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

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1
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0answers
75 views

Design of a datamodel in a OO way

I'm looking for some advice how to design a datamodel in OO way (C++ in special). My problem: The user input in runtime is a 1D matrix A = (a0,...,an). The program creates - on the basis of A - ...
1
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1answer
168 views

Is it OK for an interface to only communicate half of how something should work?

I have a service where certain other services can report their status to. By status I don't mean whether they are running or not, but whether they have received data. The point is that other services ...
1
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0answers
78 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 ...
2
votes
1answer
121 views

Suitable software development method/model for R&D Projects

For Research and Development (R&D) project, what type of software development method / model more applicable/suitable? For example, my recent R&D project has several parameters: Requirement ...
1
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1answer
78 views

ADT design choices

How do you go about deciding which of the following two representations (in F# syntax) is the right choice in a particular situation? type Choice = A of string | B of string Or: type ChoiceKind = ...
0
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2answers
104 views

Track a series of choices with a single number

I want to track a series of scored questions in a single number (the total score). Is that possible? and how? For example, I have 30 questions with either 3 or 2 choices. For any given question, the ...
24
votes
5answers
1k views

Saving an object via a method of its own or via another class?

If I want to save and retrieve an object. Should I create another class to handle it, or it's better to do that within the class? Or maybe mixing of both? Which is recommended according to OOD ...
0
votes
4answers
442 views

Is it bad to use DI to inject constructor parameters at runtime?

These are two classes, the first one I inject an instance of type IEngine while the second one I inject owner's name, tickets and engine. Version 1: public class Car { public Car(IEngine ...
8
votes
3answers
793 views

Decentralized Data Management - encapsulating databases into microservices [closed]

I've recently been taking a course on Software design and there was a recent discussion/recommendation about using a 'microservices' model where components of a service are separated into microservice ...
3
votes
1answer
252 views

Introduce Data Transfer Objects or expose complex data model in REST

We are working on an MVVM application. Jersey (backend) exposing a REST interface and AngularJS (frontend) being the only consumer of this interface. The application uses a complex database model ...
6
votes
1answer
299 views

In MVC should a model contain subview models?

Some background: A colleague and myself have different interpretations of MVC which means, given the same problem, we are coming up with radically different solutions. He comes from a Java background ...
1
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1answer
354 views

Creating a calendar/planner program. Confused about OO logic?

I'd like to create a piece of software that has the functionality of a common written planner. To do this, it will have a Calendar. When planning the program, I became confused as to how I would ...
3
votes
1answer
554 views

How to programmatically connect to a particular PC of unknown IP from a WiFi network?

I want to connect and transfer data between a PC and an Android device both of which are on the same local WiFi network. I cannot use the local IP as such in the code to actually get the connection ...
5
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3answers
269 views

How to handle a memory consuming member variable

Suppose multiple objects of the same class should do something which takes a memory consuming resource. Which of the following approaches is recommended to define and use the resource by the objects? ...
2
votes
1answer
128 views

Should a web app for a service access its data via its own API or directly?

I'm building a service that will consist of mobile and desktop apps, which will require me to build my own RESTful web API to easily keep the data for the service in sync. I am also building a web ...
1
vote
3answers
224 views

Member variables vs. State Varaibels? Are they the same? [closed]

I am learning that member variables are to hold the state of an object? Is it their recommended usage? Are all member variables state variables too? or state variables have specific definition and ...
0
votes
1answer
108 views

Should Form Object be considered a DTO?

I got this from one of online video tutorials. Author binds form data not to Value Object directly, but first to validable DTO, and THEN to Value Object, using service. Example: package ...
3
votes
4answers
246 views

How do you handle versioning in a multi-sided project?

I know it's a broad question so I'll try to be as specific as possible. This question is more an "organisational" question than a technical one. We have a multi-sided project with these main ...
0
votes
1answer
54 views

Incorporating web designer's into a rails app

I have a designer who has great knowledge of HTML, CSS and JavaScript (Not jQuery or AJAX though). He gives me his designs in those files and I have to incorporate it into my apps. The site is not ...
2
votes
1answer
107 views

Unique_ptr to hold memory for custom VM

I work for a company that use a custom DSL and my job is to port the VM to C++. I'm trying to do this in compliance with the C++11 standard so i use auto when appropriate, the new for syntax, etc. ...
1
vote
2answers
88 views

Design for a shared checkout

I am currently working on a ecommerce system that is slightly different in structure to a typical ecommerce system in that you have multiple stores, accessing the same database from different URLs. ...
0
votes
3answers
165 views

Should simple tasks be divided into separate functions? [duplicate]

If I have to write a simple program (25-35 lines), should I divide it even further, in functions which have a few lines and get executed max. 2 times, or to put it all im one? e.g. if I need to add ...
1
vote
0answers
83 views

Design architecture and software for webapp integrating with few other endpoints (Email Server, Jira, CRM system)

In my upcoming project, I need to integrate a webapp with few other endpoints. Main duty of the webapp will be some kind of thin-client for inner JIRA system for company. Moreover, I'll need to ...
0
votes
3answers
298 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 ...
3
votes
3answers
513 views

Should an object load itself?

although I'm programming in C++ for some time now, I'm always faced with design decisions (probably due to the language's flexibility). One such problem is deciding if a method should be part of the ...
18
votes
8answers
2k views

Is it normal for a programmer to not have 100% clarity over their own code at times? [closed]

I'm not an expert programmer so this may be why, but I've come to notice that whenever I create complex code (like a Chess game I recently made), I am able to write the correct code to get the program ...
0
votes
1answer
111 views

Async properties in interfaces to cater for the possibility of expensive first-time evaluation: Is this a good idea?

First of all, sorry if this post is too long. I'll start with the… Short version: Is it generally advisable or a good idea to design an interface property as asynchronous simply because we cannot be ...
0
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1answer
90 views

How to determine which service to call

I have modeled my application using multiple 'user' domain objects. Candidate Recruiter Administrator Each entity extends from an AbstractUser implementing UserInterface. interface UserInterface ...
0
votes
3answers
137 views

Communicating between unrelated components/objects

Imagine that I have a game, with Monsters, Missions, Vehicles, and of course their controllers and such, so a Monster class, Mission Controller class, Vehicle Controller class and so on. Suppose that ...
1
vote
2answers
91 views

How to solicit new product recommendations from existing clients?

My company is working on developing a new product that is similar (but larger in scope) than our existing, primary application. It will incorporate most of the functionality of our current application ...
0
votes
1answer
118 views

Using entityManager/repository Class/session factory directly in controller

I wonder what is your approach on following subject: let's say we have MVC structure with entities, repositories, controllers and service layer. My approach to use above was pretty clear for me: ...
1
vote
0answers
64 views

Need to refactor file downloader and post processing utility [duplicate]

Not sure whether this is the right forum to ask this but here goes. Using this solution - http://stackoverflow.com/questions/26571351/replacing-if-else-logic-with-state-strategy-pattern I was able to ...
1
vote
1answer
305 views

Inheritance, Composition and Protocols

I'm reading a book on general object oriented concepts to try and gain a solid understanding of everything. One thing that is throwing me off is the difference between Inheritance and Composition. I ...
7
votes
1answer
195 views

Null Object Pattern and Input validation - copy real implementation or silently accept everything?

I have a WifiComponent in my Camera in my client application. It's responsible for handling the Wifi-related functionality of the Camera. The Camera represents a real world camera. This WifiComponent ...
1
vote
1answer
198 views

Should we use data object (or the data transfer object) for sharing data between these three classes?

I found an article by Martin Fowler that has made me doubt my design choices, particularly about data objects. Martin Fowler has written an article about what he thinks is a code smell. In this ...
1
vote
0answers
70 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: ...
1
vote
1answer
239 views

How do you keep control in a large software project? [duplicate]

I've a large-ish software project that I'm the sole developer for (~80KLOCS and counting - I know there are much larger projects out there, but it's an order of magnitude larger than I've ever had to ...
1
vote
0answers
114 views

The Python module-as-singleton hack

I've seen (and once used) this idiom a few times in Python: # At the end of a module: if __name__ == '__main__': main() # or whatever your entry point looks like, this line isn't important else: ...
1
vote
2answers
264 views

Mocking the context of application

We have a context of the application which is a static class named Holder containing several static properties initialized by objects that are used throughout the application. All over the unit tests ...
3
votes
2answers
170 views

OOP CLI menu structure organization?

This problem has kept me from pursuing a project I'm working on because it influences the entire structure of the application. This question has been briefly touched on here, but I feel that it wasn't ...
0
votes
3answers
152 views

Store an object's name in the object or externally?

I'm in the process of building an application which needs extensive logging of points in time at which certain events happen. For example when it renders a sequence of different shapes to the screen ...
1
vote
1answer
106 views

Software to access GSM Terminal, sending and receiving AT commands, validating results

I am currently implementing a software that uses a GSM terminal to perform actions. Actions can be sending messages, checking balance, receiving status report messages, setting the pin, ... The ...
0
votes
0answers
45 views

How to clean composition root from anything other than object construction?

I'm doing poor man's DI (manual injection) in my application. My (pseudo-) composition root looks something like this: var connectionSettings = new Settings(SqlParameters) var dataLoader = new ...
1
vote
2answers
154 views

Cleanest choice for symmetric operations

I have a need to do some processing from a format A to a format B and from B to A. The job in one direction is very similar to its counterpart. Both formats are represented with an interface Msg. In ...
5
votes
1answer
387 views

Having many versions of an application [duplicate]

Basically the scenario is this: There is one main version of an application but it is modified for each client. The development is usually through the version that is currently worked on All the ...
3
votes
2answers
194 views

Designing a system to archive databases with referential integrity

I have a very large Oracle database, with many many tables and millions of rows. I need to delete some of the rows end-to-end. By end-to-end, I mean, if I want to delete a row from a table then I must ...
-2
votes
1answer
64 views

Naming of classes [closed]

I am creating an Email sending client. My POJO domain model conssts of 2 string fields, userName and userId. My thought process around designing the classes was to club these 2 fields into a domain ...
0
votes
0answers
35 views

Managing allocation calendars for an employee set [duplicate]

IN view of creating a MIS (Management Information System) one architectural/design issue that's confronting us is managing allocation for set of employees. Scenario: Employees get allocated to ...
0
votes
0answers
160 views

How to design multiplayer online game with a battlefield?

I'm designing a simple game where all players use one battlefield via browser. I'm using websockets. So I'm wondering should I always send all data about battlefield to every user when smth is being ...
0
votes
1answer
139 views

How can I write these services using SOLID and keep them easy to test?

I am trying to write a couple of classes using SOLID principles and having some trouble. The problem is quite simple. I have an application that tracks leads. Leads are created when events are raised ...