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Understanding Service-Oriented Architecture

  • July 8, 2005
  • By Michael Stevens
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Software architecture has been emerging as a discipline over the last decade (Garlan 2000). A system's software architecture describes its coarse-grained structures and its properties at a high level. As long as the technology supports those structures and properties, the technology can be considered to implement the architecture. For instance, Jini is a technology that supports service-oriented architecture, because it supports the properties of SOA.

It is important to apply the concepts of software architecture to any new technology to take full advantage of it. Service-oriented architecture is implemented by technologies other than Web services, but the term and concepts have gained popularity recently because of Web services. For instance, the computer industry has used the term service for about two decades to describe various platforms.

Some of the characteristics of service-oriented architecture are supported better by certain technologies than by others. For instance, CORBA and Jini are less interoperable than Web services, but Jini excels in other properties (though this is arguable), such as discovery.

Interface design is perhaps the most difficult part of designing services in service-oriented architecture. The modularization techniques practiced for decades still apply to services. Service design is even more difficult, because the domain a service supports is not limited to a single application. Therefore, it is best to perform modularization starting with a conceptual model of the business rather than of a single application. If the interface design is done well, the services are more likely to be reusable in other applications, and organizations will realize a higher return on their investment.

Web services are refocusing organizations on the concepts of service-oriented architecture. Although highly reusable, loosely coupled architectures have been a goal for many organizations. Web services are fostering interest in and providing the technology to implement service-oriented architectures that enable them to realize their vision.


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