A design pattern is a general reusable solution to a commonly occurring problem in software design.
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Which pattern to use to avoid code duplication with a value-object transformer
I want to get rid of the following code duplication within the MyFacadeBean. Consider the following situation:
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1answer
30 views
Implementation of bridge design pattern for a web scraping app - follow-up
Earlier today I tried to implement an example of the bridge design pattern, but I ended up misinterpreting it.
I made a lot of changes:
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1answer
38 views
Implementation of Bridge Design Pattern
I made an implementation of the Bridge Pattern to handle ever-changing in crawler APIs that I'm using in my APP.
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1answer
41 views
Class structure to handle API exchange
I'm developing a simple application that crawls web pages to obtain some information. For this I used and tested some libraries, like crawler4j, jsoup, jaunt and htmlunit. I change the crawler APIs ...
3
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1answer
55 views
Wrapping decorator pattern with a builder
I'm working on a booking application and am in the process of porting some legacy code to a more SOLID and testable architecture. Right now I'm working on the process of canceling bookings. Over the ...
3
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0answers
18 views
Grouping functionality in JavaScript using an Object
I am creating a drawing-app. I want to have a toolbar populated with tools. Each tool is defined in a separate js file. Right now i have defined each tool as an object that contains functions and ...
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1answer
81 views
Option<T> functional type implementation and scenarios
Have you ever being implementing Option<T> functional type? It is discussed here. Basically, it is about using ...
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1answer
23 views
Need a better way to create subclass instances from a base class reference
FeatureMap contains features, derived classes have some mandatory features that the map should have, say keys (the mandatory part) are added and all the features are fetched from somewhere. Since ...
3
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2answers
82 views
3-level deep if-else tree for constructing a neural network
The following code fragment constructs different types of neural networks outputs based on the options supplied. Currently, my code just has a huge note that describes what all the options are ...
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1answer
55 views
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1answer
34 views
Dynamic Dispatch replacement for Generic methods
Type erasure is giving me nuts recently. I'm designing a class that performs symbolic differentiation on a math expression represented as a binary expression tree. The question is more on the design ...
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1answer
143 views
Implement mail sending system elegantly
In my project I need to send emails. Emails will have different credentials and senders. I'm thinking about "abstract factory", but will it be good solution?
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80 views
Repository pattern best practices
Which option is better?
In the first case, I use a universal repository that can work with any entities. The methods of this repository have many parameters, such as string queries, table names, ...
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93 views
ASP.NET MVC with automatic testing (follow up)
This is a follow-up of this question regarding MVC application architecture fit for automatic testing.
I have rewritten the DI code based on the answer provided there and also created some tests to ...
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1answer
98 views
Bloch's Builder Pattern / Updater
I'm creating many builders where I use inheritance.
My resources have many properties and are stored in a Repository.
In rare case I need to update them.
When I update, I need to keep the same ...
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2answers
93 views
Array class to replace all iterator needs
Following dreams, I have started learning Java for Game Programing purposes and, during code I figured out that Iterators such as Queue, Lists, Arraylists and what not are very common. I have written ...
6
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1answer
54 views
1 or 2 Player CLI Tic-Tac-Toe
I wrote a simple tic-tac-toe program in Haskell. It runs on the command line, has a one and two player mode, and implements a minimax algorithm when you play against it.
I'm used to writing proper ...
3
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1answer
37 views
C++ Template for one to many Registration (pre Gang of Four)
I use this template to lookup clients registered for data. The data is associated by name(key) and clients are shared pointers (value) to a class which will consume the data.
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1answer
49 views
Encapsulating Complex Calculation in JavaScript
This is code for performing a calculation that should be repeated with different levels and temperatures. I am concerned about the organization of this code as I feel it may contain too many helper ...
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1answer
76 views
ASP.NET MVC application architecture fit for Unit Testing with Mocking
I am trying to learn how to professionally work with Unit Testing, so I have refactored a medium sized project of mine (a sort of article aggregator that also does some ...
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1answer
70 views
How Godly does an object need to be before it becomes unholy?
I've been told that using God objects at all is a Bad Thing™
In object oriented languages, God objects know all, they control too much. I'm trying to build a game (or for the scope of this question a ...
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3answers
24 views
Filling name accounts
I think the content is too large and I am deeply think about how to refactor it. Does anyone have good advice on refactoring it?
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1answer
89 views
Refactoring of a client API to avoid duplicated code and unclear passage of parameters
I need to develop an API. The functions of the API are requests that call the services exposed by a server.
Initially the API worked like this:
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6
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4answers
240 views
Simple factory retrieving object by name
Despite the fact that this code works, I would like to know if there's any situation I did not anticipated, and/or if what I am trying to do is some what wrong.
-std=C++11 flag needed
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5
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1answer
74 views
Model of an mp3 player with state and prototype design patterns
After reading about design patterns in general, I decided to try and incorporate them in an actual program. I chose a State machine for my first exercise, or, more concretely, an MP3 player. The ...
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1answer
94 views
To read a book thou should have it bought, to buy a book thou should have it found! (Search Abstraction)
I started a hobby project to find the books that I read (paperbacks) so that I can keep track of them (reading start date, finish date, number of pages, etc..)
The first challenge was to find the ...
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1answer
99 views
Is my design is still a state design pattern, or some abomination?
I was trying to review state design pattern, and tried to create flexible implementation of it so it could reuse it in future.
So I came out with this:
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2answers
82 views
Query Builder pattern with use of FluentApi
Recently, I've come up with an idea of building a custom query builder combine with FluentApi.
Expected usage:
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3answers
156 views
Unit of Work Pattern for creating users
CreateUser function assumes the data being delivered via parameters are clean and gets called or initiated from the Business Manager (another class). This function is responsible to do the following ...
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2answers
63 views
Is there a better way of modeling the routines in my operations that doesn't involve PROTECTED fields?
In my application, well-defined operations on collections of business entities are modularized and carried out using one or more routines, each of which operates on a unique type of data associated ...
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1answer
123 views
Using commands as deferred behaviour
I was thinking of building a really flexible fluent API for my persistence layer. One of my goals is to achieve somehow the following result:
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2answers
132 views
Executing a stored procedure with optional attributes
Lately, I have been reading Uncle Bob's Clean Code book, and decided to try and follow some of his principles to make a class that was a somewhat confusing static helper class, with an abundance of ...
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3answers
159 views
Using factory pattern to create email templates
Firstly I try to explain my model.
I have 3 type of notifications which can have N types of email templates related to a specific status.
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0answers
42 views
Arbitrary function redirection at runtime
This code is for my upcoming challenge on PPCG. The key part of this challenge is supposed ability to overwrite functions that other people have written. Overwriting functions will happen at ...
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1answer
105 views
Abstract Factory Pattern
Hi everyone I've just done an exercise on the abstract factory pattern.
And I want someone corrects the exercise by telling me if I follow the rules of the abstract factory pattern or not.
Here is ...
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1answer
39 views
List of variables, split based on pattern
In my application i keep repeating writing this pattern. I just cant figure out how to write it better. Coming to you for suggestions:
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2
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1answer
100 views
Strategy pattern implementation feedback
I would like to have some feedback on my code, basically because I have been spending a few hours visiting other options before I ended up with this one, so I'm not sure I'm clear enough to value it.
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3
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1answer
53 views
Mapping different classes to the same database table
I have several very similar subclasses that I (think I) want to be stored in the same database table. Most of the fields are identical, with each subclass adding 1 or 2 custom fields. My code is using ...
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2answers
53 views
Anti-pattern or acceptable way of using Promises? [closed]
Whenever I need to use a Promise interface in my NodeJs code and I don't have a promise to start off with, I do this:
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0answers
37 views
Visitor Pattern in Ruby
After reading about the Visitor pattern, I wrote this example in Ruby, loosely based on a Java implementation on the wikipedia page.
The choice between modules and classes felt somewhat arbitrary for ...
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3answers
108 views
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3answers
133 views
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1answer
93 views
Price calculator for motors and pumps
Note
This question was born in request to post more details from this question on Programmers. Since details may uncover new/different complexity, I'm asking another question here. I also will use ...
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0answers
20 views
Storing object converters, data sources, loading and updating configurations
I have a static class Configuration holding two collections: one for object converters an the other one for data sources.
When I load a configuration from either ...
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1answer
21 views
Custom DataGridViewColumn to replace a DataGridViewComboBoxColumn
The issue that i'm trying to fix with this code is simple
I have a huge dataset and I have to bind it (as readonly) to a DataGridView
In that dataset I have some ...
6
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1answer
220 views
Saving data in local storage
I have written a small library for saving data on local storage. I am still a learner and I am not sure whether my code is OK for a production level application.
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7
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1answer
111 views
Simple console Snake game following GRASP
I would like to know if there is anything that I missed following the GRASP patterns.
The Main Controller class:
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1answer
52 views
QuickSort - 3 pivot choosing methods via factory
I'm happy to hear thoughts and ideas on structure/performance/testing/whatever and multi-threading, which I haven't gotten into yet with Python.
Latest code here. Assignment file and a few test files ...
3
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1answer
136 views
Controller class pattern
The GetDropdownList() function is being called on a couple of controllers based on this example and it may be called in many other controllers, so this code is ...
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1answer
51 views
