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Service autonomy principle
Service autonomy is a design principle that is applied within the service-orientation design paradigm, to provide services with improved independence from their execution environments.〔Wojciech Cellary,Sergiusz Strykowski.(E-Government Based on Cloud Computing and Service-Oriented Architecture )().Date accessed: 17 April 2010.〕 This results in greater reliability, since services can operate with less dependence on resources over which there is little or no control.
==Purpose==
The service-orientation design paradigm emphasizes service reuse as dictated by the service reusability design principle. Under this paradigm of a heavily reused services, reliability becomes critical to ensure service longevity. In turn, service reliability depends on the service's operational control of service logic and underlying implementation resources to reduce dependence on external resources over which it has little or no control such as shared service logic or a shared database, which may not be available when required by the service.
Traditional component-based software development also faces the same autonomy requirements, the provisioning of autonomy and reliability, in such circumstances, is left to the actual run-time environment e.g. by providing fail-over support or by deploying a solution on dedicated servers. However, within service-orientation, the stakes are even higher as a service-oriented solution can be composed of services〔(Service Composition )〕 that exist outside of the organizational boundary. So in this case, it’s the design of the service itself that matters and the service needs to be designed in a way that it exercises maximum control over how it fulfills its functionality. The service autonomy principle attempts to provide guidelines for designing autonomous services so that the resulting services are more predictable and reliable.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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