c# upc-a Class Implementation Refactorings in C#

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Class Implementation Refactorings
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Change value objects to reference objects. Change reference objects to value objects. Replace virtual routines with data initialization. Change member routine or data placement. Extract specialized code into a subclass. Combine similar code into a superclass.
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Class Interface Refactorings
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Move a routine to another class. Convert one class to two. Eliminate a class. Hide a delegate. Replace inheritance with delegation. Replace delegation with inheritance. Remove a middle man. Introduce a foreign routine. Introduce a class extension. Encapsulate an exposed member variable. Remove Set() routines for fields that cannot be changed. Hide routines that are not intended to be used outside the class. Encapsulate unused routines. Collapse a superclass and subclass if their implementations are very similar.
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System Level Refactorings
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Duplicate data you can t control. Change unidirectional class association to bidirectional class association. Change bidirectional class association to unidirectional class association. Provide a factory routine rather than a simple constructor. Replace error codes with exceptions or vice versa.
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de Complete
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24. Refactoring
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Opening up a working system is more like opening up a human brain and replacing a nerve than opening up a sink and replacing a washer. Would maintenance be easier if it was called Software Brain Surgery Gerald Weinberg
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24.5 Refactoring Safely
Refactoring is a powerful technique for improving code quality. A few simple guidelines can make this powerful technique even more effective.
Keys to Refactoring Safely
Save the code you start with Before you begin refactoring, make sure you can get back to the code you started with. Save a version in your revision control system, or copy the correct files to a backup directory. Keep refactorings small Some refactorings are larger than others, and exactly what constitutes one refactoring can be a little fuzzy. Keep the refactorings small so that you fully understand all the impacts of the changes you make. The detailed refactorings described in Refactoring (Fowler 1999) provide many good examples of how to do this. Do refactorings one at a time Some refactorings are more complicated than others. For all but the simplest refactorings, do the refactorings one at a time, recompile, and retest, then do the next refactoring. Make a list of steps you intend to take A natural extension of the Pseudocode Programming Process is to make a list of the refactorings that will get you from Point A to Point B. Making a list helps you keep each change in context. Make a parking lot When you re midway through one refactoring, you ll sometimes find that you need another refactoring. Midway through that refactoring, you find a third refactoring that would be beneficial. For changes that aren t needed immediately, make a parking lot a list of the changes that you d like to make at some point, but that don t need to be made right now. Make frequent checkpoints It s easy to suddenly find the code going sideways when refactoring. In addition to saving the code you started with, save checkpoints at various steps in a refactoring session so that you can get back to a working program if you code yourself into a dead end.
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24. Refactoring
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Use your compiler warnings It s easy to make small errors that slip past the compiler. Setting your compiler to the pickiest warning level possible will help catch many errors almost as soon as you type them. Retest Reviews of changed code should be complemented by retests. Regression testing is described in more detail in TBD, Developer Testing. Add test cases In addition to retesting with your old tests, add new unit tests to exercise the new code. Review the changes If reviews are important the first time through, they are even more important during subsequent modifications. Ed Yourdon reports that when programmers make changes to a program, they typically have more than a 50 percent chance of making an error the first time (Yourdon 1986b). Interestingly, if programmers work with a substantial portion of the code, rather than just a few lines, the chance of making a correct modification improves. Specifically, as the number of lines changed increases from one to five lines, the chance of making a bad change increases. After that, the chance of making a bad change decreases.
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