Object-oriented design is the process of planning a system of interacting objects for the purpose of solving a software problem.

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Ignoring the generic part of a type while an object is being passed

I have a message class that holds the name of a destination, and a generic variable acting as the message payload public class Message<T> { public string Destination public T Payload ...
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4answers
242 views

Relative encapsulation design

Let's say I am doing a 2D application with the following design: There is the Level object that manages the world, and there are world objects which are entities inside the Level object. A world ...
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1answer
256 views

Interface questions for using Command Pattern and Dependency Injection together

I have many projects that have essentially the same high level requirement: test all hardware on a device. Each device can have a different communication protocol, requires different test equipment to ...
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1answer
162 views

Passing in config values to a method using SOLID principles

I have an email helper class that has a method that sends email: private static class EmailHelper { public static void SendEmail(string from, string to, string subject, string message) { ...
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1answer
73 views

Should this interpretation happen in the Controller or the Model?

Imagine an application where the user is allowed to create his/her own musical scales. The user selects notes from a list, arranges them to a group and presses a button to create the scale. In an MVC ...
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1answer
104 views

Design pattern for modifying state and notifying the other modifiers without a loop

The idea is that I have a set of properties that represent possible options in the app. These options can be modified through a variety of different ways, such as from the UI, remotely, third party, ...
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2answers
71 views

Class hierarchy question - do you implement separate classes for the same behavior? [on hold]

NOTE: The language I am using is C#. I am currently working on a 'The Quest' mingame where there is a player and some enemies. My design so far involves a base abstract class called 'Mover' and an ...
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2answers
160 views

Handling multiple packet types in Java 8

I have a Netty-based game server implementation that handles 40 or so distinct packets with their own serialization structure, for brevity I'll refer to them as FooPacket, BarPacket, ... These packet ...
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1answer
91 views

overriding implemented base class methods

I read somewhere that the chain of inheritance breaks when you alter a behavior from derived class. What does "altering a behavior" mean here? Is overriding an already implemented method in base class ...
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2answers
134 views

One boilerplate class or many similar classes?

Lets say I'm trying to model a variety of objects that are virtually identical, the only difference being their class variables. Am I better off creating one boilerplate class and just calling the ...
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0answers
55 views

“Resource center”: should the resources be exposed as public constants, or through getters?

I'm working on an application that has to do with music. Since the beginning of the work on the app, I had a public class named MusicalResources. The class had public static final Notes and Chords. ...
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2answers
1k views

Visitor stability vs instanceof flexibility

I am working on a GUI application which generates a configuration file. I have a class hierarchy for the configuration model and I use an object tree of that hierarchy in several different contexts. ...
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2answers
105 views

How do I recreate this Access Control/Group/ whatever methodology in OO/MVC

I am looking at trying to rewrite an application that is mostly procedural to an MVC/OO approach in order to teach myself a deeper understanding of both. BUT, I am having some conceptual issues with ...
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1answer
171 views

Updating an Entity through a Service

I'm separating my software into three main layers (maybe tiers would be a better term): Presentation ('Views') Business logic ('Services' and 'Repositories') Data access ('Entities' (e.g. ...
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2answers
83 views

Is DDD not appropriate for my website or should I introduce a Query Layer?

I have inherited an ASP.NET website application and the previous developer has used what I believe are some DDD concepts. I am new to DDD and I have to admit I am struggling with the practical side of ...
2
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3answers
179 views

Is 'design with types first' ultimately the same as 'design with interfaces first'?

In Object Oriented Programming, we're taught to think in terms of Polymorphism (the idea that the implementation is decoupled from the interface - and that it makes sense to think of the interface ...
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2answers
126 views

Separation of concerns between objects

I have two objects which work together to provide interaction with HIDs on a machine. One object is responsible for the communication (read/write) to the HID and the other object is responsible for ...
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1answer
273 views

Binary Tree/Knowledge Base design C++

Currently I have a binary tree template setup where my main is using it with strings to make a question/answer game. I'm using a knowledge base that works as an interface to the binary tree that main ...
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1answer
156 views

Basic PHP Object Oriented Design Review

I am attempting to learn object oriented programming by designing a simple web application related to the Catholic liturgical calendar. I have very little formalized training in programming, but I ...
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1answer
84 views

Is it better to put an event on the top object or closer to where it's local?

Take the following basic structured code for example: class Player { public QuestLog QuestLog { get; set; } } Let us consider that "QuestLog" has the ability to fire off some events when things ...
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1answer
49 views

The ViewController design in iOS vs MVC in tradiational web apps design

As I came from the background of webapps and move to iOS programming, I am wondering why we can't just apply the MVC design approach to native apps, i.e. in iOS, the view and controller are tightly ...
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1answer
224 views

Is my class structure good enough?

So I wanted to try out this challenge on reddit which is mostly about how you structure your data the best you can. I decided to challenge my C++ skills. Here's how I planned this. First, there's ...
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0answers
100 views

Why should ViewModel route actions to Controller when using the MVCVM pattern?

When reading examples across the Internet (including the MSDN reference) I have found that code examples are all doing the following type of thing: public class FooViewModel : BaseViewModel { ...
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6answers
494 views

Requesting feedback on my OO design

I'm working on an application that creates music by itself. I'm seeking feedback for my OO design so far. This question will focus on one part of the program. The application produces Tune objects, ...
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3answers
137 views

How to change the state of a singleton in runtime

Consider I am going to write a simple file based logger AppLogger to be used in my apps, ideally it should be a singleton so I can call it via public class AppLogger { public static String file = ...
35
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5answers
4k views

Passing functions into other functions as parameters, bad practice?

We've been in the process of changing how our AS3 application talks to our back end and we're in the process of implementing a REST system to replace our old one. Sadly the developer who started the ...
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11answers
2k views

When would you want two references to the same object?

In Java specifically, but likely in other languages as well: when would it be useful to have two references to the same object? Example: Dog a = new Dog(); Dob b = a; Is there a situation where ...
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1answer
167 views

Design for object with optional and modifiable attributtes?

I've been using the Builder pattern to create objects with a large number of attributes, where most of them are optional. But up until now, I've defined them as final, as recommended by Joshua Block ...
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21 views

SmartHeap crashes in _shi_removeFromFreeList [migrated]

We have a multithreaded application in C++ which uses SmartHeap-10 on Linux. new, new[], delete and delete [] are overloaded. there is inconsistent occurrence of SIGSEGV, only in delete[]. the ...
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1answer
174 views

Poltergeist and factories [closed]

I've just come across the Poltergeist anti-pattern - and maybe it's because the morning coffee hasn't kicked in yet, but I read the description: a poltergeist (or gypsy wagon) is a short-lived, ...
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1answer
115 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; ...
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2answers
193 views

Is this a poltergeist or is it justified? [closed]

I've come to a point in re-design of my code where I face an imminent Poltergeist Anti-Pattern threat. A master application object has two "eye" objects. Eye objects have a "RenderHUD" function, which ...
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6answers
6k views

What are the differences between abstract classes, interfaces, and when to use them

Recently I have started to wrap my head around OOP, and I am now to the point where the more I read about the differences between abstract classes and interfaces the more confused I become. So far, ...
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2answers
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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 ...
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1answer
196 views

Should we encapsulate everything in a try{} block in a Try object?

Why can't I make a class for a Try including what I try and then run that in the try {} block? Why is it impractical? class DBConnectTry extends Try { TryResponse response[] attempt(TryObject ...
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1answer
91 views

Domain model for a notification system

I'm trying to build a modular notification service in a ASP.NET MVC web application. The application generates notifications and the service is responsible for delivering the notifications to the ...
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5answers
184 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 ...
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3answers
165 views

Is it considered bad practice to make a DAO call in an object's constructor?

I am trying to figure out the best design for instantiating an object which requires two separate calls to the data layer through a DAO. The object is not usable until these calls have been made ...
3
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1answer
56 views

When to declare @throws with a Scala annotation - abstract parent or concrete implementation?

In this StackOverflow question I asked about the behavior of the @throws annotation in Scala. Now that I understand how it works I want to ask about best practices with using it. Here's a repost of my ...
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2answers
180 views

Describe business logic with diagrams

I am currently developing a web application for my thesis.I was asked by my professor to make diagrams to describe the business logic. Since I don't have a prior experience, I am pretty confused with ...
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82 views

What is a good way to structure my UI classes?

So, I have a program which has a swing GUI. (Java - duh!) I really, really don't think the way I'm structuring my classes now is good, so I am reorganizing from the ground up to follow best practices. ...
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1answer
49 views

Modeling Associations

I am working on the design phase of a paper folding project. I have a few queries in this. Part of the problem statement says " A web can contain one or more ribbons in it. It can also contain a ...
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1answer
64 views

Queue of jobs in a different states and with different services around

I need to design a 'queue' of jobs (in a a very much UI oriented application) that can be run by a user and I need some other thoughts to pick optimal approach from ground up. My jobs can be in a ...
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1answer
70 views

DDD with entities with no relations

Disclaimer: I'm not 100% sure I understand some of the practices and concepts in DDD, so this question may actually be answered by clarification of the ideas I'm working in a legacy system (written ...
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6answers
364 views

Object Design & Cohesion - Issue & potential refactoring

Abstract I have been trying to get my head around the cohesiveness of some functionality in our code base. I’ve approached this design in different ways, and lately I’m convinced that I took the ...
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2answers
118 views

Should an abstract class always abstract its methods to an interface?

I had learned sometime ago that abstract classes should always abstract their functions to an interface. So instead of having something like this - abstract class a{ public int i; public int ...
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3answers
473 views

Why not apply Interface Segregation Principle to “extreme”

Providing that clients would typically consume just one method, though methods would be conceptually related, why not always apply the Interface Segregation Principle to the extreme and have [many] ...
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0answers
27 views

Proper program design for submitting a form

I have been stuck wondering what the best solution to the problem below: I am developing a form like GUI with quite a few places for input. Currently, I am storing each UI element in an ArrayList ...
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3answers
408 views

Why shouldn't an object reference have access to a static member in C#

Context of my question: I am reading C#. Trying to understand Static keyword. I understand that when Static is applied to a member of a class, it can only be modified by the class and not the class ...
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9answers
4k views

Programming for future use of interfaces

I have a colleague sitting next to me who designed an interface like this: public interface IEventGetter { public List<FooType> getFooList(String fooName, Date start, Date end) ...