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enterprise services (operating system and virtualization)

 
Ronald Wouters
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Hi all,

in Section 1: Application Design Concepts and Principles of Part I, it says
Describe how the principle of "separation of concerns" has been applied to the layers of a Java EE application. Layers include application, virtual platform (component APIs), application infrastructure (containers), enterprise services (operating system and virtualization), compute and storage, and the networking infrastructure layers.


I can understand virtualization being called an enterpise service, but why would you consider the operating system itself as a "service" ?

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giuseppe fanuzzi
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Operating systems are the base software for the infrastucture of your app.
In a layered organization of your system they stay in the lower layer, together with db, specific hardware interface, and so on
 
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