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Pattern Refactoring

Метки: python

Note

This chapter has not had any significant translation yet.

This chapter will look at the process of solving a problem by applying design patterns in an evolutionary fashion. That is, a first cut design will be used for the initial solution, and then this solution will be examined and various design patterns will be applied to the problem (some of which will work, and some of which won’t). The key question that will always be asked in seeking improved solutions is “what will change?”

This process is similar to what Martin Fowler talks about in his book Refactoring: Improving the Design of Existing Code [#]_ (although he tends to talk about pieces of code more than pattern-level designs). You start with a solution, and then when you discover that it doesn’t continue to meet your needs, you fix it. Of course, this is a natural tendency but in computer programming it’s been extremely difficult to accomplish with procedural programs, and the acceptance of the idea that we can refactor code and designs adds to the body of proof that object-oriented programming is “a good thing.”