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

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4
votes
3answers
328 views

Inheritance vs containment while extending a large legacy project

I have got a legacy Java project with a lot of code. The code uses MVC pattern and is well structured and well written. It also has a lot of unit tests and it is still actively maintained (bug fixing, ...
0
votes
0answers
104 views

Architecture or Pattern for handling properties with custom setter/getter?

Current Situation: I'm doing a simple MVC site for keeping journals as a personal project. My concern is I'm trying to keep the interaction between the pages and the classes simplistic. Where I run ...
2
votes
1answer
158 views

How to fix poorly designed software? [closed]

I am working on large project solo as a hobby, and I made a mistake in the very beginning: I jumped right into programming without giving a second though to design. Now I am nearly 6 months in and ...
1
vote
0answers
46 views

Is using partial classes for supporting multiple versions of data entities for continuous delivery scenarios a bad idea?

When you want to have continuous delivery any data schemas that you have must support multiple versions of your application at the same time (as you may have multiple version deployed when new ...
3
votes
1answer
159 views

Does this Decorator implementation violate the Liskov Substitution Principle?

Please consider the following implementation of the Decorator design pattern: WordBank objects store strings and return them to the client through the method getWords(). The decorator class, ...
1
vote
3answers
105 views

Best way to find whether a collection does or does not contain an element with a specific desired quality

It seems to be a very common thing to have to tell whether some list or set contains at least one object matching a given condition, yet my prior searching and reading have never found a satisfactory ...
0
votes
0answers
36 views

automated acceptance testing / BDD & workflow for designing a system

Recently, I started reading the book Specification by Example, which relates to automated functional testing and BDD (from what I've understood till now). I've tried using Concordion (.Net), and ...
5
votes
0answers
77 views

How significant is the impact of the type system (static/dynamic) on the overall design of programs? [duplicate]

Coming from Java, I've never used a language with dynamic typing. I'm very used to the static-typing way of thinking. My question is, how much does the use of dynamic typing as opposed to static ...
12
votes
8answers
2k views

Conception and design before coding: how much is this true? [closed]

I learned at school as well as I read everywhere else that a good development methodology needs conception and design before coding properly. That is not a new information even for a beginner ...
0
votes
0answers
27 views

method of validating sanity of order dependent values received asynchronously

I have a series of hardware devices that I'm connecting to create paths through. I have some sanity checking to make sure if potential paths are valid and will do what is intended, but to do it ...
2
votes
0answers
120 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 ...
0
votes
2answers
115 views

MVC pattern synchronisation

I am facing a problem in synchronizing my model and view threads I have a view which is table. In it, user can select a few rows. I update the view as soon as the user clicks on any row since I don't ...
8
votes
3answers
340 views

Designing unit tests for a stateful system

Background Test Driven Development was popularized after I already finished school and in the industry. I am trying to learn it, but some major things still escape me. TDD proponents say lots of ...
63
votes
7answers
9k views

Should I follow the normal path or fail early?

From the Code Complete book comes the following quote: "Put the normal case after the if rather than after the else" Which means that exceptions/deviations from the standard path should be put ...
-4
votes
1answer
168 views

Mock Objects: Real Issues, Test Driven Design with Java [on hold]

I'm trying to create a mock class to check the operability of a 'Searcher object', the object I want to mock looks like this: public class Searcher implements AristotelianSearcher { protected ...
2
votes
1answer
204 views

How to design the relation between a Game and a Player in a game?

I am currently attempting to make a Trading Card Game and I have got a whole array of features working already, yet I am stuck now at the portion where one player can attacker another player (more ...
5
votes
2answers
946 views

Should I feel “uncomfortable” using auto in C++? [duplicate]

C++11 features the new auto type declaration, allowing you to work with an object without ever knowing its actual type. I use only strongly typed languages - C++, Delphi (Object Pascal), Go, etc and ...
2
votes
1answer
129 views

Website as an API client vs using the API only when needed?

I'm developing a website (using Django) which will depend on an API for it's main functionality which is create/update/delete objects. But the API also provides: User sign up and login User ...
2
votes
1answer
69 views

How to handle errors best addressed in a higher abstraction layer and dependent on state inferred in current layer?

I have a use-case that can be repaired, but the logic for repairing it is best done in a higher level of abstraction. Just throwing exception/failure is ugly because it's hard to pass back up through ...
0
votes
1answer
85 views

How to employ amatuer knowledge of software architecture and design in an agile manner? [closed]

I have a problem when designing any application that is either greenfield or a refactored brownfield due to often finding a potential flaw or an uncertainty with the design or architecture that I ...
0
votes
1answer
183 views

pattern to share objects between API and application

I'm having serious doubts about the design for my Web application. I wanted to separate the business logic from the interface so I made a Web API that handles all the requests to the database. It's ...
2
votes
1answer
137 views

Adapter Pattern: Design Patterns

So far as I know, there are two forms of the Adapter Pattern: the class adapter and the object adapter. Could someone please explain to me the following limitation of the class adapter and why it is ...
0
votes
0answers
30 views

Organizing an image processing pipeline for on-the-fly video analysis

I'm trying to design a system that performs image analysis on video streams from the internet. I have a few rudimentary ideas for how to organize such a system, and I was hoping you guys could ...
5
votes
1answer
146 views

Strategies to manage multiple clients able to simultaneously edit same data

How can I deal with situations when multiple clients might edit same object at the same time? For example, I have a web app with admin console, which lets you edit profile data. Several users want to ...
1
vote
1answer
90 views

Collaboration between a Graphic Designer and Expression Blend developer? [closed]

I'm new to the programming world and also a little bit confused. My brother would like to work with me on some program. I'm a graphic designer so he asked me for UI and all it's elements. I would ...
4
votes
1answer
93 views

Merging around 15 small Git repos of non-optional centralized web service components to a single large repo

In a centralized web service we break down the components into various small Git repos by software modules, e.g. authentication module, authorization module, data access module etc. (around 15 repos ...
2
votes
2answers
961 views

AngularJS: structuring a web application with multiple ng-apps

The blogosphere has a number of articles on the topic of AngularJS app structuring guidelines such as these (and others): http://www.johnpapa.net/angular-app-structuring-guidelines/ ...
3
votes
1answer
79 views

Access items of a container with a pattern

I've two C++ classes with a relation: a container class which has a list of items. For example a library has got many books. The classes are the library and the book. Now from the external world I ...
0
votes
1answer
33 views

Logging system interactions as a user vs as a flag

When running a site that has a CRM with a logging facility that logs users interactions (someone changing a name, address or user permission etc), is it better to log system interactions (automated ...
1
vote
1answer
112 views

From a DDD perspective is a report generating service a domain service or an infrastructure service?

Let assume we have the following service whose responsibility is to generate Excel reports: class ExcelReportService{ public String generateReport(String fileFormatFilePath, ResultSet data){ ...
6
votes
3answers
283 views

How to adhere to the open-closed principle in practice

I understand the intent of the open-closed principle. It's meant to reduce the risk of breaking something that already works while modifying it, by telling you to try to extend without modifying. ...
1
vote
4answers
514 views

Can recursion be done in parallel? Would that make sense?

Say, I am using a simple recursive algo for fibonacci , which would be executed as: fib(5) -> fib(4)+fib(3) | | fib(3)+fib(2)| fib(2)+fib(1) and so on ...
1
vote
1answer
78 views

Using a list of tuples vs a list of custom objects

I have a situation where I have several text documents and I want to create a list that contains the words in those documents. But I also need to record several properties of each word. These ...
2
votes
0answers
43 views

How deep is enough to represent an algorithm in UML sequence diagram?

I have three simple classes. LoginController, UsersCatalog and User. UsersCatalog has an array of User. I have to represent a simple process of login. LoginController has a method login(username, ...
1
vote
2answers
133 views

Should methods returning a hashmap of string to object be avoided?

In my current code I have felt the desire multuple times to have helper methods that generate a collection of objects and return them as a map of string to object, with the string being some unique id ...
2
votes
2answers
210 views

What do I gain by using the Strategy pattern in this case?

I wrote a program with Java that plays simple music. Currently chords have only one way ('strumming pattern') to be played. I want to expand this and create different 'strumming patterns' that chords ...
0
votes
1answer
77 views

MVC: Where should I store interchangeable algorithms used by the Model (whose names also need to be accessible to the View)?

Please consider a program, where the user chooses an algorithm from a list, and the Strategy pattern is utilized to set this algorithm as the model's operation. For example, an image procession ...
0
votes
1answer
96 views

Unit-based architecture

This is probably a damn fool question, for which I apologise, but I can't seem to get the google syntax right to find an answer. Imagine a Property, like this: private int _type public int Type { ...
6
votes
2answers
442 views

MVC: my controller seems useless half of the time. Is this a problem?

Often when I design a program with MVC, the controller is useless half of the time. What I mean is this: something happens on the view (e.g. a button click). The view then notifies the controller. ...
4
votes
2answers
141 views

Refactoring a live system that is tightly coupled with improper data models and business logic in the front-end

Scenario This was a project that I once had to maintain. After reading Working Effectively with Legacy Code, I started to think how I would refactor this system in a live environment, if I had to ...
0
votes
2answers
162 views

Is often using int constants as parameters in communication between objects considered bad design?

An app I'm working on is designed with MVC. The components often interacts with each other by passing int constants, which then have to be interpreted with if statements. I'm wondering if this is ...
0
votes
2answers
79 views

Controller and Model Interaction

I'm fairly new to MVC and I'm trying to get a better understanding of it. There is endless information about the theory and general responsibilities of each part of an MVC app, which I've read a good ...
1
vote
1answer
28 views

Embedding XACML PDP?

I need to implement a flexible Access Control system for a framework used by a couple of .NET applications. I have looked into Attribute-Based Access Control (ABAC) and XACML and this seems to ...
0
votes
0answers
40 views

How to implement 'use case control' object in (iOS) MVC?

In an MVC architecture pattern (for e.g., in iOS) there is a controller per view. In UML there is a concept of having Control object per use case to encapsulate an use case, which may span more than ...
4
votes
4answers
403 views

MVC: Does the Controller break the Single Responsibility Principle?

The Single Responsibility Principle states that "a class should have one reason the change". In the MVC pattern, the Controller's job is to mediate between the View and the Model. It offers an ...
2
votes
2answers
116 views

MVC: Controller often simply delegates to Model when notified by View of GUI events. Is this reasonable?

Since I learnt about MVC, I used it for every app I made (which is arguably not the best idea, but that's not the topic of this question). All of them small, 1000 LoC apps. I am using Java and Swing ...
1
vote
2answers
88 views

Are the following Use Case Levels determined correctly?

I am confused about use case levels. All I could understand was that use cases that are contained in another use case fall under the level which is below the level of the container use case. I have ...
1
vote
1answer
170 views

Practical programming according to the Dependency Inversion Principle

What the Dependency Inversion Priciple implies in practice is that in a system, high level components should depend on abstractions of the low level components (instead of on the low level components ...
0
votes
3answers
82 views

Should I use an Exception in a case like this? [duplicate]

I have a Windows service with a fluent interface like this: aRequest = Repository.getRequest() .createProcess() .validate(); Sometimes getRequest() could ...
5
votes
1answer
311 views

Design review: how well does my object oriented design fit the SOLID principles? [closed]

This thread will be long, but I will try to make it as short as I can. Thank you. I have recently implemented a relatively simple program. What this program does is generate a simple piece of music ...