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Part One: Envisioning Architecture > A-7E Avionics System: A Case Study in Util...

3. A-7E Avionics System: A Case Study in Utilizing Architectural Structures

An object-oriented program's runtime structure often bears little resemblance to its code structure. The code structure is frozen at compile-time; it consists of classes in fixed inheritance relationships. A program's runtime structure consists of rapidly changing networks of communicating objects. In fact, the two structures are largely independent. Trying to [understand] one from the other is like trying to understand the dynamism of living ecosystems from the static taxonomy of plants and animals, and vice versa.

—E. Gamma, R. Helms, R. Johnson, and J. Vlissides [Gamma 95]

In Chapter 2, we stated that software architecture describes elements of a system and the relations among them. We also emphasized that every system has many kinds of elements and that different architectural structures are useful, even necessary, to present a complete picture of the architecture of a system. Each structure concentrates on one aspect of the architecture.


  

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