How do you determine how coarse or fine-grained a 'responsibility' should be when using the single r

Posted by Mark Rogers on Stack Overflow See other posts from Stack Overflow or by Mark Rogers
Published on 2010-03-16T15:31:56Z Indexed on 2010/03/16 16:51 UTC
Read the original article Hit count: 202

Filed under:

srp

|

design

|

best-practices

|

solid

|

oop

In the SRP, a 'responsibility' is usually described as 'a reason to change', so that each class (or object?) should have only one reason someone should have to go in there and change it.

But if you take this to the extreme fine-grain you could say that an object adding two numbers together is a responsibility and a possible reason to change. Therefore the object should contain no other logic, because it would produce another reason for change.

I'm curious if there is anyone out there that has any strategies for 'scoping', the single-responsibility principle that's slightly less objective?

© Stack Overflow or respective owner

Related posts about srp

Aren't Information Expert / Tell Don't Ask at odds with Single Responsibility Principle?

as seen on Stack Overflow - Search for 'Stack Overflow'
It is probably just me, which is why I'm asking the question. Information Expert, Tell Don't Ask, and SRP are often mentioned together as best practices. But I think they are at odds. Here is what I'm talking about: Code that favors SRP but violates Tell Don't Ask, Info Expert: Customer bob = .… >>> More
How do I prove or disprove "god" objects are wrong?

as seen on Programmers - Search for 'Programmers'
Problem Summary: Long story short, I inherited a code base and an development team I am not allowed to replace and the use of God Objects is a big issue. Going forward, I want to have us re-factor things but I am getting push-back from the teams who want to do everything with God Objects "because… >>> More
IValidatableObject vs Single Responsibility

as seen on Programmers - Search for 'Programmers'
I like the extnesibility point of MVC, allowing view models to implement IValidatableObject, and add custom validation. I try to keep my Controllers lean, having this code be the only validation logic: if (!ModelState.IsValid) return View(loginViewModel); For example a login view model implements… >>> More
Design patterns to avoiding breaking the SRP while performing heavy data logging

as seen on Programmers - Search for 'Programmers'
A class that performs both computations and data logging seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design patterns or architectural patterns can be used to avoid bloating all the classes with logging calls every… >>> More
Composite-like pattern and SRP violation

as seen on Programmers - Search for 'Programmers'
Recently I've noticed myself implementing pattern similar to the one described below. Starting with interface: public interface IUserProvider { User GetUser(UserData data); } GetUser method's pure job is to somehow return user (that would be an operation speaking in composite terms). There… >>> More

Related posts about design

What is difference between Interaction design, Visual Design, Web design, UX design, UI design, UI d

as seen on Stack Overflow - Search for 'Stack Overflow'
What is difference between Interaction design, Visual Design, Web design, UX design, UI design, UI development? BTB, link found below answered for UI Vs UX. http://stackoverflow.com/questions/1334496/difference-between-ui-and-ux >>> More
The Incremental Architect’s Napkin - #5 - Design functions for extensibility and readability

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Originally posted on: http://geekswithblogs.net/theArchitectsNapkin/archive/2014/08/24/the-incremental-architectrsquos-napkin---5---design-functions-for.aspx The functionality of programs is entered via Entry Points. So what we´re talking about when designing software is a bunch of functions handling… >>> More
Logo Design Online: Process Of Hiring And Working With An Online Logo Design Company

as seen on Article City - Search for 'Article City'
Hiring an online logo design company is not easy these days; you will find hundreds of logo design companies on just click of a mouse. But it';s up to your decision making skills how you select a best... [Author: Gisselle Gloria - Web Design and Development - October 05, 2009] >>> More
OO Design - polymorphism - how to design for handing streams of different file types

as seen on Stack Overflow - Search for 'Stack Overflow'
I've little experience with advanced OO practices, and I want to design this properly as an exercise. I'm thinking of implementing the following, and I'm asking if I'm going about this the right way. I have a class PImage that holds the raw data and some information I need for an image file. Its… >>> More
Is there any guidelines to convert Table design to Div design keeping same cross browser compatible

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there any guidelines to convert Table design to Div design keeping same cross browser compatible layout? >>> More