| So, per Sam's explanation and some of my previous thoughts, EDA will make use of a service that monitors triggers for action and will make use of management services that gather metrics about when such triggers are activated.
Ken On Oct 3, 2007, at 9:13 PM, Sam Chance wrote: It seems to me that EDA is largely a "polling" or "monitoring" activity in the popularized manifestation of SOA (i.e. SOAP, WSDL/REST, UDDI). That is to say, the events are largely based on checking and re-checking static, location dependent services. It seems inefficient and not scalable; and, therefore, perhaps not prevalent.
On the other hand, SOA implementations that implement dynamic services managed by dynamic infrastructures enjoy the ability to also leverage [distributed] event models inherent to the service infrastructures. A consequent robust event model can greatly enhance our ability to *manage* the services themselves and to realize more scale, adaptability and agility - at runtime.
There's another realm of event processing that is bringing tremendous utility to business analysts. Some call it "Complex Event Processing (CEP) for Humans". CEP is being leveraged to correlate events across sources and time - even non-events. Applications of this sort monitor (and/or listen to) myriad sources ( e.g. sensors, databases, feeds, etc.)
The more dynamic the constituent parts of the architecture become, the more proactive and resilient the various functions become that interact with the parts. Additionally, EDA becomes more of a "listening" or "push" activity. This will help reduce "noise" and bandwidth consumption, and will enable more intelligent systems.
I guess the net of my thoughts is that EDA becomes more apparent, relevant and prominent as SOA implementations become more dynamic.
Thank you!
Sam
On 10/3/07, Ken Laskey <klaskey@xxxxxxxxx> wrote: Unfortunately, I've never seen a clear definition of event driven architecture (EDA) and the link below just takes me to a login page. My impression is EDA is use of SOA. Can anyone provide clarification?
Ken
-----Forwarded by Brand Niemann/DC/USEPA/US on 10/03/2007 06:59PM -----
To: "Bob Marcus" <robert.marcus@xxxxxxx>
From: "Bob Marcus" < bobmarcus1@xxxxxxxxxxx>
Date: 10/02/2007 03:24PM
Subject: Proceedings of NCOIC Session on "Event Processing for Net-Centric Operations"
The proceedings for the NCOIC "Event Processing for Net-Centric Operations" session are available as a Zip file at http://home.comcast.net/~bobboulder/EP-Proceedings.zip Let me know if you have any problem downloading the file. Feel free to contact me or the presenters if you have any follow-on questions. Bob Marcus FYI: Event processing is a complementary technology to SOA http://soa-eda.blogspot.com/2006/11/how-eda-extends-soa-and-why-it-is.html There are an increasing number of Event Processing applications (e,g, logistics, intelligence) being deployed by multiple suppliers. However there is a strong need for future standardizations (e.g. reference models, event representations, pattern query languages) which could provide an opportunity for the NCOIC (with customers and collaborators) to influence future directions. An industry Event Processing Technical Society (EPTS) has also been formed to deal with some of these issues.
_________________________________________________________________
----------------------------------------------------------------------------- Ken Laskey MITRE Corporation, M/S H305 phone: 703-983-7934 7151 Colshire Drive fax: 703-983-1379 McLean VA 22102-7508
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_________________________________________________________________ ----------------------------------------------------------------------------- Ken Laskey MITRE Corporation, M/S H305 phone: 703-983-7934 7151 Colshire Drive fax: 703-983-1379 McLean VA 22102-7508
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