Saturday, July 16, 2005

 

Thinking out of the Box

Don Box has apparently taken the high ground on the BOA acronym. How could I have forgotten Business Oriented Agents? I just hope my previous post on Document Oriented Architectures, doesn't violate any of Don's Other Acronyms (DOAs). Also my apologies to the CORBA crowd, where BOA means Base Object Adapter. I guess there are just not enough TLAs to go around!

Tuesday, July 05, 2005

 

SOA is a design philosophy

SOA is a design philosophy, not a technology or a methodology

John Evdemon

A service oriented design philosophy views an application as a collaboration of more basic core services. A Service Oriented Architecture (SOA) is an ensemble of such services.

Services are best explained as centers of value. (a’la Christopher Alexander). Paraphrasing Alexander, services are building blocks of business capability, not truly bounded entities but are in fact non-bounded centers. Here, “non-bounded” refers to their implementation. From outside its interface, a service is a black box of unknown scope and complexity.

Service interfaces are bound by a platform independent contract. Services protect information and form trust boundaries within an Enterprise Architecture.

I agree with Martin Fowler that Service Oriented design philosophy is often confused with service interface implementations (Martin Fowler)

A service is a program.
A web service is a communication tool.

Clemens Vasters


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