A design pattern is a general reusable solution to a commonly occurring problem in software design.

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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 ...
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2answers
642 views

How should I handle logger failures?

In several of our company's applications, we use a custom logger. It's fairly robust, though we may replace it with something like NLog in the future. One of the logger's tasks is to log any ...
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0answers
175 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 ...
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1answer
142 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 ...
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5answers
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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 ...
2
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3answers
545 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 ...
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1answer
140 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, ...
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2answers
182 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 ...
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2answers
83 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 ...
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4answers
641 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 ...
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0answers
136 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 ...
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2answers
97 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 ...
16
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5answers
3k views

Why is MVC more popular than PAC? [closed]

I just stumbled upon a question at SO about PAC and got interested in the pattern. I'm wondering why it's not as widely used as MVC? What is the MVC benefits compared to PAC?
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4answers
289 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% ...
3
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1answer
143 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 ...
8
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2answers
1k 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 ...
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3answers
177 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 ...
4
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2answers
609 views

In MVP, should presenters instantiate and control other presenters?

I've implemented an application using MVP with GWT, which is working out very nicely for views that have a single purpose. Now, it has evolved into views that are achieving multiple purposes in a ...
2
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3answers
276 views

API - How to handle scope based functionality?

TLDR; Where and possibly how should I implement scope based logic in the example code? I have got a ASP.NET Web Api. The Api uses OData (on top off REST) for data endpoints and OAuth 2.0 ...
3
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1answer
248 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 ...
6
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2answers
228 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
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1answer
94 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 ...
1
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1answer
115 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 ...
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1answer
53 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: ...
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1answer
349 views

Creating a online database creator

I've been thinking of creating an online database creator (think DabbleDB, Zoho Creator, Intuit Quickbase, etc.). I've been thinking of a couple solutions: Have 4 database tables: Tables, Rows, ...
37
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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
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0answers
59 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 ...
2
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1answer
224 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 ...
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2answers
139 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
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1answer
210 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 ...
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12answers
5k views

What design patterns are the worst or most narrowly defined? [closed]

For every programming project, managers with past programming experience try to shine when they recommend some design patterns for your project. I like design patterns when they make sense or if you ...
0
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1answer
181 views

Is this a good service locator, and is this service locator pattern(?) OK?

I'm working in Zend framework 1 and was using Zend_Registry to store objects so that I could replace them in my controllers while unit testing: $auth = Zend_Registry::get('Auth'); // set in ...
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2answers
89 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()); ...
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1answer
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Pattern for separating UI code from logic in Wicket

I'm using Apache Wicket for developing web apps, I have developed a few for the last year and it has been great; today I was looking at a few pages and most of them look like this: public class ...
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1answer
176 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 { ...
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2answers
121 views

Design pattern for canceling a long task in a sub-thread

Suppose we have a file copy program. It has two threads, a UI thread displaying the progress of the copy operation and a work thread copying the file. The UI has a button for canceling the process. ...
0
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1answer
154 views

Better pattern than large if/else if/else for checking conditionals [duplicate]

I've got a fairly large set of booleans I'm checking in javascript, and then using them to alter the state of a layout in my React app. The whole thing is unwieldy, difficult to read, inelegant, and ...
16
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1answer
745 views

When to use prototypical programming in JavaScript

I've spent a good bit of time developing simple widgets for projects in the following way: var project = project || {}; (function() { project.elements = { prop1: val1, prop2: val2 } ...
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0answers
32 views

Strategies for maintaining backwards compatibility when persisting objects to XML [duplicate]

I am using XStream to persist Java objects to files. This works fine and so far I have had no problems. However, in the course of development, the objects have changed. Some new properties have been ...
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0answers
142 views

Choosing the right design pattern/architecture for a scenario

I have a situation, in which I would like your opinion about the best approach that I should take. Let's consider 10 classes (obj001, obj002 etc.) all which represent some business entities, and are ...
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1answer
129 views

Software to access GSM Terminal, sending and receiving AT commands, validating results

I am currently implementing a software that uses a GSM terminal to perform actions. Actions can be sending messages, checking balance, receiving status report messages, setting the pin, ... The ...
0
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1answer
135 views

Why use the Singleton pattern over class functions and fields? [duplicate]

I'm going to start by saying that I understand that programming in mostly class functions and variables can be harmful to object-orientation, and that most of the time an instance is preferred. I'll ...
2
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0answers
70 views

Injecting data processing logic into class

I want find more elegant and appreciate way to inject processors into CommandProcessorDispatcher class. Or it can be another one solution (the goal is separate each command processing logic to ...
1
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4answers
202 views

What is the efficient way to eliminate duplication? Design patterns?

I have a helper class which has a method that perform some checks against a field in a model. I have two models, ModelA and ModelB, they have some similarities but not all. One of them is they both ...
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8answers
7k views

Are utility classes with nothing but static members an anti-pattern in C++?

The question Where should I put functions that are not related to a class has sparked some debate over whether it makes sense in C++ to combine utility functions in a class or just have them exist as ...
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2answers
462 views

Which design (pattern) would be suitable to abstract logging platforms?

I need to create a simple system to abstract logging platforms. The idea is that I'd like to be able to exchange or activate a logging platform (nlog, log4net, enterprise library) via some ...
1
vote
3answers
325 views

Best OOP pattern to use for creating a commandline SQL API for a proprietary json based company datastore

We need to create a SQL commandline tool for querying a proprietary json based datastore. I'll be using java. Any suggestions on the primary OOP design pattern I should use for building this API? ...
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1answer
219 views

Should I use Strategy Pattern for this task?

I'm setting up a data validator that will iterate through the rows of a spreadsheet, and for each column, perform a validation check. I was thinking that this might be an appropriate task for the ...
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3answers
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What is a good design pattern for generating an Excel (xlsx) file in code?

See my Update at the bottom for more. I occasionally have projects where I have to output some data as an Excel file (xlsx format). The process is usually: User clicks some buttons in my ...
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4answers
561 views

Why use Creational patterns in Java?

How are Creational patterns useful? Most of the material I came across explains the use case to "solve common problems associated with object creation, improve flexibility". I can think of just two ...