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

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1
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2answers
41 views

DLL or web service for common functions?

We have a variety of basic functions (date utilities, email sending, internal math calculations, etc) that are currently in an old VB.NET project. We're going to move towards C# and I'm wondering if ...
6
votes
4answers
249 views

Is Visitor Pattern valid in this scenario?

I am a beginner in Software Development, and recently I have a design problem which bothers me a few days. The goal of my task is to design a small system, which can run scheduled recurring task. A ...
0
votes
2answers
63 views

How should an API or server respond when a device connects with a different account than it is bound to?

In my system we have users accounts and user devices. Rules: A user can have only one user account. Each user can have many devices. A device can be bound to only one user account. Upon initial ...
1
vote
3answers
86 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 ...
-2
votes
1answer
74 views

Java - Concept question: LinkedHashMaps vs POJOs?

EDIT: I'm just going to ask a single question instead of presenting a problem and asking for advice on a specific design decision in the solution. Given a batch of data from a database, collected ...
1
vote
2answers
108 views

When writing a library or an API, when should and when shouldn't I validate or automatically correct errors in data provided by another developer?

I have a fairly good understanding of when data validation should and shouldn't exist when it comes when writing an application that is only dealt with by an end-user, and all the different tiers of ...
6
votes
3answers
263 views

Quick and Good: ( Requirement -> Validation -> Design ) for self use? [on hold]

How to casually do the required Software Engineering and designing? I am an inexperienced developer and face the following problem: My company is a start up and has no fix Software engineering ...
1
vote
0answers
40 views

How to expose the domain model as options to drive the view behavior

First off, I'm not thrilled with the title, so I'm open to suggestions there. Here's my question: I'm designing a simple application that takes input from a user and produces an output document. ...
8
votes
5answers
9k views

Should I use abstract or virtual methods?

If we assume that it is not desirable for the base class to be a pure interface class, and using the 2 examples from below, which is a better approach, using the abstract or virtual method class ...
2
votes
2answers
112 views

Does this data processing pipeline design need to be so complex?

I have a data processing pipeline with well defined stages and IO boundaries. I can choose a language to suit the needs of this design. It starts with an InputObject. At the end of each stage, ...
-3
votes
1answer
65 views

What is the best way to protect highly sensitive algorithms in my code?

I develop software for day traders and institutional investors. Some of their algorithms are highly sensitive, but they still want to sell these programs to different customers. The programs ...
3
votes
3answers
191 views

Is this a good method to create class hierarchies?

Is it a good design to store the type of the object in the base class as an enum? For example, consider the following hierarchy Expr --Unary --Binary --Const ----Int ----Float How to represent the ...
2
votes
2answers
189 views

Problems with OO design for application with pluggable components

I'm trying to refactor an ugly code and make it easly extendable in the future. The application should be nothing else but a series of components that have input(s) and output(s). The components ...
18
votes
6answers
10k views

What are the pros and cons of HTML5, native and hybrid mobile app approaches?

I want to develop a mobile application. I recently read an article on Telerik Forum, which compares among three types of mobile application and I don't know which one should I select to begin with. ...
3
votes
3answers
152 views

Design suggestions for converters in Java

I'm trying a set of converters which will convert an object to some older form. And there are different objects which are converted. By older form I mean changing the values of some fields and in case ...
1
vote
0answers
45 views

Best architecure approach to develop iOS app

I'm trying to create a calendar app similar to this design: Calendar Design I'm currently using this calendar framework: CVCalendar and it's working great, but my question is, what do you think is ...
0
votes
0answers
34 views

How do I structure a URL with several querystring items? [duplicate]

I have a URL like this http://myserver/controller/action/var1/value/var2/value... Instead of ?var1=value... Is putting the variable name and value like that a good way to do this? I'm using a ...
7
votes
1answer
560 views

High resolution graphical representation of the Earth's surface

I've got a library, which I inherited, which presents a zoomable representation of the Earth. It's a Mercator projection and is constructed from triangles, the properties of which are stored in ...
4
votes
3answers
87 views

Parent class using methods defined in child

I am working on a large program (more than 10k lines of code). Below is a (hopefully not over-simplified) example of a problem I sometimes face: class MyClass1(object): def func_1(self): ...
1
vote
1answer
33 views

Synchronization of resource that has moved out of requests filter range

I have a RESTful API with corresponding clients. If a client request fetches a set of resources (Events) based on a filter, say events taking place between 2015-04-13 - 2015-04-19. If an event which ...
5
votes
2answers
90 views

Should program arguments have mixed interpretations?

I'm developing a command-line tool that has many user options. Some of the options are lists of values. I'd like the program to be able to parse these listed options directly from the command line, ...
3
votes
3answers
342 views

Best approach for tracking dependent state

Let's pretend I work on a project tracking application. The application is a database backed, server hosted, web application. In this application there are Projects which have many Activities which ...
2
votes
3answers
99 views

Rich object model in the context of a good REST API and of an existing rich object model on the server-side

First off, let's frame this question in the context of a good REST API and an existing rich object model on the server-side, as well as modern web architecture (MVC frameworks like angularjs). I'm ...
26
votes
5answers
1k views

How to explain why design choices are good? [closed]

As I've become a better developer, I find that much of my design skill comes more from intuition than mechanical analysis. This is great. It lets me read code and get a feel for it quicker. It lets me ...
2
votes
4answers
154 views

How wrong it is to have multiple associations between classes?

I'm modeling a college process, in which I have three classes: Student, Subject and Degree Degrees have their own subjects, students have a list of subjects they have passed, and also students should ...
2
votes
2answers
247 views

Refactoring long methods with a lot of cyclomatic complexity

I'm attempting to refactor what is becoming a very large method -- currently 350 or so lines -- that contains a high degree of cyclomatic complexity. I understand and ascribe to the theories that ...
7
votes
9answers
3k views

Multithreaded file copy

There is an utility we have which is used to upload files (and perform other operations on the file) to a network shared location. The file size tends to vary from a few mb to 500 mb. A suggestion has ...
4
votes
4answers
105 views

Business Layer Procedural?

The most common way I've seen of saving an entity into a database is through a class in a business / service layer. For example, when adding a new entity called User: User user = new User(); ...
-2
votes
1answer
42 views

I need to learn design for frontend developer jobs? [closed]

OK so I started to learn HTML and CSS. I'm going to start with JS and JQuery soon. My goal is to work as a front end developer. I did some searches on this site and so many people have said you need ...
1
vote
1answer
165 views

MongoDB Embedded vs Reference Private info

I have searched extensively for a similar Mongo schema design and can't find relevant examples. I have a store (with public info), each store has an account (with private account info). // store ...
2
votes
3answers
76 views

Large file / data transfer in a Microservice Architecture

My company is currently working on adopting a microservice architecture but we are encountering some growing pains (shock!) along the way. One of the key contention points we are facing is how to ...
1
vote
1answer
44 views

Design consideration on JSON schema for an API

I have an API endpoint that retrieve data from 3 SQL tables on the server-side. At the moment, I do a SELECT with joins, consolidate/reorganize the selected data based on a JSON schema, and then send ...
3
votes
1answer
86 views

OO design in a data processing pipeline

I'm wondering how to design a fairly simple class whose properties are complex to compute. Also, the properties depend upon each other for computation. An example using graphs and graph processing ...
1
vote
2answers
505 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
0answers
58 views

OOP vs ADM Comparisom

This is the ADM equivilant to the example code given in Correct placement of Methods in OOP In this example we have resolved the Method placement question by moving ALL methods away from the data, ...
-4
votes
0answers
23 views

Javascript Automatic Class Structuring Code [closed]

This is designed to make it easy to structure a large javascript project into its own independent classes/modules, then make those classes have easy access to their parent classes, all while keeping ...
3
votes
4answers
252 views

Design method to return List of objects

I need to create a method which will return a List of IRule objects. This is what I have written, am I correct in the approach? Or should I follow any patterns/principles? public IList<IRule> ...
0
votes
0answers
38 views

Nodejs app structure for extensive testing [closed]

I have been reading a lot about TDD and it's advantages. I plan to integrate it into my development process hence I wish to know what is the best way to logically(code) and physically(directory) ...
2
votes
4answers
263 views

How to optimize the application with huge number of database requests per minute

I have to provide free demo of some service to end users in my application. Free demo could be of 30 mins, 1 hours, 5 hours etc. (predefined time) for a new user for one time only. User can also ...
0
votes
2answers
35 views

How can I know if my data needs to be a react.js component?

I'm looking at React.js, and trying to see if it can help me with my recurring sets of data that I have on various pages. All the data is from a database, say a list of names and addresses, a tabular ...
0
votes
0answers
32 views

How to design an application with a settings widget [closed]

I have three major parts in my application. The main UI, the logic code, which is pretty well separated by MVC, and the settings UI. I have problems designing this bunch and I am constantly rewriting ...
1
vote
1answer
93 views

Is there a valid symbol for “two or more” with Crow's Foot notation?

I have a database design for which one entity of Class A always has at least two entities of Class B. Can I express this with valid Crow's Foot notation? One possible idea I had was this: Excuse ...
2
votes
1answer
191 views

Mental schema for SQL queries [closed]

While preparing SQL introductory material, I've ended asking myself about the line of thought followed by a developer when writing a query. I believe it could be too valuable from a beginner's point ...
5
votes
5answers
410 views

Training old timey fortran programmers to better code design. hints? [closed]

I need to quickly train Fortran 90 developers into object oriented design, good coding, and general coding practices to make code maintenance easier and accessible to everybody. Their current style is ...
2
votes
2answers
60 views

Design interface for WebService to access several MySQL databases

I am currently trying to design an interface for a WebService that can access several MySQL databases. There will be 4 operations available, Add(), Read(), Update() and Delete(). The WebService just ...
0
votes
1answer
78 views

Best Approach for Config File for CSV Parsing [on hold]

I'm writing my own CSV File parser using C#. Now I would like to provide some deep validation based off a config file. This config file will describe: How many columns to expect in the file. If to ...
1
vote
0answers
51 views

Improve communication between controller and trackers in a Twitter fetcher tool using RabbitMQ or Apache Flume

I've been working for a time with some researches developing a tool to fetch tweets from Twitter and process them in some way. The first prototype "worked" but became a pain as we used sockets to ...
-4
votes
1answer
168 views

Why is one language with elegant easy to read syntax as fast as one with the verbosity or explicitness? [closed]

There are 2 distinct types of programming language design categories in my eyes. We have C++/Java/Rust/C# languages on this side, Fast for the most part but also a bit verbose or explicit. On this ...
2
votes
4answers
551 views

Should every front-end developer understand the basic aspects of design?

I'd say that we're developing software in a world where the front-end of an application is probably the most important. The increasing ability for a user to access and interact with software almost ...
-2
votes
0answers
27 views

Should scraper interface with REST service, or directly with DB?

I'm interested in creating an application with a pretty simple architecture, but I'm newly attempting to make it modular and scalable (i.e. backend components as separate projects running in their own ...