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has been improved, it will be easier to maintain Software maintenance usually has one of two goals The first is to fix bugs, and the second is to add features While the goal of refactoring is neither of these, it can greatly improve how easy it is to do either At first it may seem a waste to refactor code without adding any new functionality, but trying to modify a poorly constructed program can take far more time and effort than first refactoring, and then modifying Refactoring can reveal flaws in the structure of the existing code that are the underlying causes of bugs or incorrect behavior Ward Cunningham and Kent Beck were two of the first software experts to recognize the importance of refactoring, and to help develop it into a formal technique The principle refactoring resource is Refactoring, Improving the Design of Existing Code by Martin Fowler While refactoring can be useful for almost any kind of objectoriented programming, it is an essential part of the eXtreme Programming (XP) methodology (see 9)
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Refactoring should be considered a basic principle of programming, and does not require any special methodology Refactoring can improve the design of existing code Over time, as code is changed, it tends to deteriorate Changes are often made on the fly, under time pressures, without regard for the overall structure of the code This can lead to code entropy Refactoring can help undo code entropy The Basic Refactoring Process While the basic refactoring process is not that complicated, experience with programming helps (especially object-oriented programming) The main goal of refactoring is to improve the overall
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design and structure of an existing program without changing its observable behavior This means that you don't refactor and add functionality at the same time Once the refactoring has been done, it will be easier to add functionality The first step of refactoring is to start to understand the existing code, usually by reading the code As part of this process, you will almost certainly find problems with the code that can be improved Refactoring isn't just about finding problems and making small improvements to code It is a well-defined and structured technique for improving the code Each individual refactoring may make only a small difference, but the cumulative effect of applying many refactorings can result in greatly improved overall quality, readability, and design of the code
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The developers of refactoring have identified a list and descriptions of known refactorings that can help improve code Many of these refactorings are listed and described in Martin Fowler's Refactoring book, and more can be found on the refactoring web site at wwwrefactoringcom As you become experienced with refactoring, the many specific refactorings will become familiar, and you will start to recognize cases in code that can benefit from refactoring
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Any time you change code, it is risky You can introduce new bugs You can change the behavior of the program You can break things By using disciplined refactoring, you can reduce the risk of making changes This is one of the major differences between a simple code clean up and the formal refactoring process By carefully following the refactoring process, you reduce the risk of making changes to code, while at the same time improving its design and making it
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One of the first rules of refactoring is that you do not change functionality of the existing code By functionality in this context, we mean the outside observed behavior of the code The program should behave exactly the same before and after the refactoring If the behavior changes, then it will be impossible to know for sure that the refactoring hasn't broken other things as well If you need to change the behavior, do that as a separate step Improve the code with refactoring, then make the change
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