Questions tagged [cohesion]
The cohesion tag has no usage guidance.
26
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When refactoring many functions that share state in to a single class, how can you avoid writing an "escort" class?
This well-known article criticises Java on the basis that it does not allow you to write functions that do not live in a class. This flaw forces you to write classes with names that look suspiciously ...
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2
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Performance hit after non-functional refactoring
I was asked to refactor some C++ code recently for the purposes of increasing unit testing coverage. The problem was that the code was tightly coupled on one compilation unit, so we had the equivalent ...
- 223
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2
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127
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How to maintain cohesion, loose coupling, and SRP when building a reporting tool?
I'm building a reporting tool with three core layers:
Extract data from a database
Transform this data to compute business metrics
Display these metrics in a report (a heavily formatted Excel export ...
- 119
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0
answers
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Cohesion and coupling possible combination in software
I know what we mean by cohesion and coupling in software. And generally the best practice is to achieve high cohesion with low coupling.
It seems to me though that they are inter-related. I.e. you ...
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223
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Avoiding coupling through code sharing
I have been working on an application which consists of several cohesive services, Customer, Invoice, PurchaseOrder, Highlight, the application is deployed within a mono repo and each service is ...
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2
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About coupling and cohesion
At the end of this discussion about coupling and cohesion https://www.youtube.com/watch?v=hd0v72pD1MI some renowned programmers agreed in the general thought that to achieve high cohesion you have to ...
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votes
1
answer
138
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Achieving loose coupling
My scenario involves the following classes:
I have three types of Peer that creates a RegistryType instance because its methods are needed. Same for Identity class. Each PeerType need 0 or all the ...
- 131
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1
answer
209
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New frontend for legacy code
How would you engineer this:
You have a legacy application that is a big ball of mud and a monolith. This application is "impossible" to change to look good on mobile devices.
The management ...
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2
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Use old legacy application code from new application
If you have a big legacy application (big ball of mud), lets call it MudApp.
If you then create a new application to make us of new technology and to make a new good looking frontend because that was ...
- 59
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4
answers
344
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Is there multiple definitions for responsibility of class?
In the book UML 2 and the Unified Process from Arlow and Neustadt has been told:
Analysis classes should have 3 to 5 responsibilities
But as you know we have the SRP that tells us something else!!
...
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1
answer
969
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What is informational cohesion?
I try to understand what cohesion means when designing modules. Myers states in his book "Composite structured design":
An informational-strength module has the following definition:
It ...
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answer
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Concept of functional cohesion
I made some research to better understand the concept of functional cohesion. Myers in his book "Composite structured design" has written about functional cohesion:
A functional-strength module is ...
- 119
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1
answer
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Directed Graphs
Conisder the following piece of code :
cin >> a >> b;
int x,y,z;
x=0; y=1; z=1;
if (a > b){
x = a*b;
while (10 > a){
y=y+z;
a=a+5;
}
else {
x=x+b;
}
Its Directed graph is shown ...
- 493
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0
answers
167
views
Packages, a controller class, and coupling vs cohesion
So I'm building my first application, in Python, and some issues have cropped up because of the lack of interfaces (I.e. explicit type declaration)
My design involves several homebrew packages, and I'...
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votes
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answer
864
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Tight class cohesion metric, all or just public methods?
I am researching cohesion topic and found out that some claim TCC metric should only include public methods, some other sources claim all methods. Would it be wrong to use either approach? Why private ...
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vote
1
answer
86
views
How to implement a large algorithm with mostly unrelated steps while maintaining cohesion
I want to implement something similar to the algorithm described here. I don't even know if "algorithm" is the right word, since many of the steps are considered to be algorithms themselves. What I've ...
1
vote
1
answer
117
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Packages : opposing forces of reusability and developability
In choosing the classes to group together into packages, we must consider the opposing forces involved in reusability and
developability. Balancing these forces with the needs of the
application ...
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6
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506
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Object Design & Cohesion - Issue & potential refactoring
Abstract
I have been trying to get my head around the cohesiveness of some functionality in our code base. I’ve approached this design in different ways, and lately I’m convinced that I took the ...
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1
answer
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What is the evidence that an API has exceeded its orthogonality in the context of types?
Wikipedia defines software orthogonality as:
orthogonality in a programming language means that a relatively small set of primitive constructs can be combined in a relatively small number of ways ...
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6
answers
4k
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Fields vs method arguments [closed]
I just started writing some new class and it occurred to me that I was adding a lot of method arguments that are not strictly needed. This is following a habit to avoid having state in classes that is ...
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Does increasing the number of classes increase code complexity? [duplicate]
To illustrate the question, let's say we have two programmers of comparable skill that both solve the same problem. The code they turn out has roughly the same lines of code, but one programmer uses 5 ...
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3
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Programming by Intention, Depth-First or Breadth-First?
Say I have the following graph of dependencies between procedures/functions/methods:
o
/ \
v e
/ \ / \
r f l w
That is, function o first calls function v, and then ...
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4
votes
7
answers
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What's the opposite of cohesive?
I was talking with my architect about some concerns with a particular approach that may result in very low level of cohesion in a set of classes. However, I couldn't think of the word that represents ...
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What is logical cohesion, and why is it bad or undesirable?
From the c2wiki page on coupling & cohesion:
Cohesion (interdependency within module) strength/level names : (from
worse to better, high cohesion is good)
Coincidental Cohesion : (...
user39685
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3
answers
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Low Coupling: Single Responsibility Principle vs Cohesion
I've read several articles on SRP and cohesion, and they seem to contradict each other as far as low coupling is concerned.
Articles on cohesion argue that putting closely related responsibilities ...
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answers
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How to determine if a class meets the single responsibility principle?
The Single Responsibility Principle is based on the high cohesion principle. The difference between the two is that a highly cohesive classes features a set of responsibilities that are strongly ...
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