline described at www.enterpriseunifiedprocess.com/essays/enterpriseArchitecture.html
The Business Process Modeling Notation (BPMN) is an emerging standard for modeling processes. IMHO BPMN is pretty good, but not a lot of people understand it and few tools support it yet. Frankly, I don't see anything wrong with using data flow diagrams, although have to admit that I'd like to see a good, standard notation adopted within the industry. UML activity diagrams are ok, but they're not optimal for process modeling.
Business rule engines (BREs) may be just about ready to go mainstream. The good thing is that all the rules are in one place. The bad thing is that this can be pretty slow, but luckily the technology is improving. Also, the BRs can be pretty hard to maintain.
Business analysts can do more than just define requirements (IMHO, exactly!)
The move to SOA is analogous to the move to TCP/IP ten years ago.
SOA is the biggest thing in software development for the next several years.
If you don't like change, get out of the software business. ;-)
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