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| Enterprise Service Layer ： ウィキペディア英語版 |
Enterprise Service Layer
In a service-oriented architecture business software implementation, the Enterprise Service Layer (ESL) is the highest level of abstraction.〔Service Availability: Second International Service Availability Symposium ...b Miroslaw Malek, E. Nett, Neeraj Suri, page 103〕
Any application programming interface (API) defined at the ESL can cross domain boundaries; it calls directly the Domain Service Layer, which in turn interacts with the Application Service Layer or the RDBMS Service Layer. Therefore, any API which must access multiple domains to execute correctly must exist at the enterprise level.〔The Definitive Guide to SOA: BEA AquaLogic Service Bus, by Jeff Davies, Ashish. Krishna, David. Schorow, page 214〕
Since the ESL is the API of the entire enterprise, all the components in the enterprise can call it directly, and it can sometimes be accessed from outside the service-providing entity.〔Service Availability: Second International Service Availability Symposium ...b Miroslaw Malek, E. Nett, Neeraj Suri, page 103〕
ESL exposes a number of API considerably lower than the ASL because it works at a higher level of abstraction than the ASL.
== References ==
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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