Wednesday, October 31, 2007

EDA/ESB is SOA2: Why fine-grained SOA is good and ESB-based UI is good

EDA/ESB is SOA2: Why fine-grained SOA is good and ESB-based UI is good

------SOA2: As I pointed out in my previous blog, the key of SOA is nothing but EDA/ESB/MOM. As a result, we should say that all those SOA hypes are just "warming-up round, or, round 1" of SOA. The real SOA, i.e., SOA2, is EDA/ESB/MOM.

ESB is MOM with a "service" interface, instead of "proprietary" interface (e.g. JMS. Note that JMS is a standard; however, it is too narrow, so, it is "proprietary" in the big schema of things).

------Fine-grained SOA: because at ESB level, we can do so many things, for free. So, we should make service fine-grained, that is, as fine grained as practically possible. Will that slow down things, like early days of COM or EJB? Ya, but that is where "practically possible" counts.


------ESB-based UI: Some ESB vendors (e.g. Webmethods) put UI support above ESB. It is a powerful concept; we should discard "proprietary UI" (M$'s VS or Java IDEs; of course, except the ones with ESB-based UI -- e.g., Webmethods uses Eclipse for its ESB-based UI), and replace them with ESB-based UI.

(a) Advanced web2/Ajax based controls for free (if you buy the product, of course!).
(b) It makes look-and-feel more consistent.
(c) It enforces SOA: you have to use SOA2 now.

(d) However, note that a good ESB can support using proprietary UI, and still provide all ESB benefits. Actually, it is more an issue of the IDE of the proprietary UI: you can put the service in ESB, and then, in your proprietary UI, you call the API from the ESB. As you can see, there is no reason not using ESB-based UI!

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