<<A new entity is emerging, deep within the SOA fabric, as crucial as the web application server became at the dawn of web-based distributed computing. This new entity doesn't have a name or a well- defined shape, yet. But it must evolve before the new era of services-based distributed computing can have its day.
Its role boils down to policy-driven message routing and monitoring. More expansively, what that means is that this is an entity that: passes messages across the services infrastructure (ie on their journey between endpoints), monitors the headers and content of messages, with a view to logging, reporting, or acting on the data it discovers, transforms messages in accordance with the policies laid down in the service contract they're fulfilling, and takes actions (eg re-routing or transforming the message, and/or sending an alert) to enforce any overarching governing policies where a message appears to infringe them. Classically speaking, this is a message broker, but the term is so overloaded with legacy meanings that using it often obscures rather than helps productive discussion of what shape it should take in a standards-based, loosely coupled, services-oriented architecture. Most crucially, a broker tends to be imagined as a single component some kind of hub or crossing point through which every message must pass, which is inconsistent with the notion of a truly distributed, loosely coupled architecture. The entity that's required is more likely to be a loose confederation of co-operating components collectively, a mediation services layer and the collective name for those components could be 'mediation services brokers'.>> You can find this blog at: http://www.looselycoupled.com/blog/lc00aa00121.html Gervas ------------------------ Yahoo! Groups Sponsor --------------------~--> Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life. http://us.click.yahoo.com/A77XvD/vlQLAA/TtwFAA/NhFolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/service-orientated-architecture/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
