When to Use Patterns What Makes a Pattern a Pattern? Case Study ...
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When to Use Patterns What Makes a Pattern a Pattern? Case Study ...
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OO Patterns
Douglas C. Schmidt
OO Patterns
Douglas C. Schmidt
When to Use Patterns
What Makes a Pattern a Pattern?
1. Solutions to problems that recur with variations
A pattern must: Solve a problem,
No need for reuse if the problem only arises in one context
– i.e., it must be useful!
2. Solutions that require several steps
– It must provide sufficient understanding to tailor the solution
Have a context,
Not all problems need all steps Patterns can be overkill if solution is simple linear set of instructions 3. Solutions where the solver is more interested in the existence of the solution than its complete derivation
– It must describe where the solution can be used
Have a name
Recur,
– It must be referred to consistently
– It must be relevant in other situations
Patterns leave out too much to be useful to someone who really wants to understand – They can be a temporary bridge, however 24
Vanderbilt University
25
www.cs.wustl.edu/ schmidt/PDF/DSEJ-94.pdf
www.cs.wustl.edu/ schmidt/PDF/ECOOP95.pdf
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Vanderbilt University
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Vanderbilt University
OO Patterns
Elements of Reusable Object-Oriented Software Gang of Four
concurrency and I/O models – e.g., different Michael Mamehoff's "GoF Design Patterns: Rapid Learning Tips" Thus, it may be impractical to directly reuse: http://mahemoff.com/paper/software/learningGoFPatterns/
OO framework for Call Center Management
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OS platforms are often fundamentally incompatible
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System Overview
Object-Oriented Design & Patterns, Cay Horstmann Developing portable, reusable, and efficient communication software is hard Slides and examples: http://horstmann.com/design_and_patterns.html
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Case Study: A Reusable Object-Oriented Communication Software Framework
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Introduction to Patterns and Frameworks, Douglas C. Schmidt OO Patterns Douglas C. Schmidt http://www.cs.wustl.edu/~schmidt/PDF/patterns-intro4.pdf
