Questions about problem solving and planning for a solution through software design.

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2
votes
3answers
133 views

Performing data operations that involve separate applications and data sources

I'm designing an enterprise application that produces output based on some input data from another application. In this case, I happen to have also built and thus do control the source application ...
1
vote
1answer
39 views

How to model table and column objects and their relation

I'm working on a small application where I need to model tables and columns from a relational DB. I've been reading some material on nested classes, which is recommended to be used sparsely. However ...
3
votes
3answers
130 views

Returning a Flag Indicating Success

Whenever I'm writing code, I always stub out my methods like this (not necessarily using generics): public T MyMethod() { T result = default(T); // or null return result; } This always ...
4
votes
4answers
125 views

Instantiating class that contains methods to check some of the settings and also return values from my app.config file

I am writing a console application and have a class called ApplicationConfiguration that contains methods to check some of the settings and also return values from my app.config file. For instance ...
1
vote
1answer
97 views

Database Design: Rules for students and student groups

I am new to databases. I am using MySql. What I have is a student system which stores rules for students in a school. Each student may or may not be a part of a group (Soccer, Guitar, etc). ...
8
votes
5answers
2k views

Best-practice to manage concurrency into a basket in a e-commerce website

What is the best practice to manage the case where two customers add in the same time a product whose the stock was only 1 ? Must there be a check in the code of the basket to avoid one of these 2 ...
0
votes
0answers
43 views

Design for local text storage (70 000 words) in iOS

I would like to code an interactive story app for iOS devices. There will be a large amount of words locally stored.(70 000, 35 000 for each language as the text will be available in two languages). ...
0
votes
1answer
93 views

Moving methods to a MasterClass so it can be overridden, is there a better way?

I'm looking at a very large object within the application I'm working on, which is there to basically hold all the data together at a large level. Recently, we have started moving some methods out of ...
12
votes
9answers
657 views

Inheritance gone wrong

I have some code where a good inheritance model has gone downhill and I am trying to understand why and how to fix it. Basically, imagine you have a Zoo hierarchy with: class Animal class Parrot : ...
2
votes
3answers
117 views

Unit testing text output

I have recently become responsible for a legacy tool that analyses code and provides a log as output. As part of the JUnit suite for this, there are ~100 tests that rely on successfully matching the ...
0
votes
2answers
146 views

Testable design in Swift

I've been searching for so long about how to design testable classes in Swift but every information site just describe basic stuff like how to test, how to assert, why is testing good... My current ...
0
votes
2answers
52 views

Built-in the separate thread execution inside of the method or wrap the method by the thread

Let assume, I have some resource and time-consuming code, which I want to arrange as a separate method. In order to optimize the performance, this code should be executed in the separate thread. Now ...
0
votes
0answers
40 views

Event-handling in WinForms MVC-Implementation

I am trying to implement sort of an MVC-Pattern (Passive View) for a winforms-application to clean up the code. The basics are quite clear and I did implement some views of the application in ...
0
votes
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 ...
2
votes
2answers
542 views

Is there a better way to organize my module tests that avoids an explosion of new source files?

I've got a neat (so I thought) way of having each of my modules produce a unit-test executable if compiled with the -DTESTMODULE flag. This flag guards a main() function that can access all static ...
2
votes
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 { ...
2
votes
1answer
60 views

Getting items from a ListView - without breaking MVC paradigm?

I've got an arraylist of SpecialParts. A SpecialPart is an object that holds a bunch of information about itself: name, ID, date created, etc. I've got a ListView that presents the user with all the ...
6
votes
3answers
216 views

Should instance of Employee contain a reference to instance of Office, or should Office contain an array of Employee?

Title is an abstraction of what I am actually doing, but in essence the same. The main entity I will be dealing with are the Employees themselves; "Send package to employee John Doe". In order to ...
1
vote
3answers
78 views

Event logging: record a whole message, or a list of properties and generate?

I've written a simple event logging system, which I write to with a function similar to: void IIncidentLogic.ReportIncident( string code, string noun, string hostname, DateTimeOffset ...
1
vote
3answers
151 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 ...
1
vote
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 ...
5
votes
3answers
328 views

Is REST only limited to optimistic concurrency control?

Context Due to the statelessness of the REST architectural style involving that each requests stands completely alone, leading server to never store any informations about client. Thus, pessimistic ...
3
votes
1answer
347 views

How would one go about creating a “Licence Key” for a distributable source-available Software project?

It has been a while since I have seen anything you can download which has to connect to license server in order to monetize a piece of software (and the last time I saw it, it went very wrong when the ...
0
votes
0answers
122 views

Managing code responsibility separation on large mobile app

I work for a large corporation with some different business units. Each of this business unities has their own group of developers. We have to build a mobile app that has features from each of these ...
81
votes
12answers
10k views

Is testable code better code?

I'm attempting to get into the habit of writing unit tests regularly with my code, but I've read that first it's important to write testable code. This question touches on SOLID principles of writing ...
5
votes
1answer
385 views

How to store satellite data in C data structures

I've been reading through Introduction To Algorithms 3rd Ed, and I am having difficulty in implementing some practical situations. It's not the theory, or implementing the internals of the data ...
-1
votes
3answers
279 views

Why List<E> interface is additionally introduced in collection hierarchy? [duplicate]

Below is the diagram, where, if we just consider the implementations of List, AbstractList maintains the core behavior of list. To introduce the new implementation class MyList(say) one can ...
9
votes
3answers
389 views

What is a good design for allowing backwards compatibility of files between different versions of software?

What is a good design for allowing backwards compatibility of a file type between different versions of software? For instance, how does microsoft get word 2007, 2010 and 2013 etc... to all open docx ...
5
votes
1answer
1k views

Best practices for using HTTP sessions(Java)

My Question is not about how to use HTTP session or how values are being used in session. Question is more oriented about approach. In my current application there are few values being stored in the ...
-3
votes
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 ...
15
votes
2answers
11k views

What alternatives are there to using HTML/CSS layouts for websites? [closed]

Is there any existing in-use, or even just conceptual attempts at creating a markup or programmatic expressions for designing the layouts of websites other than HTML/CSS? If there are others out ...
1
vote
3answers
106 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: public static class Download { public async static ...
3
votes
3answers
190 views

What is business logic code and what is data access code, and what's the difference?

I ask this because it seems people usually consider the code that goes into a DAO or Repository implementation as "data access code", while the code that directly uses these DAOs/Repositories as ...
1
vote
1answer
62 views

How to implement a NavigationManager class without using singleton pattern

I'm practicing on writing testable code. One problem I have ran to (researched a lot too) is singleton pattern. It's global state nature makes it unreliable to test because singleton's property ...
1
vote
1answer
91 views

What's the quickest and most maintainable way to implement SQL querying of disparate C++ variables?

I've recently joined a team working on radar observations. The team has access to a repository of software (written in C++) used for dealing with these observations, but their work is focused towards ...
1
vote
2answers
375 views

How does a search functionality fit in DDD with CQRS?

In Vaughn Vernon's book Implementing domain driven design and the accompanying sample application I found that he implemented a CQRS approach to the iddd_collaboration bounded context. He presents ...
2
votes
1answer
109 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. ...
3
votes
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 : ...
4
votes
1answer
696 views

DB schema for packaging products/services together under a single price/offer

I’m trying to “conceive” the business logic of this website that has many activities, that the users can build their “combo” and get discounts depending on their choices and how long they are willing ...
6
votes
1answer
224 views

IoC/DI design for class library

I am refactoring and introducing unit tests in a large application. It's currently a collection of static classes with static methods that return data, like such: // in data access project public ...
79
votes
8answers
7k views

Is this a violation of the Liskov Substitution Principle?

Say we have a list of Task entities, and a ProjectTask sub type. Tasks can be closed at any time, except ProjectTasks which cannot be closed once they have a status of Started. The UI should ensure ...
11
votes
6answers
7k views

Designing a REST api by URI vs query string

Let's say I have three resources that are related like so: Grandparent (collection) -> Parent (collection) -> and Child (collection) The above depicts the relationship among these resources ...
1
vote
1answer
315 views

Static methods vs Interface implementation

Here is my problem: I stared to create an e-commerce web site info collector. So I created a parser for each site. The parser class is stateless. I have got methods like: getItemPrice(WebElement ...
4
votes
2answers
300 views

implementing dynamic query handler on historical data

Context: I have historical data about property (house) sales collected from various sources in a centralized/cloud data source (assume info collection is handled by a third party) Planning to ...
3
votes
2answers
198 views

Storing session key in a hidden field

Background: I have a question which is outline at Use different local storage between windows. The very high level question is "How can I keep tabs and windows sessions from clashing". Requirement: ...
2
votes
4answers
367 views

what is the difference between overengineering, underengineering and rightengineering? [closed]

What is the difference between over-engineering, under-engineering and right-engineering at coding/design perspective? I found over-engineering: Coding too much like doing future requirement code ...
1
vote
1answer
124 views

What is the best way to remember a successful execution over several program calls?

I'm working on a build process, that is called manually over the command line. To check if it exited unsuccessfully during the build I want to set a lock file (symbolic link) and remove it on ...
12
votes
8answers
553 views

What to do if boss always postpones major decisions about requirements and overall design?

When starting a new project, my boss always avoids to make fixed decisions. He is usually saying: ok, just start to write something and be as generic as possible. When you're finished we look how we ...
1
vote
3answers
510 views

Bad Practice using Auto Generated Classes for Data Access

I've seen this before but haven't found concrete reasons. When you add Entities to your EF model, EF auto generates classes for these entities. In terms of DataAccess, why is it preferred to not ...
9
votes
2answers
530 views

Single-responsibility and custom data types

In the past months I've asked for people here on SE and on other sites offer me some constructive criticism regarding my code. There's one thing that kept popping out almost every time and I still ...