By Joost Visser, Sylvan Rigal, Rob van der Leek, Pascal van Eck, Gijs Wijnholds
Have you felt annoyed operating with anyone else's code? Difficult-to-maintain resource code is a huge challenge in software program improvement at the present time, resulting in expensive delays and defects. be a part of the answer. With this useful e-book, you'll study 10 easy-to-follow instructions for providing Java software program that's effortless to take care of and adapt. those directions were derived from studying enormous quantities of real-world systems.
Written by way of specialists from the software program development crew (SIG), this ebook presents transparent and concise reasons, with recommendation for turning the information into perform. Examples for this version are written in Java, whereas our spouse C# publication presents manageable examples in that language.
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Extra resources for Building Maintainable Software, Java Edition
Martin Fowler Guideline: • Limit the length of code units to 15 lines of code. • Do this by not writing units that are longer than 15 lines of code in the first place, or by splitting long units into multiple smaller units until each unit has at most 15 lines of code. • This improves maintainability because small units are easy to understand, easy to test, and easy to reuse. Units are the smallest groups of code that can be maintained and executed independ‐ ently. In Java, units are methods or constructors.
It is equally possible to write short units. Our experience is that 15 lines of properly formatted code is enough to write useful units. As proof, Table 2-1 presents some data from a typical Java 2 Enterprise Edition sys‐ tem, consisting of Java source files but also some XSD and XSLT. The system, cur‐ rently in production at a SIG client, provides reporting functionality for its owner. The Java part consists of about 28,000 lines of code (a medium-sized system). Of these 28,000 lines of code, just over 17,000 lines are in units.
So, if you are faced with a unit that seems impossible to refactor, do not ignore it and move on to another programming task, but indeed raise the issue with your team members and team lead. When a refactoring seems possible but doesn’t make sense, rethink the architecture of your system. ” Actually, it does, provided you choose better names than doSomethingOne, doSome thingTwo, and so on. Each of the shorter units is, on its own, easier to understand than the long doSomething. More importantly, you may not even need to consider all the parts, especially since each of the method names, when chosen carefully, serves as documentation indicating what the unit of code is supposed to do.
Building Maintainable Software, Java Edition by Joost Visser, Sylvan Rigal, Rob van der Leek, Pascal van Eck, Gijs Wijnholds