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Chad Myers' Blog » Pablo's Topic of the Month - March: SOLID Principles

Pablo's Topic of the Month - March: SOLID Principles


Pablo's Topic of the Month - March: SOLID Principlespablos_topic

Over the next few days and weeks, the Los Techies crew will be writing a number of blog posts focused a particular subject in addition to their regular blogging.  Pablo's Topic of the Month for the month of March is Bob Martin's S.O.L.I.D. design principles. We'll try to cover all of them by the end of the month or we might focus in on a few of them and go really deep.  Please stay tuned and please give us some feedback of how you like this format because we're considering doing it in upcoming months.

If you haven't already, please consider subscribing to the Los Techies Main Feed so that you can see the various post from the other Los Techies bloggers.

The main feed is here:  http://feeds.feedburner.com/lostechies 

What is S.O.L.I.D.?

S.O.L.I.D. is a collection of best-practice object-oriented design principles that you can apply to your design to accomplish various desirable goals like loose-coupling, higher maintainability, intuitive location of interesting code, etc.  S.O.L.I.D. is an acronym for the following principles (which are, themselves acronyms -- confused yet?).

These principles were pioneered and first collected into a written work by Robert 'Uncle Bob' Martin. You can find more details here: http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod

I'm going to give you a teaser here of each one, but I won't go into much detail here as that's what the other Los Techies articles are going to be about.  Please check back to this post as I'll be updating it with links to other posts as they appear so you can keep tabs on what's going on. 

The attribution of the following snippets goes to Robert Martin from various publications.

SRP: Single Responsibility Principle

THERE SHOULD NEVER BE MORE THAN ONE REASON FOR A CLASS TO CHANGE.

OCP: Open Closed Principle

SOFTWARE ENTITIES (CLASSES, MODULES, FUNCTIONS, ETC.) SHOULD BE OPEN FOR EXTENSION BUT CLOSED FOR MODIFICATION.

LSP: Liskov Substitution Principle

FUNCTIONS THAT USE ... REFERENCES TO BASE CLASSES MUST BE ABLE TO USE OBJECTS OF DERIVED CLASSES  WITHOUT KNOWING IT.

ISP: Interface Segregation Principle

CLIENTS SHOULD NOT BE FORCED TO DEPEND UPON INTERFACES THAT THEY DO NOT USE

DIP: Dependency Inversion Principle

A. HIGH LEVEL MODULES SHOULD NOT DEPEND UPON LOW LEVEL MODULES. BOTH SHOULD DEPEND UPON ABSTRACTIONS

B. ABSTRACTIONS SHOULD NOT DEPEND UPON DETAILS. DETAILS SHOULD DEPEND UPON ABSTRACTIONS

Kick It on DotNetKicks.com
Posted Mar 07 2008, 09:01 PM by chadmyers

Comments

Joe wrote re: Pablo's Topic of the Month - March: SOLID Principles
on 03-07-2008 10:31 PM

Look, I'm a big Bob Martin fan (reading Agile etc etc c# again right now), but who do we petition for the (Iranian-style) death penalty for anyone introducing another freakin' acronym?  And an acronym of acronyms at that...

Most of us (I hope) want the 501 developers we work with to adopt the principles we talk about, not roll their eyes and shove us out the door while deciding "f**k you, I'm dragging a datasource control and a datagrid onto this webform, you awful nonsensical ***che/gas-bag".

Standing athwart the agile blogosphere yelling Stop,

Joe

DotNetKicks.com wrote S.O.L.I.D. principles
on 03-09-2008 3:25 PM

You've been kicked (a good thing) - Trackback from DotNetKicks.com

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on 03-10-2008 3:21 AM

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on 03-10-2008 7:01 AM

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on 03-11-2008 8:14 AM

This is the email I sent to the dev team in SilverKey Tech. Egypt dev team yesterday, sharing here as

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on 03-14-2008 11:04 PM

In following suite with the The Los Techies Pablo's Topic of the Month - March: SOLID Principles

http://www.lostechies.com/blogs/chad_myers/archive/2008/03/07/pablo-s-topic-of-the-month-march-solid-principles.aspx wrote http://www.lostechies.com/blogs/chad_myers/archive/2008/03/07/pablo-s-topic-of-the-month-march-solid-principles.aspx
on 03-16-2008 3:27 PM
J.D. Meridth wrote PTOM: Single Responsibility Principle
on 03-28-2008 9:15 PM

The Single Responsibility Principle This post is about the first letter in Uncle Bob's SOLID acronym

J.D. Meridth wrote PTOM: Single Responsibility Principle
on 03-29-2008 8:22 PM

The Single Responsibility Principle This post is about the first letter in Uncle Bob's SOLID acronym

Christopher Bennage wrote The Roots of Best Practices
on 03-30-2008 12:56 PM

I've been asked about best practices and good design several times over the last few months. A few

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on 03-30-2008 1:26 PM

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Jimmy Bogard wrote NotImplementedException and the Interface Segregation Principle
on 10-12-2008 2:50 PM

This week, Derrick Bailey will be in town (Austin) to talk about the SOLID principles .  One of

new ThoughtStream("Derick Bailey"); wrote Thanks ADNUG attendees! Slides and code available.
on 10-14-2008 9:56 AM

I had a lot of fun giving my SOLID Principles presentation at the Austin .NET User Group last night.

Chad Myers' Blog wrote 1 Year Anniversary
on 11-21-2008 11:05 AM

I’m generally not one for sentimentality, so it should come as no surprise to anyone that knows me that

Raji Abraham wrote re: Pablo's Topic of the Month - March: SOLID Principles
on 11-24-2008 4:52 PM

I read these principles and more in the book by Bertrand Meyer (Object Oriented Software Construction - Prentice Hall International) more than a decade ago; though not per this acronym

Faculty of The Mind wrote Unit Testing Gives Merit to Design Patterns
on 12-08-2008 4:58 PM

Unit Testing Gives Merit to Design Patterns

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on 12-10-2008 3:30 PM

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on 01-05-2009 2:24 PM

S.O.L.I.D. principles seem to be a hot topic.  The guys over at LosTechies.com explored it last

Community Blogs wrote Real Life Single Responsibility Principle
on 01-05-2009 2:53 PM

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on 01-06-2009 12:52 PM

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Pro Information Center » Blog Archive » Thinking only of the Junior Developer wrote Pro Information Center » Blog Archive » Thinking only of the Junior Developer
on 01-26-2009 10:14 PM

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Blog | Rubyyot » Blog Archive » Plans for Rubyyot.com and the Summer of Learning Challenge wrote Blog | Rubyyot » Blog Archive » Plans for Rubyyot.com and the Summer of Learning Challenge
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???????????? ?????????????????????????? ???? ???????????? ???????????????????? ?????????????? (DDD: Domain Driven Design) « butaji wrote ???????????? ?????????????????????????? ???? ???????????? ???????????????????? ?????????????? (DDD: Domain Driven Design) « butaji
on 06-06-2009 2:48 PM

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Vitaly Baum wrote Учимся проектировать на основе предметной области (DDD: Domain Driven Design)
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same ol interviews will get you the same ol employees « while(career==rut) musings++ wrote same ol interviews will get you the same ol employees « while(career==rut) musings++
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C# SIG Meeting – 07/21/2009 – Recap « Rhonda Tipton’s WebLog wrote C# SIG Meeting – 07/21/2009 – Recap « Rhonda Tipton’s WebLog
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' + title + ' - ' + basename(imgurl) + '(' + w + 'x' + h +') wrote ' + title + ' - ' + basename(imgurl) + '(' + w + 'x' + h +')
on 07-31-2009 10:40 AM

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on 08-14-2009 7:47 AM

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Richard Dingwall » SOLID ugly code wrote Richard Dingwall » SOLID ugly code
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Polyglots R Us wrote Take 2: Why we use SOLID in static languages and how we get the same functionality for cheap in dynamic languages
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One of the things we do pretty well at Los Techies is explaining SOLID principles and why they make our

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on 01-07-2010 2:10 PM

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