A design pattern is a general reusable solution to a commonly occurring problem in software design.
3
votes
1answer
24 views
ProductManager: a basic CRUD for products with SQLite
I would like to have a review of this basic CRUD application so I can improve and learn from your experience. The code can be found here.
Design pattern/coding principles improvement that could be ...
2
votes
1answer
21 views
A selection pattern for C++11
In simulating physical equations (such as fluid dynamics) it is common to write an application that deals with 1, 2, and 3 dimensions. A common C/Fortran approach is to make all vectors (for example) ...
2
votes
2answers
37 views
C++ Optional Implementation
I haven't done much programming in C++, so I figured I'd try making an Optional class. I'm mainly concerned that I didn't follow good conventions or that I didn't ...
0
votes
1answer
31 views
Java constructor initialization practices [closed]
This code is just a simple idea which takes a query parameter and requests n number of third party services for the given query:
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2
votes
0answers
36 views
Ember.js blog app architecture
I decided to create simple blog app by using Ember.js which should has the following interface
For this purpose I created ...
0
votes
0answers
50 views
Simple Router class
I made a simple routing class that I like to get reviews for, mostly because I do not know how to make it SOLID, since I even made this class separate from the HTTP response, request ... for the sake ...
3
votes
0answers
15 views
Monkey patch data in dictionary
The chart data is stored in a nested dictionary struct @line_charts, and I need to convert the prices to target currency with the function ...
3
votes
0answers
49 views
Event Aggregator Pattern Decoupling
I have an Android application that is using an EventBus architecture with publishing and subscribing events. Usually this is ...
4
votes
2answers
69 views
Printing gitignores
I have written a simple program in Java 7 to write the .gitignore of different file types:
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2
votes
1answer
46 views
Handling screen rotation with volley request
To handle screen rotation when performing a volley request, I've written this code:
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1
vote
1answer
30 views
Input field that dynamically monitors model value
This question is regarding my approach to the following implementation requirement. Can you suggest a better alternative that doesn't suffer from the issues I'll point out in my implementation?
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13
votes
3answers
1k views
RPG Character Builder
This implements a builder pattern for RPG game characters. Is this a valid builder pattern implementation?
There are 3 characters: Paladin, Wizard and Elfo.
There are 3 items: Potion, Sword, Arch.
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-1
votes
1answer
67 views
Validate prices in Python [closed]
I am new to Python and OOP. I developed a program and the following code is part of a larger system. I used the facade design pattern. I'm looking for a review of my code and its design.
The task of ...
3
votes
1answer
128 views
Populate tree from 3 different data sources and show its content
The task is to build a WinForm app which populates a tree from 3 different data sources and shows its content.
1 ComboBox at top - to choose datasource. (File ...
1
vote
1answer
36 views
Interfaces & Factory for generic container supporting PeekMax, PeekMin, Sum, and PeekNextToMax
This is a partial update of this question.
An implementation of these interfaces is in this question.
To summarize, the class is a generic container similar to MaxHeap, but only needs to support the ...
3
votes
1answer
54 views
Unit testing a service to return items from a database
I have been a developer for many years and get core development concepts, as well as unit testing ones such as DI/Ioc, Mocking etc. I also understand the values, importance of unit testing and writing ...
0
votes
2answers
50 views
Observer pattern implementation
I'm reading Head First Design Patterns and I'm currently reading about the observer pattern. Is what I produced correct?
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3
votes
1answer
31 views
Insertion sort in Common Lisp
This is my first bit of significant code in Common Lisp, an implementation of insertion sort. Being new to Lisp in general, I'm wondering if this code follows best Lisp practices in regards to program ...
3
votes
1answer
99 views
Observable template in modern C++
I'm trying to create a modern template class for a generic observable:
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1
vote
2answers
52 views
Replacing an application service class with multiple command handlers
I have a Controller which uses an application service to accomplish its tasks. The service class is starting to grow big and developing multiple dependencies. So I am thinking of replacing the single ...
7
votes
2answers
146 views
Building an IDE, block by — er, mock by mock
The opening sentence of an answer I received in my previous post snowballed, and led to completely ditching the previous approach. Mocking my IDE with a MockFactory ...
6
votes
1answer
56 views
Connect 4 (glorified tic-tac-toe) implementation
I'm posting here my implementation of the game Connect 4. It's obviously a pretty trivial game and code but I'm primarily interested in any advice concerning improvements to the code structure: types, ...
5
votes
1answer
42 views
Type Validation using State Monad
I am attempting to build a compiler for a stack-based (or concatenative) programming language in Haskell. I've done fine getting the lexer and parser up and running, but now that I'm into the meat of ...
7
votes
1answer
57 views
Using delegates to avoid duplicate creation of resources
I'm writing a PCL that uses an HttpClient to go visit a few sites and extract data from them. My initial code looked like this:
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4
votes
4answers
223 views
Engineering a minimalist image interface without templates
I'm practicing different ways of class design, so I'd like feedback on the design characteristics. Of course code practice comments are also welcome.
It was a conscious decision to omit templates. My ...
1
vote
2answers
76 views
Adding action id to a history repository
In my system I have a history repository.
My history class is big and with a lot of information regarding operations.
My ...
4
votes
2answers
67 views
Decorator pattern for an application
I've created a decorator in my Rails application. However, the initializer has 3 params. Is this generally acceptable in decorator or should I refactor this or try a different pattern?
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1
vote
0answers
62 views
Soccer game using libgdx and an Entity System Framework
I'm working in a game as a hobbie. I'm using an Entity/Component/System architecture using Libgdx as Engine and Ashley as Entity Framework.
I have a GamePlayScreen in which I initialize my system, ...
7
votes
6answers
174 views
Super Market Checkout Pricing Strategies
I saw this question and thought it looked like a great opportunity to try my hand at the Strategy Pattern. I've never used it before, but I think I did pretty well. Did I?
The code below can also be ...
5
votes
4answers
520 views
Database adapters
I'm writing adapters for some MS Access database because I really didn't like that automatically generated code that Visual Studio was providing. Right now I just need to get data, not updating ...
1
vote
2answers
47 views
Separate Ajax code in separate modules
This is the first time I am working on OOJS code and I am a beginner in JS. I think I have pretty much messed it up. I am planning to modularize my code, but with the inclusion of ...
1
vote
1answer
64 views
Creating various types of menus using dependency injection
I am here to discuss what are the possible improvement can be made in order to make the following code covering all the principles of programming paradigm ( SOLID , DRY ...etc ). Basically, I am ...
3
votes
1answer
72 views
Communication between View and Controller in MVC implementation
I'm working on a moderately complicated (not super basic, but not a feat of programming strength) project to create a virtual tabletop for a tabletop game I play. I'm trying to conform to good design ...
0
votes
1answer
57 views
Define constants in Util class or not
Which is best?
I have a bunch of components in my projects. It's related to Ashley (a java entity system) to libgdx (a game engine).
this components are like that:
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-1
votes
2answers
43 views
Varying the parent class dynamically in Python
I am trying to dynamically pick a parent class in Python 2.7:
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3
votes
0answers
55 views
Representing trajectory points using inheritance
Problem Background
I need to represent trajectory points and trajectories (encapsulating these points) in the form of a collection of classes. All trajectory points have two essential elements: time ...
11
votes
2answers
389 views
C++ Observer design pattern implementation
I'm using the Observer design pattern in order to manage events in the game I'm currently developing.
I based myself on the implementation demonstrated here but improved it in order to ease its use.
...
4
votes
1answer
63 views
Number Wizard standalone (UI independent) implementation
I was inspired by Number Wizard game question and I decided to write my own version of the game. My goals were to follow the SOLID principles and make the logic UI independent. I'm a bit confused ...
3
votes
1answer
92 views
Linq-to-SQL DAL on a Windows Forms project
I just started out a new job as a C# programmer on .NET 3.5. My manager gives me total independence on how I build my modules, which is generally a good thing, but there are minuses too. Having too ...
1
vote
1answer
43 views
Fruit game using nape physics with refactoring to Builder Pattern
I am doing a game that uses nape physics in ActionScript, but my question isn't about language. It is about the use of patterns.
I had fruits in my game. I did one interface ...
2
votes
1answer
76 views
Is it an anti-pattern to let ViewModel fill itself from a domain object? [closed]
Let's say you have a Employees table mapped to a Employee class. Now you want to code a Edit page for general information. You need a ViewModel with all the properties you need to build the page, so ...
2
votes
2answers
58 views
Generating classes from enum
I have a system that receives messages. Each message has a type defined. These types are declared in an enum:
enum MessageType {
TYPE1, TYPE2, ... , TYPE999
}
...
6
votes
2answers
156 views
Performing multiple validation checks
I have a validation which checks that a string is a valid asset number. There are currently three formats it could be in, like: 001-123456, ...
1
vote
1answer
44 views
Manager for customer billing and subscriptions in Rails
I'm looking to get rid of a couple dependencies that I have a sneaking suspicion are present in the code that I'm writing.
Right now I have a service class that manages my subscriptions for part of ...
1
vote
2answers
100 views
1
vote
1answer
46 views
Organizing museum artwork
I have a small Django project to help organize museum artwork. In my models.py file, my museum object is defined as follows:
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1
vote
1answer
66 views
PHP Memento design pattern implementation
I am a self-taught programmer. I decided to learn design patterns by reading about them, and then coming up with their implementation in PHP. I know that learning would be virtually impossible without ...
6
votes
1answer
188 views
1
vote
0answers
77 views
Replacing IUnitOfWork with a Factory Pattern
As a follow-up to this blog post and this question, I wanted to post my idea of replacing the IUnitOfWork with a factory pattern. It seems to me that in the case of this blog post the IUnitOfWork ...
1
vote
1answer
54 views
Exposing includes to client over webservice for database queries
I am using a CQRS type patter for querying data in my application. I am currently using entity framework to connect to the database.
...
