I'm not sure that it makes it easier if you think about it being about "just subscribe" from a business perspective an Event isn't just something that "happens" its something that _must_ be reacted to. This puts a question of non-repudiation into the mix which doesn't exactly make it all easier.
For me EDA is just ONE of the potential implementation approaches for a set of business services and is one approach for the Execution Context implementation of the OASIS SOA RM. EDA can work at the business level but its the organisational boundaries (the services) that represent the producers and consumers of those events, without those organisational bounds the events have no management base which is a bad thing. Of course this could also be one of those T-SOA, B-SOA and T-EDA and B-EDA discussion problems. Steve 2008/10/16 Paul Fremantle <[EMAIL PROTECTED]>: > I have a simple view of SOA and EDA: > > SOA is about devolving interfaces management and definition to > endpoints. In an SOA, its not my responsibility to understand your > interface, its your responsibility to produce an interface that anyone > (including me) can handle. So an SOA offers a set of services that > have uniform interfaces that can be accessed by anyone. > But its still required that a service provider advertises their > services and a service consumer explicitly calls those interfaces. So > the wiring is not devolved. > > In EDA, the model goes a stage further: not only are the interfaces > defined, but their is a wider definition (the topic space) which > identifies the overall structure of all the > interfaces/services/event-types. And in this model, the wiring is > devolved - its up to anyone who needs access to information to > subscribe themselves to that topic. > > Of course in order to make this work, the model also needs > simplification. SOA is effectively a simplification by forcing > everyone to use uniform interfaces. EDA forces an even simpler model - > everything must be one-way/event-based and it is up to the > event-consumer to understand what to do with that event. > > On a related topic, I've been involved in an SOA/EDA project and we > came across an interesting puzzle/problem with interfacing EDA with > complete black-box systems. I wrote about it here: > http://pzf.fremantle.org/2008/09/interesting-problem-in-event-driven.html > > Paul > > -- > Paul Fremantle > Co-Founder and CTO, WSO2 > Apache Synapse PMC Chair > OASIS WS-RX TC Co-chair > > blog: http://pzf.fremantle.org > [EMAIL PROTECTED] > > "Oxygenating the Web Service Platform", www.wso2.com > >
