IN4MATX 43 Lecture Notes - Lecture 10: Unix Shell, Google Hangouts, Stock Market

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IN4MATX 36900 Intro to Software Engineering
Week 5 Lecture 9 Architectural Styles
Defining Software Architecture
Set of principle design decisions about a system
Architectural Erosion
A system’s prescriptive architecture is modified first when it evolves
o Have a system that is already built, and have a prescriptive architecture
ahead of time to have it be built
o But there is a mismatch between what’s planned and what is to be built
In practice, the system and thus its descriptive architecture is often directly
modified
Why?
o Developer sloppiness
o Short deadlines
o Lack of (documented) prescriptive architecture
o Code optimizations
o Inadequate techniques or tool support
This is unavoidable, but it is still useful to know the original design decisions at a
high level
o The system will more or less conform to the prescriptive architecture
iRODS prescriptive architecture
Architectural styles
Classical
Rock and Roll
Contemporary
Arts and crafts
Comparing contemporary and arts and crafts very different styles
o They have built-in different styles
o What makes a style though?
In the arts and crafts style, there are many elements of windows to
support cross-ventilation
Contemporary has the benefits of windows, as well as varying, non-
symmetrical designs
o In architectural styles, there are elements that constrain what you can do
while abusing those elements for your benefits
Software architectural style
A named collection of architectural design decisions that
This is a bit similar to the music and buildings architecture above
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