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

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1
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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
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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
315 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 ...
1
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3answers
407 views

Web Application that is independent of web server software

Scenario I haven't faced this requirement before, so I'm not confident with my solution. Our team drew up a plan to design a web application using a basic HAT stack for a project with a 4 month ...
0
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1answer
112 views

Is it better to pass the whole object or use a setter?

Here is my initial code that I would like to modify by using strategy design pattern. class Bar { int a; int b; ... } Class Foo { Bar *bar; bool action1(){ // this function does a ...
-2
votes
2answers
176 views

Implementing a basic interpreter - should I learn regular expressions? [closed]

For fun and for practice, I'm thinking of maybe implementing a very basic programming language to run on a simple interpreter written in Java. My question is this: Is it a 'must' to know regular ...
1
vote
4answers
505 views

Is it considered 'reasonable' to implement a major part of a program largely by subclassing a library class? [closed]

I'm planning to implement a word processor using Java, and Swing for the GUI. I was thinking how I can implement the text area where the user types the text. My idea was to subclass JTextArea. It ...
0
votes
1answer
144 views

UML class diagram - instantiation dependency relationship: who depends on who? [duplicate]

I did some reading on the <<instantiate>> relationship in UML class diagrams. It's a dependency relationship where one side depends on the other. However, I'm not sure who depends on who: ...
1
vote
4answers
285 views

Why do browsers these days ship with dev tools [closed]

I just read a question asking how Facebook blocks console-based script attacks. The reason for this block was to prevent a recently famous "hack" where one would trick a user to inject a malicious ...
13
votes
3answers
649 views

Why are interfaces more helpful than superclasses in achieving loose coupling?

(For the purpose of this question, when I say 'interface' I mean the language construct interface, and not an 'interface' in the other sense of the word, i.e. the public methods a class offers the ...
2
votes
4answers
198 views

Managing client-side and server-side validations in one place

I'm 100% on board with the case that one should definitely use both client-side and server-side data validations. However, in the frameworks and environments I've worked in, the approaches I've seen ...
0
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3answers
152 views

New and old technologies coexist in legacy system [closed]

New technologies can accomplish existing tasks in more efficient and powerful way. But sometimes old technologies cannot be discarded unfortunately, so more numbers of technologies in one system make ...
3
votes
2answers
389 views

Aren't decorators easily breaking the ISP?

"The Interface-Segregation Principle (ISP) states that no client should be forced to depend on methods it does not use." The decorator pattern is a design pattern to decorate a method of a class. For ...
2
votes
2answers
198 views

How to provide a service with RESTful API?

Generally speaking, RESTful API's are very good for representing resources and collections of resources. http://example.com/resources http://example.com/resources/item17 And we are good, if we ...
20
votes
6answers
3k views

What is the role of the lead developer in an agile team?

In a non-agile development team a lead developer generally: Sets the standard (coding and otherwise) Researches new technologies for the team Sets the technical direction for the team Has the final ...
0
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1answer
82 views

Ensuring non conflicting components in a modular system

So lets say we are creating a simple "modular system" framework. The bare bones might be the user management. But we want things like the Page Manager, the Blog, the Image Gallery to all be ...
0
votes
3answers
167 views

Design and relationship of a cursor and its referred object

I need to implement a Cursor class to perform operations on a Document object, which is implemented internally as a simple list of rows. The Cursor class must have methods such as moving around the ...
1
vote
1answer
135 views

How to implement an algorithm out-of-core?

I want to implement a parallel clustering algorithm "out-of-core" in CUDA. My CPU has 12GB of RAM and GPU has 4GB of it. What I want is that the entire dataset should be on the disk, and I can pick ...
1
vote
1answer
120 views

Advantages and disadvantages of making one DB per customer [duplicate]

I'm starting to design a web application, and I'm evaluating some decisions regarding the general structure of it. My use case is as follows: I plan to have multiple customers on a single server. ...
0
votes
3answers
133 views

What goes within the Architecture Overview of a Design Specification?

I have designed an management system for a medical practice and I am writing the design specification and I am kind of stumped by what to write for a section. It asks for me to write about the ...
0
votes
2answers
91 views

Multi-Branch Retail System,how to control items quantity for various branches? [closed]

Currently I am developing Multi-Branch Retail software. All branches have the same set of items. However, each one has its own stock quantity. My question is, what is the best practice to apply in ...
2
votes
2answers
165 views

MVC: “User” model gets big and crowded. Should methods that do CRUD operations on one-to-many relationship data be in different models?

In most MVC web projects there is a User class. Many times a user has something else in a one-to-many relationship, i.e. orders. If we have a user class that has many orders, should methods that add, ...
3
votes
1answer
103 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 ...
0
votes
4answers
324 views

How to design an IDisposable that unconditionally needs to be disposed?

Consider a class that implements IDisposable, and that has members in such a way that it will never become eligible for garbage collection when it is not disposed. And as it will not be garbage ...
0
votes
1answer
90 views

Performance of One API vs Multiple API's

I was having a conversation with a colleague and although my opinion makes sense to me, I wasn't able to back it up. I'm in the process of creating an API that will be hit hundreds of thousands of ...
0
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0answers
40 views

Sproc chaining verse discrete calls from OO code

I'm currently working on a change at work to generalize a function that was sloppily coded up to work for a particular use case. The function calls a particular sproc that checks if an entity exists ...
0
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2answers
213 views

Can this argument be enough?

We have two C++ classes named Important and Small The class Small use a few methods and attributes from the class Important, but not all. Since our application is performance critical, instead of ...
2
votes
1answer
213 views

Inventory Management System Design Problem “Items Packages”

I am developing a retail management system with inventory management module, I am facing a logic design problem and I don't really know how to address the problem in an easy way, so I wrote an example ...
3
votes
1answer
190 views

OO design choice and single responsibility principle

I'm currently refactoring an application which periodically downloads content from various sources (http, ftp, sql, etc). There is a schedule which controls the times during which the application can ...
0
votes
0answers
54 views

Suggestion to Design API Centric Application using Appengine

I have been planning to create an new application. So I was designing the application structure.i know this application will be accessed form multiple devices and the app feature will be increased. ...
1
vote
2answers
194 views

Using the Decorator pattern to add public methods to an object

The Decorator pattern is usually used to extend the functionality of an object by extending one of it's current methods. To illustrate, please consider an object object and a decorator decorator. ...
0
votes
0answers
25 views

Communication between resource and authorization server/identity manager?

Short Doing the design / for an api we're building we noticed there is little to nothing to be found on how your resource server can validate a token given by a client with the ...
0
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1answer
137 views

Singleton: Why is a global point of access bad? [duplicate]

Most people here and on StackOverflow agree that Singletons are evil. The main explanation I've come across against the use of Singletons, is they fact that they provide a global point of access to ...
2
votes
2answers
131 views

Refactoring sought for replacing shared data types in .NET component

I am in charge with updating a software product that is made up of two components the Controller process and the UI process. The Controller and the UI communicate via XML messages. Furthermore, the ...
0
votes
1answer
47 views

Automating form error handling

I'm not sure if I'm being clever or making things more difficult. I'm working within a custom MVC framework, and within some of my "views" which contain forms I'm preserving input and styling errors ...
1
vote
4answers
311 views

Wrapper around C++ STL

Where I work we have our own system library, which pretty much is only wrappers around the STL, such as: template <typename T> class HVector { protected: std::vector<T> data; public: ...
2
votes
4answers
224 views

Should refactoring be the exception or the rule? [closed]

I had a discussion with a co-worker yesterday about design philosophy. The other coder is more experienced then me, and I fully admit that he is likely much better at properly automating his testing, ...
-3
votes
1answer
65 views

For professional designing company, what is the key to design an app elegantly? [closed]

I am coding and found it's pretty hard to come up with an elegant design for my app at the first attempt. First time I'm only about 40% happy, then I refactor it to code the same app a second time ...
0
votes
0answers
45 views

Is having coupled hosting in one platform better than having decoupled hosting?

Recently I have been thinking of converting some ideas into apps with couple of like minded friends. Our app will have an module, where users must include an instant messaging. The requirement for ...
0
votes
0answers
50 views

How to store progress of abstract events?

I making a game in node.js. I have players and they can perform a lot of actions. Actions are all coded as functions, and they change certain variables in either User object or other objects that ...
2
votes
3answers
196 views

Best Practices - separation of concerns and inheritance issues

Here's the situation: I have a "common" Data Access assembly that contains classes used in all my projects. Some of those are abstract classes that are only implemented by my data access layers for ...
0
votes
1answer
144 views

MVC in a desktop application - can the View ever hold a reference to the Model?

(I'm specifying this is a desktop application so people wouldn't refer specifically to web implementations of MVC). The title says it all pretty much. In an MVC structure - can the View ever hold a ...
7
votes
2answers
314 views

Dependency Inversion Principle: Understanding how both low level components and high level components depend on abstractions

I'm learning about the Dependency Inversion Principle. It states that: High level modules should not depend upon low-level modules. Both should depend upon abstractions. For a while I tried to ...
1
vote
1answer
134 views

Differentiating between Factory Method and Abstract Factory

I've been confused for a while about the differences between the patterns Factory Method and Abstract Factory. Been doing a lot of research, still confused. I have one question: Is the only ...
3
votes
1answer
92 views

What is the benefit of offloading email to a transactional mail service?

Why do so many people recommend offloading email to a transactional service such as Mandrill, Postmark or Sendgrid? Is sending email via smtp really that much slower than sending a request out to ...
0
votes
2answers
76 views

Container/Item pattern without `friend`

I have a class Container containing objects of type Item. They are different classes, and especially they have no common base class (e.g. a Container does not itself have a Container).: class ...
4
votes
1answer
242 views

If TDD is design, how do you know your TDD is well designed? [duplicate]

Given a large group (50+) of programmers: All given the same problem, All using Test-Driven Development (TDD), All pair programming, All doing group-based code review, I have personally seen the ...
5
votes
3answers
416 views

Dependency Inversion Principle vs “Program to an interface, not an implementation”

I'm trying to understand how the Dependency Inversion Principle differs from the "program to an interface, not an implementation" principle. I understand what "Program to an interface, not an ...
0
votes
1answer
179 views

Observer pattern: “Web of observers” - Is this ever in use?

I had an idea (which I'm sure already exists), to create a sort of 'network of observers/subjects'. I would like to describe how it works and than ask several questions about it. Say we have 5 ...