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

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How/should I introduce a new pattern into my codebase [closed]

I have recently discovered the Builder pattern and the Step Builder pattern which are essentially just like object initialisers but with the Step Builder pattern you can add mandatory fields. We have ...
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3answers
158 views

Handling if-statements with a known duration [duplicate]

I wasn't sure exactly what to call these situations, so I'll illustrate it. If I have something like this in a method: if (i <= 5) doSomething(); else doSomethingElse(); but I know ...
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115 views

C++ design for encoder/decoder classes with different stored types

I need to handle different elements in a vector, each element owning a specific parameter (integer or string), so that I can easily handle encoding/decoding of a series of elements. Encoding a list ...
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2answers
112 views

MVC is a kind of Design Pattern? [duplicate]

While I was trying to concrete the concept of design pattern, I came up with a question: As I asked in the title, Is MVC(Model-View-Controller) architecture kind of Design Pattern?
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65 views

How to better isolate JOGL or LWJGL3 dependency from game clients?

I'm currently working on a project to develop a relatively small framework with the goal of supporting game development efforts for students in a course. The scope of this project is an OpenGL-based ...
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3answers
184 views

Design pattern for different code behaviors according to different clients

At my company, we have a solution composed of a WinForm (multiple per client) and an API (one per client). This solution is deployed on different clients that require the solution to behave ...
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3answers
708 views

Unknown design pattern

I am currently trying to refactor some code and one of the problems I came across was the constructors had far too many parameters (15 in fact) and was being initialised by another object which had ...
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1answer
69 views

Should the server and client portions of an SPA be separate repos? [closed]

I'm building an SPA (my first), and I had a question about organization. (I'm using Node.js for the server and Browserify & React for the client, and that's mildly important later). I'm unsure if ...
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117 views

is this a valid javascript design pattern when many instances are required?

I have some code that I'm refactoring, right now its just a list of functions, primarily jQuery. The code is a form builder. The user adds sections, questions etc using jqueryUI drag/drop/sort. They ...
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2answers
141 views

Handling insertion to database with Repository pattern

I have a design question for working with databases in object-oriented PHP. I have a table in my database called products. Then I have 2 classes for this table in my PHP project. ...
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4answers
200 views

Using variable + method invocation or repeating invocation?

Here is two methods that does the same thing. One is repeating the call to the method Print where the other one does not but has an additional variable. class Program { static void Main(string[] ...
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1answer
112 views

What is the name of the pattern for passing an incomplete object to a constructor? [closed]

Several times in javascript I've seen a constructor function take in one parameter. The constructor will initialize all the fields for the object to default values and then use the parameter to ...
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6answers
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How to reduce a switch in a switch statement?

So I'm making a method to create a salutation line based on two people from a database. There are four parameters: the two names (name1 and name2) and the two genders (gender and gender2). For every ...
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1answer
70 views

What's the difference between a Factory method and Entity Translator

The entity translator provides a function that takes one or more data contract classes as parameters and returns a specific business entity. Within the implementation of the function, a new ...
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2answers
180 views

Is there a name for this data structure pattern consisting of a list of dictionaries each with one entry, consisting of an object? [closed]

There is a data structure idiom that looks something like this: [ { obj_1_id: { key1: value1_1, key2: value2_1 } }, { obj_2_id: { key1: ...
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2answers
108 views

Issues deciding on approach to create object

I'm trying to decide what's the best approach to instantiate a particular class. Basically there are two use cases for it: instantiate it in order to save a new entry to the database and fetch an ...
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2answers
252 views

Is there a name for this pattern?

A while loop can be written as follows in C# (and many other languages): int someValue; int someTerminatingValue; while ((someValue = GetSomeValue()) != someTerminatingValue) { // Do something ...
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0answers
32 views

What's the difference between Transaction Script and Service Objects?

Recently I saw so many people talk about Transaction Script and Service Objects. For example, the Transaction Script in this article: The glory of Transaction Script is its simplicity. Organizing ...
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2answers
119 views

The correct way of declaring & instantiating variables ( Javascript ) [duplicate]

I have seen other peoples code and each person has a different way of declaring variables. And I have been told by quite a few people that declaring variables in the Global Scope is wrong. My ...
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2answers
386 views

How to use SOLID principles in this example

I have reading about SOLID principles last week and decided to try to solve real world problem by using them. So I got the problem of real world ecommerce site managing totals. Problem Statement: ...
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1answer
117 views

Pattern for communicating between nested usercontrols and parent form (C# / Winforms)

I'm trying to decide the best way to handle communication between a UserControl that is nested within another UserControl and the parent Form itself. I have a Form, inside the form there's a ...
3
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1answer
70 views

How should I handle incompatible configurations with the Bulider pattern?

This is motivated by this answer to a separate question. The builder pattern is used to simplify complex initialization, especially with optional initialization parameters). But I don't know how to ...
4
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1answer
241 views

When to use Prototypes & the correct usage of Prototypes ( Javascript )

I have been programming in Javascript for a while and I am quite comfortable with it. And I know the basic concept of prototypes and I have also used them a few times. But one thing I can't figure out ...
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91 views

Building a class that contains built classes

I have some classes I've created that are immutable and follow the builder pattern. I'm now creating a composite class that will include those classes as fields. Should the builder for that composite ...
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1answer
101 views

How to implement role permissions in service layer?

In my current project i have Report class and i am going to implement service layer for it. Every method will be allowed only for some roles. Like this. public class ReportService : IReportService { ...
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55 views

Haskell + OpenGL framework

I'm writing a framework in Haskell where I'd like to use OpenGL to draw lines, shapes... I'm encountering a problem defining the structure of my program. I have for example a Polyline type which holds ...
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1answer
114 views

How to access a variable that I only need to create once on Application.Start

According to this guide: https://github.com/mspnp/azure-guidance/blob/master/Retry-Service-Specific.md They say: Note that the StackExchange.Redis client uses multiplexing through a single ...
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5answers
267 views

OODesign: Data Structure which calls algorithm on insert

I have a data structure which has an add function. When the user instantiates a new data structure object, she can specify an algorithm which will be executed each time the add function is called and ...
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3answers
150 views

What is a good Design Pattern for a bundle of methods that comprises an algorithm?

This is a Design question relating to finding out a good OO design pattern or design structure or class combination that can house an algorithm that processes user selection to produce product ...
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Accessing data in widget

Background I started to get involved in a project written in python and wxPython (for the GUI). My task is to debug and add a few features to the GUI. The widgets are organised mainly with sizers, ...
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1answer
261 views

What design patterns could be used here?

I'm trying to come up with a nice design (preferably pythonic) for the following use case. Say there's three services - A, B, C in multiple locations L1, L2, L3, etc. Each service provides ...
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1answer
150 views

How to prevent multiple form submissions when user reloads the page

I'm currently working on a project which requires that we integration a 3rd party SOAP API to handle a number of basic CRUD type operations. Our current implementation allows us to leveraging the ...
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2answers
148 views

Advantages of these recommendations in ooprogramming using Java

Below are the recommendation from section 5.1 of this essay. While Java is not a pure object-oriented language, it is possible to program in a pure object-oriented style by obeying the following ...
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1answer
94 views

DTOs vs Domain Models and invoking Command Handlers directly

I was just hoping someone might be able to answer a few questions I have regarding the proper design of DTOs and Domain Models. I'm currently working on a project which involves leveraging a SOAP API. ...
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1answer
53 views

Is this a Model or a ViewModel?

In a login screen, a user may expose his username and password data. The same way, in a user list screen, it may expose user name, age, and phone. But none of this views may expose any other user ...
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2answers
117 views

Joshua Bloch Enum Singleton and Third Party APIs

In the book Effective Java he give the best Singleton pattern implementation in his, that is implement by a Enum. I have doubt to how to implement this pattern with a third party API. I'm using an ...
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1answer
66 views

How to use DataMapper pattern methods, when loading data from database?

How do I use DataMapper Pattern? I can use it as a glorified Database Access Object, aka TableGateway (loading a single class from a single database table), or I can use it more to drive business ...
3
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1answer
127 views

Creating an interface just to decouple from third party libraries

I'm currently developing the Authorization module on a framework of mine. I have the following class so far: public interface IAuthorizationManager<C> where C : ...
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1answer
104 views

How to authenticate against an API?

In a enterprise distributed system, a user of a web portal can sign into one site, be redirected to a federation provider. Once they log in with, for example, a facebook account, that user is ...
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1answer
108 views

Python Classes and Design Questions

What is the best way to design a class to see if an update occurs on a property? I have a whole bunch of classes, and current am going through a re-design of the python package I created. ...
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215 views

Is this too much work for a Gateway to do?

I'm writing a Gateway class that wraps access to a web service which provides information about a player's item inventory in a video game. This web service returns a variety of information, however I ...
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1answer
185 views

Single source of truth within an enterprise distributed system

Within an enterprise distributed system I have many services - an ecommerce service, a CRM, support desk, finance, billing. Many of these services share common data, such as Customer data. These ...
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2answers
139 views

Does it break SRP to have concerns of data handling and object mapping inside a single class, as part of the DataMapper pattern?

Summary I want to look into separating the concern of "creating a populated object from database", to use inside my application. DataMapper pattern seems to be doing just that for me. DataMapper ...
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3answers
120 views

What design pattern is this? [duplicate]

I'm struggling to come up with the name of a design pattern that I need to write about. I've been lead to think it was abstraction but apparently not. Let's say I had a driver class which has a Drive ...
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4answers
379 views

Reducing boilerplate in class that implements interfaces through composition

I have a class: A that is a composite of a number of smaller classes, B, Cand D. B, C, and D implement interfaces IB, IC, and ID respectively. Since A supports all the functionality of B, C and D, A ...
3
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1answer
155 views

Design: .NET web app architecture problem

I'm taking my first foray into .NET and I'm designing a web app that's heavy on other web services right now. I'm intending to do the following: Take user input (a USDOT number) Request data from a ...
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1answer
134 views

How to avoid tying these two methods together with global mutable state?

I'm in the process of reading Code Complete 2 and learned that using global state is a no-no. What can I do to avoid using global state in this situation? Some background information: I have two ...
1
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1answer
131 views

Design Pattern - Adding features to a class

I'm finding myself unable to solve a design problem. For the sake of my simplicity, I'm going to use C# (Web API). Let's say I have an abstract class RestController: public abstract class ...
1
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1answer
104 views

Pattern to share fields in inheritance

I'm trying to figure out the best way to solve a design issue. I have to be able to clone (I'm cloning them to Apache HttpClient) different types of HttpServletRequest (POST, GET...) and then send ...
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2answers
96 views

Android: Pattern for checking requirements at startup?

My app's launcher activity checks a bunch of requirements like whether GPS is enabled, there's a network connection, the app has device administrator privileges, etc. Some of these checks display ...