Web Services Strategies
Beyond the technology, IT strategies for implementation of Web services by Doug Kaye.
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BPEL4WS vs. WSCI. According to John Taschek in eWeek, the battle for a web-services choreography specification is over, with BPEL4WS having been declared the winner over WSCI. John says WSCI "...was officially left stranded when Microsoft, IBM and BEA released BPEL to OASIS in mid-April, this killing any competing choreography standard."
Posted Sunday, May 11, 2003 8:57:48 PM 
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More Confusion. I don't want to pick on anyone in particular, but this article in the Australian Computerworld is typical of the misunderstandings that are still being propagated by the uninformed press regarding SOAs and loose coupling. Let's see if I can help...
- Service-oriented architectures (SOAs) are not necessarily built from "components." Components are a concept from OOP. Perfectly good services can be built from non-object oriented scripting languages, for example.
- Components are not necessarily loosely coupled. The concepts are orthogonal.
- Swapping components to achieve the re-use of code is not the same thing as interchangeable services, which achieve re-use at the service level.
- Event-driven architectures (EDAs--the topic of the Computerworld article) are also orthogonal to SOAs. EDAs don't replace SOAs. It's not an either/or thing. Services can be event-driven (asynchronous) or not (synchronous).
- EDAs are tied to asynchronous processing and messaging, and in that sense (i.e., in the dimension of time) EDAs are loosely coupled.
According to the article, Roy Schulte of Gartner expects the emergence of standards for event processing to appear beginning in 2005 and for complex event processing (CEP) systems to become mainstream in 2007. (I predict 2004 for the former, but I have a track record of being overly optimistic about such things.) David Luckham, a co-founder of Rational Software and author of Power of Events, predicted that CEP "will start creeping into web services, middleware and application servers in 2005. By 2008, he foresees the emergence of CEP standards, languages and complex event-pattern search engines. Ubiquity of CEP will come in 2012, he forecasted."
Posted Sunday, May 11, 2003 6:14:04 PM
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