Dennis I define uniform as being: 1. accessible easily using commonly available technologies (e.g. XML) 2. with a well-defined message format available to all parties (e.g. XML Schema) 3. with common patterns shared across multiple parts of the business (e.g. definition of a customer) 4. and optionally/ideally a standard set of schemas if possible (e.g. UBL2 etc)
Paul On Thu, Oct 16, 2008 at 2:39 PM, Dennis Djenfer <[EMAIL PROTECTED]> wrote: > Paul, > > How do you define uniform in this context? > > // Dennis Djenfer > > > Paul Fremantle wrote: > > 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 > > > > ________________________________ > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.173 / Virus Database: 270.8.1/1727 - Release Date: 10/15/2008 > 8:02 PM > > > > -- 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
