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Alarming Symptoms
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The big ball of mud doesn t get formed overnight. How can you detect that your system is deteriorating There a few hard-to-miss symptoms you don t want to ignore. They are very serious. Let s find out what they are.
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Make a Change Here, Break the Code There
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Can you bend a piece of wood And what do you risk if you insist on trying to do that A piece of wood is typically stiff and rigid and characterized by some resistance to deformation. When enough force is applied, the deformation becomes permanent. What about rigid software
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Part III Design of the Application
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Rigid software is characterized by some level of resistance to changes. Resistance is measured in terms of regression. You make a change in one module, but the effects of your change cascade down the list of dependent modules. As a result, it s really hard to predict how large the impact of a change any change, even the simplest will actually be. If you pummel a glass or any other fragile material, you succeed only in breaking it down into several pieces. Likewise, when you enter a change in software and cause it to misbehave in some places, that software is definitely fragile. Just as fragility and rigidity go hand in hand in real life, they also do so in software. When a change in a software module breaks (many) other modules because of (hidden) dependencies, you have a clear symptom of a bad design, and you need to remedy that situation as soon as possible.
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Easier to Use Than to Reuse
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Imagine you have a piece of software that works in one project; you would like to reuse it in another project. However, copying the class or linking the assembly in the new project just doesn t work. Why is this so If the same code doesn t work when it s moved to another project, it s because of dependencies. However, the real problem isn t just dependencies; it s the number and depth of dependencies. The risk is that to reuse a piece of functionality in another project, you ll have to import a much larger set of functions. In such cases, no reuse is ever attempted and code is rewritten from scratch. (Which, among other things, increases duplication.) This also is not a good sign either for your design. This negative aspect of a design is often referred to as immobility.
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Easier to Work Around Than to Fix
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When applying a change to a software module, it is not unusual that you find two or more ways to do it. Most of the time, one way of doing things is nifty, elegant, coherent with the design, but terribly laborious to implement because of certain constraints. The other way is, instead, much smoother and quicker to code, but it is sort of a hack. What should you do Actually, you can solve the problem either way, depending on the given deadlines and your manager s directives about it.
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13 Principles of Software Design
In summary, it s not an ideal situation because a workaround might be much easier to apply than the right solution. And that s not a great statement about your overall design either. It simply means that too many unneeded dependencies exist between classes and that your classes do not form a particularly cohesive mass of code. This negative aspect of a design is often referred to as viscosity. So what should you do to avoid these symptoms showing up in your code and creating a big ball of mud
Universal Software Principles
In my opinion, maintainability is the fundamental attribute of modern software. The importance of maintainability spans the technology spectrum and applies to the Web as well as desktop applications. A few universally valid design principles help significantly to produce code that is easier to maintain and evolve. It is curious to note that they are all principles devised and formulated a few decades ago. Apparently, for quite some time we ve had the tools to build and manage complex software but real applications were just lacking the complexity to bring them to the forefront as design best practices. This is also my interpretation of the advent of the Rapid Application Development (RAD) paradigm a decade ago, which complemented (and in some cases superseded) object-oriented programming (OOP). Today, the situation is different. With large companies now taking full advantage of Internet, cloud, and mobile computing, developers and architects are swamped with an incredible amount of complexity to deal with. That s why RAD is no longer sufficient in many scenarios. On the other hand, not everybody is skilled enough to use OOP. It s about time we all rediscover some fundamentals of software programming regardless of the type of application we re building. Summarizing, I would boil software principles down to two principles: the High Cohesion and Low Coupling principle and the Separation of Concerns principle.
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