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

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2
votes
1answer
50 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
208 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
74 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
142 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
101 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
289 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
331 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
113 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 ...
0
votes
1answer
90 views

Flat files for events and alarms

So I'm working on a project that I was introduced to a year ago. One of the features of project involves alarming the users when certain events are triggered. There is also a log of these events. ...
2
votes
2answers
122 views

OO Design Question - Library/Objects for API which includes id references

Public api: getClients / getClientById - returns a json object like: { clientid: 1, name: "Client1" } getProjects / getProjectById - returns a json object like { projectid: 5, name: ...
4
votes
2answers
271 views

IoC invalidation

I have a bunch of services that get registered as singletons by my IoC container on startup, all of these services have a constructor which takes in a connection string which is used by the underlying ...
4
votes
1answer
346 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
258 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
368 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 ...
4
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
137 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
10k 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 ...
2
votes
1answer
78 views

Reuse already fetched data for request

I have action that fetches user model from db to check access. Then I have method that in some cases requires same model. function checkAccess(req, res, next) { var data = ...
1
vote
3answers
98 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
174 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 ...
0
votes
1answer
52 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
83 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 ...
0
votes
2answers
114 views

Content delivery design

I'm designing a system where users can access files stored in an external content storage service such as AWS's S3. Here's a simple diagram: ------ ------------ ----------------- | User ...
1
vote
1answer
116 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 ...
3
votes
2answers
831 views

How is intermediate data organized in MapReduce?

From what I understand, each mapper outputs an intermediate file. The intermediate data (data contained in each intermediate file) is then sorted by key. Then, a reducer is assigned a key by the ...
1
vote
2answers
355 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 ...
1
vote
4answers
2k views

iOS chat application design, sending/relaying the message over to the end user

I have a design question. Let us say you were tasked with building a chat application, specifically for iOS (iOS Chat Application). For simplicity let us say you can only chat with one person at a ...
2
votes
1answer
99 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
104 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
681 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 ...
1
vote
2answers
215 views

Best approach for a server configuration data collection and reporting solution from a legacy script?

I have a project which involves collecting config data from windows servers in our (very large) server estate. My manager wants me to collect over 150 data items across all configuration areas ...
6
votes
1answer
207 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 ...
78
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
5k 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
305 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
298 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
182 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
356 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
552 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
442 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
528 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 ...
2
votes
1answer
58 views

How to approach the creation of a “Unit Outline” generator?

I am the Studies Coordinator at a College and we currently have somewhere in the order of 100-200 unit outlines that are created at the beginning of each semester. Those outlines need to have ...
0
votes
1answer
324 views

How to update User interface form through database update

I have a client server application. Assume I work as a Support executive, resolving customer tickets. We(our support team) have got two tickets to work on. Ticket 1: Client "Liver" raised a ticket ...
24
votes
6answers
3k views

Can you implement “object-oriented” programming without the class keyword?

Say we want to provide an abstraction of an "account" in a bank. Here's one approach, using a function object in Python: def account(): """Return a dispatch dictionary representing a bank ...
1
vote
1answer
123 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
vote
2answers
128 views

Should constructors for API classes ever be public, or can a factory always be used? [closed]

I'm surprised this doesn't seem to have been asked before, or at least I can't find it anywhere. I know this is more of a philosophical question, but is there any particular reason not to use a ...
6
votes
6answers
698 views

What are the most used pattern to manage a lot of interconnected parameters?

I recently start to work on an application that drive different measurement device. Before the user start a measure, she sets the parameters of it. Actually, considering all measurements type there ...
1
vote
2answers
118 views

Alternatives to using dictionary in parameters in C#?

I have a method that takes in a dictionary and enum value and produces a string output. Enum value defines what template string to insert the dictionary key value pairs into. public string ...