When everybody are talking about SOA, I would like to put my perspective. For me, this is a new way of building systems as well as wiring systems without hardwiring. Here we have to carefully create topologies keeping basics in mind.
I see enterprises with event-centric environment, where most of the interactions are fine grained events. For these, message driven systems with a reliable message broker will be appropriate.
On the other hand, enterprises with large volume data processing should be optimized for processing with either mainframes/ large CPU based work horses.
ESB systems are still important, but more in the event-centric environment.
Again, my take might change as I go deep into the implementations I am working on.
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