Shey’s Rebellion

My copy of Patterns of Enterprise Application Architecture came in today– I’m reading it at 4:30 in the morning thinking, "see! I’m not crazy!"

I’ve always considered Software Developers to be a special breed.  Good software developers are driven– they set aside time to hone their technique and learn new methods and technologies, they strive to do better.

If this sounds like you, then read on:  I’m trying to form study group of programmers who are interested in studying software development.  The group would meet once or twice a month to present new ideas, discuss technology related articles and read and refactor code.   

The main focus of the group would be Object oriented programming and design; initially I would like to cover topics such as ORM, Domain Driven Design and Inversion of Control.

Obviously this is for Karachi only, if you’re still interested drop a note in the comments.

As a software developer, I have unintentionally surrounded myself with other software developers who share the same ideals as myself. If you asked any them if good design is worth the effort, they will answer with an unequivocal yes!  They may ask “How can you question design?  It is the heart of software development.”

Project managers will stand behind us, nodding in agreement, because no project manager is brave enough to openly say that design isn’t a worthwhile activity, instead they’ll rephrase their disagreement: “We have a deadline approaching and we need to get this functionality out of the door fast!” A dangerous phrase which means they want you to churn out code as fast as you can without regard to future costs.

Software developers use the term “Technical Debt” to describe the obligation an organization incurs when it chooses a design or approach that’s quicker in the short term but increases complexity of the software and is more costly in the long term. 

Imagine, skipping the dishes after dinner, instead of washing them you let them pile up in your sink, you’ll save time now, but eventually, you’ll have a huge mess in your kitchen and you won’t have any dishes to eat on. Even worse, imagine that your in-laws drop in on a surprise visit and you don’t have any dishes to serve them food on—these imaginary in-laws are clients asking you for new functionality.

Technical debt prevents you from meeting your customer’s needs quickly, modifications to the code base take exponentially longer and as your technical debt accumulates you expose yourself to more risk.

Sometimes, just like financial debt, it is beneficial to take on technical debt to exploit an opportunity, but like credit card debt, the interest on technical debt can catch up on you, all too often we don’t manage our debt, it spirals out of control and we spend most of the our money paying of the interest, not the principle.

Software development is a series of compromises, but we can’t fool ourselves into believing that we can trade good design for greater development speed.

The problem with sacrificing design is that the code becomes unstable, adding a feature will break the software in other places; the code becomes to modify, a simple change requires modifying other parts of the system and finally, the code becomes harder to read, developers spend days trying to figure out which files need to change.  Eventually, your developers will become frustrated and they’ll start proposing the big rewrite of the system.

Development in the absence of design yields systems which have a high level of coupling, where functionality is spread across the entire application and often duplicated in several locations across the code base.

As the application evolves, these duplicate functions become unsynchronized, making bug fixes more difficult and time consuming. Maintaining a code base with high coupling is difficult and time consuming, your developers waste time looking for the code to modify searching for the duplicate code in ten different files, instead of developing new functionality; they waste time re-understanding the code. All of these problems compound to make maintenance and further development extremely expensive.

Programmers are lazy and if good design actually increased the effort and time required we’d be against it.  Software design is an effortful activity, but one which leads to a net increase in productivity and efficiency.

For software to remain relevant and profitable, it must change often, add value by growing in features, if your code is brittle and fragile, then adding new features to your application is difficult, eventually you’ll have to turn away customers because you can’t meet their requirements in time. Extrapolate this over five years and imagine the profit you had to forgo because your code is unstable.

Good design ensures functionality is confined to a single location, it encourages code reuse, makes maintenance easier and it makes it easier to add new features, in short good design saves you money.