Tagged Questions
A design pattern is a general reusable solution to a commonly occurring problem in software design.
1
vote
0answers
14 views
Sharing state with dependencies - Object-Oriented Design
Suppose that I define two interfaces below:
public interface IReader
{
void Read(string bookName);
}
public interface IWriter
{
void Write(string bookName);
}
Now I want to implement ...
-2
votes
0answers
28 views
(CQRS) with ASP.NET MVC5 [on hold]
I have a project and want to implement that,using ASP.NET MVC5 and N-Layer architectural pattern.I become interest to use Command Query Responsibility Segregation (CQRS) in my project.I am new to CQRS ...
-1
votes
1answer
48 views
How is the UnitOfWork pattern related to Monadic programming?
Looking over the definition of the Unit of Work pattern it seems very much like what a programmer would get if they implemented a Monad such as an IO or Transaction Monad. What makes the unit of work ...
3
votes
1answer
57 views
Do conditional delegation or different member types break the Composite pattern?
Here's how I understand the composite pattern:
In the composite pattern, a root object is composed of objects which may be further composed. Moreover, to be considered composite, all those objects ...
-1
votes
1answer
22 views
Extracting client specific code. refactoring possibilities required
I am facing a Design problem. I have a set of classes which writes data in XML,JSON or HTML formates for different clients.
I have a class which receives Data and a XML, JSON or HTML writer as it ...
0
votes
0answers
10 views
Extracting client specific code. refactoring possibilities required [duplicate]
I am facing a Design problem. I have a set of classes which writes data in XML,JSON or HTML formates for different clients.
I have a class which receives Data and a XML, JSON or HTML writer as it ...
1
vote
1answer
130 views
Is SICP still relevant? [on hold]
Today, I came across this book entitled:The Structure and Interpretation of Computer Programs
I read the Table Of Contents and it really interests, me. It seems to be exactly what I've been looking ...
0
votes
1answer
61 views
Are there any strong reasons to use DI for sub-classes that are known to be tightly coupled to their parent containers?
I have Product classes for Products A through Z. And each Product class has its own set of product-specific subclasses, which I'd say are tightly coupled to them, like so:
//specific product class ...
1
vote
2answers
61 views
Is there a better pattern for a form object populating itself in 3 different ways?
So I'm writing a form object that deals with a specific thing - price - which is going to be included in several different underlying resources. (The Price is a separate model that may or may not need ...
0
votes
1answer
45 views
designing domain model that can handle large number of data filters?
I'm currently working on a project that I came into several years after it was built. The code is mostly procedural with a few objects that act more like buckets of functions than anything else. I ...
10
votes
6answers
3k views
Is logging next to an implementation a SRP violation?
When thinking of agile software development and all the principles (SRP, OCP, ...) I ask myself how to treat logging.
Is logging next to an implementation a SRP violation?
I would say yes because ...
0
votes
0answers
66 views
What is the relationship between “flux” and pure functional reactive programming?
Flux, as far as I understood, is a technique about dealing with the dataflow of an application unidirectionally, keeping state isolated from the rest of the program in read-only, self-contained ...
1
vote
1answer
113 views
Decorater pattern or strategy pattern
I'm constructing a c# serverside application and I'm trying to do this in a way it can easily be maintained aswell as extended if needed.
So what we have is 4 different requests that need to be done ...
5
votes
3answers
374 views
Is Functional Programming a viable alternative to dependency injection patterns?
I have recently been reading a book entitled Functional Programming in C# and it occurs to me that the immutable and stateless nature of functional programming accomplishes similar outcomes to ...
0
votes
1answer
30 views
Client-Server Application Object with child Objects
Actually I'm going to build an Client Server Application, at the Login I recive the User Object from the Server.
An user has a List of tasks, but I don't want to load them at the Login.
So what would ...
2
votes
3answers
327 views
When do programmers use code first approach?
This is just not related to asp.net mvc but rather related all the mvc frameworks that support code first approach. One of the advantages I often see on asp.net mvc and tutorial blogs is that it ...
0
votes
1answer
106 views
Where should the following business logic be written?
I have a C# console application. This application has many different projects/C# class files, each of them dedicated to parsing a certain kind of XML and creating an object, called 'Response'. Now, ...
7
votes
4answers
503 views
Is the Single Responsibility Principle applicable to functions?
According to Robert C. Martin, the SRP states that:
There should never be more than one reason for a class to change.
However, in his book Clean Code, chapter 3: Functions, he shows the ...
0
votes
1answer
128 views
Program to look at the first say 5 characters of a word and return a string if that string is actually the first 5 characters of a word?
For example, say I have a string and it has the letters:
RDNAL
This is not an actual English word or it doesn't start an actual english word, so the program would skip this string and would avoid ...
-2
votes
0answers
28 views
AngularJs with ASP.NET MVC - How to create solution structure [closed]
How and where to place Angular controller files in the ASP.Net MVC solution structure which can be easy to find and maintain?
1
vote
2answers
132 views
Implementing an anti-corruption layer with domain logic
I'm building an application that compiles a single PDF document from multiple source PDF documents as follows: it takes the first page of each source document, stamps certain information on top of ...
0
votes
0answers
35 views
Reusable tree behaviour implementation of getParent() / getChildren() - Good design? [closed]
Yesterday i had a discussion with my colleague about a strategy to deal with tree behaviours.
We have the following situation: We have a model which has a child / parent relation:
interface ...
0
votes
2answers
69 views
Class design and object references
Here is a very basic example of what I am trying to do. In reallity there are more relations but not something extreme or memory heavy.
public class ClassA : ISomething
{
public double property ...
14
votes
5answers
2k views
If Else - Repeated Code Logic
My boss gave me a project with a particular logic. I have to develop a web page which has to lead the navigator through many cases until he/she arrives at the product.
This is the path scheme of the ...
0
votes
1answer
47 views
+50
Definition of the NHibernate Mapping by Code / EF Code First pattern?
Sub-questions:
Does this pattern have a formal definition?
Who invented it?
Is it considered a DSL?
The reason why I am asking is because I would like to better assess its applicability to ...
5
votes
1answer
106 views
Do you still need created_by and updated_by attributes with dedicated auditing?
For as long as I have been writing database-backed websites, I have included created_by, created_at, updated_by, and updated_at in every single table. As you can guess, whenever a record gets created ...
2
votes
2answers
85 views
Delegating work and programming to component interfaces
I have a MessageHandler class which receives and validates messages before determining which components in the architecture they should be delegated to so they can be processed. This involves calling ...
8
votes
2answers
948 views
Is using interfaces for datatypes an anti-pattern?
Suppose I have a various entities in my model (using EF), say User, Product, Invoice and Order.
I am writing a user control that can can print the summaries of entity objects in my application where ...
1
vote
0answers
67 views
Hierarchical ViewModels and tracking IsDirty/PropertyChanged events
I have a set of ViewModels depicted like in the below picture.
And, I have a couple of commands AcceptCommand, CancelCommand in the Top Level View Model that are bound to Apply, Cancel buttons ...
3
votes
1answer
80 views
Nested REST urls and parent id, which is better design?
Okay, we have two resources: Album and Song. Here is API:
GET,POST /albums
GET,POST /albums/:albumId
GET,POST /albums/:albumId/songs
GET,POST /albums/:albumId/songs/:songId
We know that we hate ...
5
votes
2answers
198 views
Why does 'zip' ignore the dangling tail of the collection?
C#, Scala, Haskell, Lisp and Python have the same zip behaviour: if one collection is longer, the tail is silently ignored.
It could be an exception thrown as well, but I didn't heard of any language ...
2
votes
1answer
53 views
Is Current CoffeeScript Module Pattern Valid?
I have a Node.js web application that's written in CoffeeScript, which has a set of "services". These various services are currently exposed as a CoffeeScript class, which does a few things that I ...
3
votes
4answers
283 views
What architecture/design to adopt when consuming a RESTful API? (iOS App)
TL;DR
Part 1)
I want to refactor the biggest part of the app on which I work - and it is pretty much spaghetti. It's a single class that makes the requests to the server, parses the JSON and saves ...
1
vote
1answer
99 views
How to name a function that makes sure an element exists and returns it?
function getOrInsertEmptyElemById(id){
var elem = $(id) || document.body.insert('<div id="'+id+'"></div>');
return elem;
}
I find myself using functions like the above quite ...
0
votes
1answer
50 views
Methods accounting for all input to method
This is more of a conceptual question. Let's say that you had the following enum
public enum FooEnum {
ALPHA,
BETA,
GAMMA,
DELTA;
}
And let's say you have the following method:
...
2
votes
0answers
47 views
What design pattern is used in this delegating scenario?
I am currently having to bend some framework API to fit my usecase.
The framework provides generic interfaces such as
public interface Processor<T> {
T process(T t);
}
with various ...
0
votes
1answer
28 views
Design of actions handlers requiring some order
I have a REST application where 'actions' can be executed to perform anything in the system. For example: user.save, user.get, etc...
I also have pre and post execution 'handlers'. For example a ...
3
votes
0answers
122 views
What kind of programming pattern is appropriate for programming an algorithm with rules and exceptions?
I'm interested in coming up with an algorithm to solve a guessing game. The player is attempting to guess a sequence of 4 unique numbers from 1 to 9. After a guess, they are told how many numbers of ...
-1
votes
3answers
162 views
How to design a solution that needs dynamism using Inheritance [closed]
I have below code/classes/interfaces:
An Interface:
public interface Animal<A extends Animal<A>>{
void fight(A otherAnimal);
}
2.Tiger class which is implementing Animal
...
0
votes
4answers
252 views
2 methods that are 75% the same? [closed]
I have code that violates the DRY principle and I would like to consolidate 2 methods as much as I can, but the problem I am facing is that they have some differences, I would say they are about 75% ...
36
votes
11answers
4k views
Constructor-only subclasses: Is this an anti-pattern?
I was having a discussion with a co-worker, and we ended up having conflicting intuitions about the purpose of subclassing. My intuition is that if a primary function of a subclass is to express a ...
2
votes
1answer
198 views
Reducing the complexity of over-designed code
I have just started working at a company where I have inherited a C# codebase from a previous developer. I know programming well, have an engineering degree + an (unfinished, several year long) PhD ...
1
vote
2answers
126 views
Sharing code logic between controllers, through the Model layer?
As I originally conceived my Model layer, it was only supposed to hold data and no code.
I receive DTOs from web-services, they are mapped into my Model objects. Those model objects usually end up ...
1
vote
1answer
137 views
Problems with OO design for application with pluggable components
I'm trying to refactor an ugly code and make it easly extendable in the future.
The application should be nothing else but a series of components that have input(s) and output(s). The components ...
2
votes
2answers
129 views
Is there a name for a dictionary that returns the key as the value by default? [closed]
A dictionary that returns the key as the value by default can be used in cases where exceptions or translation is needed.
E.g. One could do
i18n = SpecialDict()
if spanish:
i18n["Hello"] = ...
2
votes
1answer
80 views
Scheme/Design Pattern for allowing a certain outside class to set properties
I came up with a solution (in PHP) to a problem and am wondering if it is a named Design Pattern, and if it is good practice.
I have a collection class and an item class. The collection class is the ...
2
votes
1answer
193 views
What is SteppedPattern?
I read this article on Jon Skeet's blog where he delves into the topic of performance on object pooling & thread safety.
In the article he makes a reference to SteppedPattern:
Most of our ...
0
votes
1answer
43 views
What is the better way of getting different outputs for two very simmilar related workflows
I have a very concrete scenario but I think it would be quite frequent.
I'm trying to come up with a solution that it's "better" by better meaning more scalable, reusable and not smelly.
I'm working ...
1
vote
2answers
81 views
Design Pattern for Removing Default Listeners
We have a standard GUI control with a bunch of default listeners like that:
class OurControl extends Control {
OurControl() {
addMouseWheelListener(new DefaultMouseWheelListener());
...
1
vote
1answer
100 views
Consuming a rest API that exposes nested objects
I have a series of nested objects, exposed over a REST API, like so:
class Categories
{
int id;
string name;
List<Subcategories> subcategories;
}
class Subcategories
{
...
