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

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0
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2answers
166 views

Interface (contract), Generics (universality), and extension methods (ease of use). Is it a right design?

I'm trying to design a simple conversion framework based on these requirements: All developers should follow a predefined set of rules to convert from the source entity to the target entity Some ...
4
votes
2answers
139 views

Strategy to use two different measurement systems in software

I have an application that needs to accept and output values in both US Custom Units and Metric system. Right now the conversion and input and output is a mess. You can only enter in US system, but ...
1
vote
2answers
51 views

Should I reference a CopyOnWriteArraySet from the Set interface?

There are two ways to use a CopyOnWriteArraySet: // A Set<Object> set = new CopyOnWriteArraySet<>(); and // B CopyOnWriteArraySet<Object> set = new CopyOnWriteArraySet<>(); ...
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votes
1answer
103 views

Single database, multiple system dependency

Consider an environment where we have a single, core database, with many separate systems using this one database. This leads to all of these systems have a common dependency, which ultimately ...
4
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2answers
370 views

How to layer if statements when order of logic is irrelevant?

Basically I have a series of logic in my website that can lead to 5 total outcomes. Basically two different if tests and then a catch all else statement. For example: if cond1: if mod1: ...
0
votes
1answer
65 views

How should I design a wizard for generating requirements and documentation

I'm currently working in an industry where extensive documentation is required, but the apps I'm writing are all pretty much cookie cutter at a high level. What I'd like to do is build an app that ...
3
votes
2answers
216 views

How do programmers handle several versions of a same program? [closed]

A lot of apps, for instance, have a free version and pro version. Do programmers, when a new update is released, remove lines of code that shouldn't be available in the free version? As for Visual ...
1
vote
4answers
158 views

When should a method of a class return the same instance after modifying itself?

I have a class that has three methods A(), B() and C(). Those methods modify the own instance. While the methods have to return an instance when the instance is a separate copy (just as Clone()), I ...
55
votes
12answers
15k views

What is the ideal length of a method? [closed]

In object-oriented programming, there is no exact rule on the maximum length of a method , but I still found these two qutes somewhat contradicting each other, so I would like to hear what you think. ...
1
vote
1answer
131 views

Changelog Management [closed]

I'm currently developing a WinForm application. In order to inform the client about the improvements and corrections made during the last version, I would like to manage and display a changelog. I ...
2
votes
4answers
358 views

How should I approach this from a problem-solving point of view?

I'm currently working on a project to replace some excel worksheets. There is a lot of industry specifics that change quite often and nobody really knows how things should be but every sure enough ...
0
votes
3answers
392 views

What is the general definition of something that can be included or excluded? [closed]

When an application presents a user with a list of items, it's pretty common that it permits the user to filter the items. Often a 'filter' feature is implemented as a set of include or exclude rules. ...
1
vote
2answers
324 views

How to approach program design with respect to data strucutres and algorimths - is there an equivelant of the OO design process for d.s.'s + algs? [closed]

My applogies for probably the worst written body of text I have produced in my life and many thanks to those willing to plough through it all. I was (and still am) not able to clearly express what I ...
0
votes
2answers
109 views

How would you create a program where two objects randomly move throughout the screen BUT never collide? [closed]

they are free to move anywhere on the screen weather in straight lines or curved ones just as long as they don't be at the same place at any given time. btw I'm not asking how to write it in code, ...
1
vote
2answers
146 views

Where should the “not empty field” validation code be written on a 3-layer application?

When working with the 3-layer model, where should the validation code be placed? for: not empty fields, unchecked options, null values, wrong-written dates, etc. To keep total isolation between a ...
0
votes
2answers
185 views

How would I implement this application idea? [closed]

I am a D&D gamer and a developer that has mostly worked with ASP.NET applications professionally. I have written some chat bots in Node.js and I have only played a little with PHP but wrote ...
2
votes
0answers
71 views

Dealing with class optional dependencies

I am wondering how are you guys handling an optional class properties. Let's say I have a product that can bud doesn't have to have a color property. Is that really the best way of doing that? Should ...
2
votes
3answers
223 views

Phone Number based Login

I'm trying to implement a phone number based login and not sure if I should ask the users for full number, i.e country code + number or just the number. What I have in mind so far: Attempt ...
0
votes
2answers
332 views

How often do you refactor or restructure your code in long term projects? [duplicate]

As developers we are always eager to learn new things and better ourselves at what we do. You've all had moments when you look at your old code and get that feeling: "WTH, I can't believe I used ...
0
votes
1answer
143 views

How to generalize a classes that has identical function plus some additional function

I have some designing problems with my project. To illustrate my problem, I'll use the following two classes from my project. public class RAM_UserManagement{ private Map<int,User> userList; ...
0
votes
0answers
85 views

Fixing data duplication in two similar tables in different databases

I'm currently doing maintenance on an old order system that has grown into the poster child for bad coding practice. One of the tings I'm dealing with is a lot of data duplication, which I want to ...
0
votes
0answers
96 views

Design decision for implementing the cache re-arrange logic

I'm working on a webapp which has an existing framework to cache values from the database. I have a requirement which needs multiple values from the database and the values have to be ...
0
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2answers
119 views

Which layer should service errors be handled in?

I am coding in a multitier architecture in Java, and I perform a query to a web service. Is it better form for the errors returned by the service be handled in the data access layer or in the ...
1
vote
1answer
91 views

Doesn't an event bus affect global state?

"Minimize mutable global state" is a more or less accepted program design principle. The reason often cited is that having global state can affect two components that don't are seemingly unrelated. In ...
2
votes
2answers
79 views

What is the point of writing WCF Interceptors, compared to using a helper method?

For those of you who don't know, WCF allows you to attach interceptors to methods in the service contract. The interceptor is capable of performing custom logic before and after a method call, and is ...
4
votes
1answer
133 views

Designing module interfaces

I'm studying software engineering and one thing I'm really trying to improve is my skill in software architecture. My question is quite broad, so I'll try to explain it with an example. Suppose you ...
2
votes
1answer
174 views

How to store satellite data in C data structutres

I've been reading through Introduction To Algorithms 3rd Ed, and am really enjoying the material; however, I am having difficulty in implementing some practical situations. It's not the theory, or ...
0
votes
1answer
63 views

Pattern or idea to communicate with async hardware

This is more like a theory question than a practical one. And although I am using Arduino and Labview, it should work independently of the platform. I have an Arduino board controlling a set of pumps ...
1
vote
2answers
1k views

Is this proper OO design for C++?

I recently took a software processes course and this is my first time attempting OO design on my own. I am trying to follow OO design principles and C++ conventions. I attempted and gave up on MVC for ...
0
votes
3answers
130 views

Assigning responsibility for cancelling an Order

During a conversation with our Domain Expert we can across this feature: A Customer service agent can cancel an Order by decreasing its quantity. To cancel an Order we decrease its quantity by the ...
2
votes
2answers
143 views

What metadada to save and whether to include it inside the binary file?

I'm wondering if there are any general guidelines or best practices regarding when to split data into a metadata format, as oppose to directly embedding it within the data. (Specific example below). ...
10
votes
6answers
1k views

Designing database related methods, which is better to return: true/false or row affected?

I have some methods that perform some data changing in a database (insert, update, and delete). The ORM I'm using return row-affected int values for those type of method. What should I return for "my ...
1
vote
2answers
76 views

Creating fast, realtime dialogue search for television scripts

We have a database of television scripts and we'd like to search it, getting results as we type. We often remember words or snippets of dialogue but can't remember exactly what was said or what ...
0
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2answers
162 views

How to route messages between clients using a central server in Python

I've got three Raspberry Pis sitting around. I want 2 of them to be able to chat while the 3rd routes the messages (acts as a server between them). The general flow of events should be something like ...
2
votes
1answer
332 views

Things developers do before the coding phase [closed]

I'm a new software developer, and in my internship my boss asked me to develop an application that allows him to manage his inventory. Something small but, for me, very enriching. The application is ...
1
vote
5answers
191 views

Choosing a class abstraction when multiple viable approaches exist

I'm having trouble trying to design a class structure for some search functionality. It's quite possible that I'm approaching this incorrectly altogether, but putting that aside I'm curious how other ...
1
vote
1answer
76 views

Data generation system modular design

I am trying to think of the most sensible way to design the architecture of a data generation system with several steps. Data in the system goes through several transformations which can be divided ...
8
votes
9answers
7k views

Use constructor or setter method?

I am working on a UI code where I have an Action class, something like this - public class MyAction extends Action { public MyAction() { setText("My Action Text"); ...
0
votes
3answers
379 views

How do you make a service stateless?

When doing Domain Driven Design it is advised that services should be stateless. There are several kinds of services when doing DDD: Application services. Domain services. Infrastructure services. ...
4
votes
2answers
123 views

How would you approach errors notification?

Recently we had a discussion with my colleagues caused by my intentional attempt to generate user friendly message about occurred error (business logic) at the server side. They insisted on putting ...
3
votes
2answers
238 views

What is the reasoning behind these design choices? [closed]

In ReactJS tutorial you are guided in the building of a commenting system. It's a very useful tutorial to understand ReactJS library, but there are some design choices I can't fully understand. So ...
7
votes
3answers
429 views

Recommendations on integrating DI/IoC container into an existing application

I am now faced with integrating an inversion of control (IoC) container into an existing application, and I'm looking for some recommendations on how that can most easily be accomplished with the ...
2
votes
3answers
271 views

Uses for System.gc() in Java [closed]

In Java, there is a method called System.gc(), which calls the garbage collector (or rather, "suggests" to the JVM to run the GC). Are there valid reasons to call this method? I'm thinking that it ...
2
votes
4answers
2k views

Why would the switch from C# to scala make sense in order to take advantage of scala's functional capabilities? [closed]

What is the benefit of using functional program for large scale software projects? I have heard it is pretty performance equivalent to regular OOP. I also have heard that it is more "mathematically ...
0
votes
3answers
79 views

Structuring an application that reads from a .properties file

I have a Java app with three classes: Foo, Bar and Baz. All three depend on a bunch of what are currently constants defined in each class in order to determine how to run. On top of that, Baz ...
2
votes
3answers
105 views

How to maintain view-related information in MVVM and may I store this in the model?

I have an ongoing discussion with some colleagues on how to manage the views to our model. We've got a model which may be represented by many views. Let's say we've got some data that is stored in an ...
7
votes
4answers
485 views

“Immutable” interfaces

I am confused about the notion of immutability. Consider the following structure of a simplistic calculator: Here are the interfaces: interface IOperationalInterface { int Sum(int a, int b); } ...
0
votes
1answer
163 views

Does lots of Instance Variables within my class suggest flawed Design?

Ok so I am setting out to consolidate some learning I have been doing. What I am going to do is create a small game relating to a game I enjoy called Persona. For reference a persona you can think of ...
0
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1answer
90 views

I recently read about unit of work and repository design patterns; working with EF wondering if this is a good design pattern

I found myself creating child records that require a master record to exist, first, so that they can reference it by the master record's primary key (if that's the right term). To accomplish this ...
1
vote
1answer
112 views

Domain-specific Interfaces

Are there any real benefits of using interfaces over abstract classes in a domain model? Does anyone have any experience using interfaces in a domain model in a real project? From a technical ...