DESIGN

High Cohesion, Loose Coupling

TheBojan, , , , , , , , 18 Comments

We are living in a time where businesses and the people running them often change their mind. I won’t be gong into details of why is that so, let’s just say it is a given, and let’s say they are right. It gives them the competitive edge when they are flexible. It is on us to provide that. We are witnessing a high demand for a maintainable software, software that can change easily over time, and where the most of the effort measured in time and people’s work on projects happens after the initial release…long after the initial release if you’re happy. Needless to say, if we want to software to succeed in the long run, we must set our own mindset towards a way, that will provide the businesses their much needed value in that long run.

I know the following is a bold statement, but, you cannot say this enough so that it doesn’t become true.

There is no silver bullet in software development.

The only thing that separates the good software from the bad one is the value of the software for the business at that particular point in time. In order to prolong the value of the software for a long period of time you have to make it respond easier to change.

How you achieve that is a completely different matter. It borderlines with art and being able to predict the future. But, the good thing is that there are a few guidelines that you can follow that can help you out.

Here, I try to put some light on two of those: cohesion and coupling….Read on…

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High Cohesion, Loose Coupling

The S.O.L.I.D. Principles

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There have been many questions I encountered lately of what are the best practices / guidances that you can take up on when designing an application.

Wheather that’s an ASP.NET application or any other type of application that uses object oriented principles.

First and upmost, let me begin with probably one of the most important principles in object-oriented development and design, and that is the Separation of Concerns(SoC) principle.

Separation of Concerns (SoC)

SoC is the process of dissecting a piece of software into distinct features that
encapsulate unique behavior and data that can be used by other classes. Generally, a concern represents a feature or behavior of a class. The act of separating a program into discrete responsibilities significantly increases code reuse, maintenance, and testability. Like, for example MVC can separate content from presentation and data-processing (model) from content.

Of course, every programming language has it’s own ways to incorporate this principle in it’s own ways.

The S.O.L.I.D. Design Principles

S.O.L.I.D. (stands for Single responsibility, Open-closed, Liskov substitution, Interface segregation
and Dependency inversion).

The S.O.L.I.D. design principles are a collection of best practices for object-oriented design. All of the generally known Gang of Four design patterns adhere to these principles in one form or another. The term S.O.L.I.D. comes from the initial letter of each of the five principles that were first collected in the book Agile Principles, Patterns, and Practices in C# by Robert C. Martin. Commonly known to us as “Uncle Bob”

The following sections describes each one of them.

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The S.O.L.I.D. Principles