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Data Services Layer and Its Role in SOA: Principles, Boundaries, Contexts and Possibilities
CareFirst Blue Cross Blue Shield's Mark Davydov to Present at SYS-CON's SOA World Conference & Expo, June 23-24, in NYC

By: SOA World Magazine News Desk
May. 19, 2008 09:15 AM

The ever-increasing movement towards implementing complex SOA-based applications has triggered a direct attention of leading industry researchers and practitioners to the subject of layering in such applications, in general, and the relationship between the fields of database engineering and SOA, in particular. Common notion of interoperability, loose-coupling between consumers and providers, and complexity-hiding, and demands for enabling extensive reuse of application services to address unforeseen business requirements for new user types, for new types of information and for new composite views has brought to the forefront the concept of Data Services Layer (DSL) as a distinct architectural layer. DSL is an essential part of an application architecture that combines data access functions and corresponding database structures and promises ensuring the next harvest for SOA ROI.

This presentation thoroughly examines the concept of DSL from an architectural and development perspective to reveal significant principles, context, and interrelationships that, in turn, allows focusing on patterns, best practices, design strategies, and proven solutions using the key technologies including semantic models of XML data, XQuery, and popularized SOA-driven commercial and open source database implementations that moved aggressively toward explicit support of SOA, for example, Microsoft SQL Server 2005, IBM DB2 Viper, XAware Open Source 5, and Apache Tuscany.

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Speaker Bio: Mark M. Davydov is an internationally recognized expert on software architecture, and software evolution and reuse. Dr. Davydov is the author of over 100 highly acclaimed articles in industry leading publications and vendor technical forums such as IBM developerWorks and Oracle Technical Network. His 2001 book "Corporate Portals and e-Business Integration - A Manager's Guide", introduced many ideas that influenced the progression of Service-Oriented Architecture and the Web Services model. He is a frequent presenter and panel participant at international conferences on software architecture and service-oriented computing, e.g., ICSOC04, WICSA 2004, FinanceCom05, ECIS 2005, WEBIST 2006, etc.

Dr. Davydov is Director of Systems Development at CareFirst Blue Cross Blue Shield and technology advisor to several industry consortiums such as Connected Health and HL7. Dr. Davydov did his graduate work in applied informatics at the State Academy of Chemical Engineering, and received post-doctoral training in computer science at the Karpov Scientific and Research Institute of Physical Chemistry, both in Moscow, Russia.

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To inquire about sponsorship and exhibit opportunities please contact Carmen Gonzalez at 201-802-3021 or by email at events(at)sys-con.com. Currently, a limited number of sponsorship and exhibition packages with multiple sponsorship discounts are available for the following international events:

13th International SOAWorld Conference & Expo 2008 - East
June 23-24, 2008, New York City (www.soaworld2008.com)

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January 26-27, 2009, London, England

The Most Distinguished SOA Faculty at the Upcoming
June 23-24, 2008 Conference in New York City
SYS-CON’s upcoming “13th International SOAWorld Conference & Expo” faculty includes such distinguished speakers as: Al Aghili (Managed Methods), Andi Mann (Enterprise Management Associates), Ariel Cohen (Xsigo Systems), Ben Rudolph (Parallels), Bob Lozano (Appistry), Bob Quinn (3Leaf Systems), Brian Martin (IBM), Carlo Innocenti Ph.D. (DataDirect Technologies), Chris Shayan (Ashna Samane), Doc D'Errico (EMC Corporation), Domenic Alcaro (APC), Donato Buccella (Certeon), Etay Bogner (Neocleus), George Pradel (Vizioncore), Geva Perry (GigaSpaces), Glen Daniels (WSO2), Gordon Hunt (Real-Time Innovations), Gordon Jackson (DataSynapse), Gregory Brail (Sonoa Systems), Harry Petty (Brocade), Hubert Yoshida (Hitachi Data Systems), Ian Thain (Sybase), Jacek Kruszelnicki (Numatica Corporation), Jeremy Geelan (SYS-CON Media), Joe McKendrick (WebServices.org), John Goodson (DataDirect), John Senor (iWay Software), JP Morgenthal (GXS), Keith Swenson (Fujitsu), Ken North (Computing, LLC), Kenon Owens (VMware), Kevin Epstein (Scalent Systems), Koen Aers (Red Hat/JBoss), Kyle Gabhart (Web Age Solutions), Mario Dal Canto (SIMtone), Mark Davydov Ph.D. (Blue Cross Blue Shield), Mark Hapner (Sun Microsystems), Mark Milligan (VirtualLogix), Matt George (Fidelity Investments), Michael Carey Ph.D. (BEA Systems), Michael Gorman (Whitemarsh Information Systems), Mike Pizzo (Microsoft), Miko Matsumura (Software AG), Nikita Ogievetsky (Morgan Stanley), Paul Lipton (CA), Paul Rivot (IBM), Peter Manca (Egenera), Phil Morris (Sun Microsystems), Pierre Fricke (Red Hat / JBoss), Ravi Gururaj (VMLogix), Rich Lechner (IBM), Rich Schreiber (Nastel Technologies), Richard Mark Soley (OMG), Robert Steward (DataDirect), Ron Williams (Tivoli Software), Sean Derrington (Symantec), Shai Fultheim (ScaleMP), Simon Crosby (Citrix), Stephen Herrod (VMware), Stephen Pollack (PlateSpin), Tom Bishop (BMC Software), Tom Woteki (Cisco), Ursula Sinkewicz (Fidelity Investments), Vern Brownell (Egenera), Victoria Livschitz (Grid Dynamics), Yakov Fain (Farata Systems), Zoran Cakeljic (Virtual Iron).

Published May. 19, 2008— Reads 3,363
Copyright © 2008 SYS-CON Media. All Rights Reserved.
About SOA World Magazine News Desk
SOA World Magazine News Desk (formerly Web Services Journal) trawls the world of distributed computing and SOA-related developments for the latest word on technologies, standards, products, and services and brings key information to you in a timely and convenient summary form.

YOUR FEEDBACK
Jeff McCabe wrote: As far as Flash goes... I've been thoroughly disappointed with Adobe since the purchase of Macromedia's wonderful software. With all of these new versions, features, and security protocols, it has become a dead-end app. The entire point of the prgm was to be able to deliver high-end apps over the web with maximum compatibility. Now, with the advent of the latest security protocols, it is nearly impossible to give users access to websites that communicate internally with flash applications. I can't embed a flash app on my organization's webpage because only high-end users will know what to do when the software prompts them to add a URL in their "sandbox." Bah! to Adobe for spoiling good software. Hooray for marketing for stepping up ColdFusion as a solution, though. Which brings me back to Bah! to pricing schemes. I guess that's how Adobe is funding their MM purchase?
anonymous wrote: We have an AJAX app used by 55,000 corporate users all over the world. Never had a problem with Javascript support. Works great.
Michael Avrukin wrote: Have you looked at the SpryFramework from Adobe? It addresses some of the issues you've brought up http://labs.adobe.com/technologies/spry/
Jeff McCabe wrote: I agree that these issues need to be addressed. I think everyone is just waiting for the next person to think of a solution to these issues.
Jeff McCabe wrote: I agree that these issues need to be addressed. I think everyone is just waiting for the next person to think of a solution to these issues.
Shahzad Badar wrote: I think Mr Coach Wei would be right for his points but as he mentioned that 10% browsers stopped javasscript support then why for 10% we should ignore 90%.and if AJAX got attention 10% will be forced to add javascript support as happened with java. second, i think AJAX is going to be matured day by day so developer cummunity will be trying to create such functionalities through AJAX and I think its not a big deed.
Ivan Handler wrote: As someone responsible for creating business applications for state government, I don't see these problems as significant. Many of our applications go through offices where we either control the technology or can specify the requirements for users who wish access to our applications. Making sure javascript is turned on is a fairly mild requirement as is IE 6.0+, FF 1.5+, etc. I think the problems may be more significant for those trying to write pages that are somehow "universal." I am not very sympathetic to this in the first place since the web is already too big to allow for anything approaching that anyway. This is where it is important to know your market, understand how to serve the largest segment you can. There are many people who are going to limit their browsers for a variety of reasons. Accept it and move on. If what becomes available via Ajax (such as all of the G...
obinna kalu wrote: Here is my thought about the first "big" issue raised in this article, that AJAX adopters need to worry about. Firstly, permit me to say the issue does not count as a BIG issue. oh Yes, it is something to consider when choosing to implement an AJAX-style web application. However, it isn't that much of a big issue that should greatly influence the decision whether to do AJAX or not. It is like thinking that, since some % of people do not have computers or internet access then businesses should not bother putting-up e-commerce systems. oh no, sir. Any web app today that is worth spending a dime on, will be doing a deservice to its users if it is not AJAX-style or similar technique (i.e. any that sends across as much client-side code as possible/reasonable - java applet, java app delivered via jumpstart, adobe flex, laszlo etc) and is still doing the old click-and-wait-for-whole-page-reload...
Tal Cohen wrote: The 10% number is entirely not credible. Practically all visitors of that site (w3schools) are developers, who are advanced users that know how to turn off JS by default and enable it selectively where needed (esp. with FireFox extensions that make it trivial). Note that the same stats page specifies that 1 in 4 users browses with FireFox -- how credible is that!?
Tal Cohen wrote: The 10% number is entirely not credible. Practically all visitors of that site (w3schools) are developers, who are advanced users that know how to turn off JS by default and enable it selectively where needed (esp. with FireFox extensions that make it trivial). Note that the same stats page specifies that 1 in 4 users browses with FireFox -- how credible is that!?
Tal Cohen wrote: The 10% number is entirely not credible. Practically all visitors of that site (w3schools) are developers, who are advanced users that know how to turn off JS by default and enable it selectively where needed (esp. with FireFox extensions that make it trivial). Note that the same stats page specifies that 1 in 4 users browses with FireFox -- how credible is that!?
Will Merydith wrote: Your whole issue is wrapped around the 10% that have Javascript turned off? That not number is insignificant in terms of hindering adoption.
Paul Davis wrote: I find it ironic that "10%" of people can turn off JavaScript, but the population as a whole can't figure out how to install a Flash plugin (which is freaking automatic...) because "Techies can do it but i doubt normal computer users will be able to do that" - I hardly think those normal people can turn off JavaScript or even know where/how/what to do to do so. Either it is someone who has a disability and JS simply makes it impossible for them to access the web - or it is corporate IT or it is paranoid throwbacks from early web day geeks. Beyond the accessability issue, it doesn't matter. As for making it accessable, preplanning can do that and it isn't that difficult. Both of your issues aren't relevant enough to pull back on Ajax, especially the 10% turned off javascript line, it is like a sure sign you're position is lacking any real meat.
Robert McDaniels wrote: "Flash is probably somewhere 80%-90% coverage out of box." Do you have any facts or references that support this? "the marketing message from Adobe about 'Flash covers 97% browsers' is not credible, given that no new PC, or browser, comes with Flash" Flash downloads are driven by content. Many of the most popular sites on the web (Google Video, YouTube, etc.) offer Flash content that drives downloads. "you have to download and install Flash on your own. Techies can do it but i doubt normal computer users will be able to do that" The Flash install is approx 1MB, a non-issue for even dial-up users. The install takes place right in the browser in seconds. Some IE users may have to enable ActiveX controls (which the browser prompts them to do). There is nothing technical about installing Flash. Even the authors unsupported estimates of an install base support that it is no problem for...
Derrick wrote: I disagree. Don't worry about the 10% that have JavaScript turned off. Just keep producing compelling new RIA web apps that require AJAX. You got to make the slackers feel like they're being left behind at the train station. That's the only way they'll ever get around to enabling JavaScript and joining the 21st century.
John Stone wrote: Learn English first, then write an editorial.
Agile Ajax wrote: Trackback Added: AJAX and the Network Effect; Via Ajaxian, Coach Wei over at AjaxWorld Magazine has an article expressing reservations about AJAX and what might hinder it's adoption: 1. 10% browsers have Javascript support turned off (see statistics at http://www.w3schools.com/browsers/browsers_stats.asp). It means that 10% users can not
Agile Ajax wrote: Trackback Added: AJAX and the Network Effect; Via Ajaxian, Coach Wei over at AjaxWorld Magazine has an article expressing reservations about AJAX and what might hinder it's adoption: 1. 10% browsers have Javascript support turned off (see statistics at http://www.w3schools.com/browsers/browsers_stats.asp). It means that 10% users can not
Rajgopal wrote: The single biggest problem that preventing wide spread Ajax adoption is lack of simple and complete solutions to build Ajax or Rich Internet applications. This webpage makes fun of the situation and proposes a simple solution. http://www.cbsdf.com/ps_blog/why-other-frameworks.htm http://www.cbsdf.com/technologies/DHTML-Widgets/Widget-samples.htm What do you think?
Becky Gibson wrote: There is work going on the make the Dojo widgets accessible. The Dynamic Web Content Accessibility Techniques (http://www.w3.org/WAI/PF/#roadmap) which provide full keyboard and screen reader support are being applied to the widgets.
ENTERPRISE OPEN SOURCE MAGAZINE LATEST STORIES . . .
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Three-letter acronyms (TLAs) are hardly new in Information Technology: EAI, ESB, SOA, BPM, BAM, ETL, MDM; the list goes on and on. This article is about yet another three-letter acronym, EDA, which stands for Event-Driven Architecture. EDA is not a brand new technology, but rather a pr...
By Theresa Bui-Friday
Imagine the CIO of a consumer bank who thinks he is running 50 Oracle databases, but now finds out that in fact he has 100 databases installed behind his firewall. He doesn't have any idea where the other 50 came from. He doesn’t know the name of the vendor(s) supporting them. And he...
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