Introduction to
Service-Orientation
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Service-Orientation
Design Principles
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Effects of Service-Orientation on the Enterprise
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Service-Orientation
in the Real World
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Service-Orientation Design Principles
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Service Abstraction
"Service contracts only contain essential information and information about services is limited to what is published in service contracts."
Abstraction ties into many aspects of service-orientation. On a fundamental level, this principle emphasizes the need to hide as much of the underlying details of a service as possible. Doing so directly enables and preserves the previously described loosely coupled relationship. Service Abstraction also plays a significant role in the positioning and design of service compositions.
Various forms of meta data come into the picture when assessing appropriate abstraction levels. The extent of abstraction applied can affect service contract granularity and can further influence the ultimate cost and effort of governing the service.
Figure: The level of suitable abstraction can be closely related to the nature of the logic being encpasulated by the service.
Chapter 8: Service Abstraction (Information Hiding and Meta Abstraction Types) covers various aspects of applying abstraction to different types of service meta data, along with processes and approaches associated with information hiding.
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