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What exactly is service orientation (SO) Any time there s so much hype and buzz about a term, it invariably starts to mean different things to different people. Let s start by dissecting some of the definitions being kicked around out there. A set of components which can be invoked, and whose interface descriptions can be published and discovered. World Wide Web Consortium Standards body for the World Wide Web The statement a set of components is rather vague, as a service may be a set with only a single operation. This definition is very general, almost too general to really capture what service orientation is. Distributed Component Object Model (DCOM) and .NET remoting both seem to meet this definition, even though they re not generally considered implementations of SOA. The final part, stating that the components descriptions can be published and discovered is an important element, one which is common to all of the definitions we ll look at. SOA is an architectural style whose goal is to achieve loose coupling among interacting software agents. Hao He Architect, Thomson Corporation
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Here, Hao He introduces the second thread, that of loose coupling. However, his definition doesn t speak to discovery at all. Discovery and loose coupling are two elements that are very important in service orientation. They both facilitate reuse. This is called out more sharply by the next definition, which likens the level of interoperability to the Holy Grail. SOA is kind of an IT manager s Holy Grail, in which software components can be exposed as services on the network, and, so, can be reused time and time again for different applications and purposes. Preston Gralla Technology Journalist In some larger enterprises, reuse is the Holy Grail of IT, as system integration can be costly and cause a lot of churn. Integration strategies have to be reinvented time and again as a system is integrated with others that may be on disparate platforms. Service orientation allows you to write integration code once and reuse it over and over again, regardless of platform, operating system, or language. Another definition of service orientation is The policies, practices, frameworks that enable application functionality to be provided and consumed as sets of services published at a granularity relevant to the service consumer. Services can be invoked, published and discovered, and are abstracted away from the implementation using a single, standards-based form of interface. David Sprott and Lawrence Wilkes Principal Analysts, Computers by Design, Inc. This definition takes on the W3C (World Wide Web Consortium) definition specifically in the fact that it calls out a set of components. The granularity of the service is independent of the fact that it s a service-oriented implementation. While we can still speak of coarsegrained or fine-grained services, what s important is that the design is relevant to the service consumer. Separating the implementation from interface is first called out here, but it s really just a more concrete invocation of loose coupling. Consumers of a service need a description of that service; they do not need the libraries containing the implementation. In fact, consumers don t even need to be aware of how the implementation is done. It may be .NET; it may be Java; it may be a hundred hamsters on exercise wheels. Consumers care not, just so long as they get SOAP formatted messages back as a response. Finally, the single, standards-based from of interface is a more concrete way of saying interoperable. Rather than explicitly declaring how systems will interact through low-level protocols and object-oriented architectures, SOA provides an abstract interface through which a service can interact with other services or applications through a loosely coupled (often asynchronous), message-based communication model. It can be imagined as an interconnected process-based enterprise that exposes a set of loosely coupled, coarse-grained services. Soumen Chatterjee Senior Consultant, Cap Gemini Ernst & Young
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