I see the events in a event-driven system are emitted by some sources
(or agents) and consumed by consumers ( sinks). Sinks have the
responsibility of applying a reaction as soon as an event is presented.
Generally, event are transmitted among loosely coupled software
components. One important think to note here is that source and sinks
may not be aware of each other in the event processing and hence this
results in the highly modular and loosely coupled applications.
I apologizes if I am wrong but I see ECAs as interceptors similar to the
aspect oriented stuff and they are triggered as part of the call to service.
Thanks,
Raj
David E Jones wrote:
It would not be correct to say that EDA (Event Driven Architecture)
and ECA (Event-Condition-Action rules) are the same thing. It would be
correct to say that ECA Rules are one way of implementing an
event-driven architecture (EDA).
If you look at how ECA rules are used in OFBiz you'll see it is very
consistent with the general EDA concepts. With all logic flowing
through the Service Engine in OFBiz it becomes a natural hub for
business events, and ECA rules allow us to do things based on those
business events.
If you disagree, please do share. How is your vision of an EDA
different from how we use ECA rules in OFBiz?
-David
On Jan 17, 2009, at 9:07 PM, Raj Saini wrote:
Is ECA same as EDA? I feel ECAs in OFBiz are more like
interceptors/triggers where are EDA is all together a different
architecture pattern. This is a good document explain EDA:
http://www.eaipatterns.com/docs/EDA.pdf
Thanks,
Raj
Jacques Le Roux wrote:
I think, as a marketing effort, we should put 2-3 sentences about
SOA (Service Oriented Architecture) and EDA (Event Driven
Architecture) OFBiz's features on main site, in "Introduction: What
is Apache OFBiz?" section for instance.
Buzz words (acronyms nowadays) can't hurt if we want more
recognition. And it's easier to be understood by using SOA acronym
than Service Engine and especially EDA instead of ECA. Of course a
sentence explaining quickly both concepts is needed.
Any takers ? (several would be better...)
Jacques
