A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner

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Objects in smalltalk and c++

I have a question based on SmallTalk and C++. In one of the programming languages books, there is a question like: "Does an object in Smalltalk require its own private stack? What about in C++?" ...
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1answer
44 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 ...
0
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2answers
458 views

Object inheritance and method parameters/return types - Please check my logic

I'm preparing for a test and doing practice questions, this one in particular I am unsure I did correctly: We are given a very simple UML diagram to demonstrate inheritance: I hope this is clear, it ...
0
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1answer
128 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 ...
1
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2answers
218 views

When should I refactor a private class into a package-private class?

When I began implementing a class in my system (let's call it A), I realized I needed some kind of object that does something. So I needed a new class (let's call it B), but I made it a private static ...
1
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2answers
116 views

Python: Object initialised inside a Class?

Is possible and, if so, common practice to initialize an object inside a class in Python? self.field = Class()
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1answer
213 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){ ...
2
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2answers
228 views

Inheritance in imperative programming

My first introduction to programming was Java, which was horrible so I learnt Actionscript3 which was nice... "The point is" OOP was my introduction to programming where by I went on to gain a career ...
4
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3answers
228 views

Reducing dependency cycles and reducing coupling

I'm trying to learn how to produce quality object-oriented code and have been studying concepts like SOLID. I'm currently working on an entity-component-process system for a small game engine. ...
3
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4answers
345 views

Understanding UML composition better

The difference between Composition and Aggregation in UML (and sometimes in programming too) is that with Composition, the lifetime of the objects composing the composite (e.g. an engine and a ...
0
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3answers
180 views

I want to understand clearly why can't we instantiate an object of an abstract class [duplicate]

Can I get a clear explanation why why can't we instantiate an object of an abstract class. I know abstract is not real. But I want to know more why can't we instantiate an object of an abstract class. ...
0
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3answers
99 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 ...
5
votes
1answer
2k views

Why is imperative programming preferred over functional programming? [closed]

Background: I am proponent of functional programming who works at a VB.NET shop where the prevailing mental model is imperative programming. Being that foundation of our system is WinForms I can ...
1
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1answer
192 views

Convert procedural code to object oriented

I have a PHP application (a web service). It consists of files grouped in directories by theme like :      /customer         /search.php with this example content : Auth::authenticate($options); ...
0
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3answers
198 views

Force Derived Class to Implement Static Method C#

So the situation is like, I have few classes, all of which have a standard CRUD methods but static. I want to create a base class which will be inherited so that it can force to implement this CRUD ...
3
votes
2answers
239 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
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1answer
78 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 ...
1
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1answer
142 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 ...
28
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8answers
6k views

When writing object-oriented code, should I always be following a design pattern?

Is there a conceivable design pattern for any object-oriented program? I ask this because recently I saw an implementation of a Door class with a Lock. It was part of a test and the answer said that ...
1
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1answer
65 views

Setting fields of a base class when using the constructor is not an option

I am refactoring a base class, implementations of which are plug-ins, loaded at runtime by another class using reflection. The class I am refactoring uses a user ID of the form domain\user. I need ...
2
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2answers
55 views

How to ORM non-disjoint specializations

Consider this highly simplified sample of relational data (each table may be involved in one-to-many and many-to-many relationships not shown here): people +-------+------+--------+ | name | born | ...
1
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1answer
131 views

Best OOP pattern to use for creating a commandline SQL API for a proprietary json based company datastore

We need to create a SQL commandline tool for querying a proprietary json based datastore. I'll be using java. Any suggestions on the primary OOP design pattern I should use for building this API? ...
3
votes
3answers
304 views

Should we add constructors to structs

We often use c++ structs to define data structure as opposed to class which can be a complete module with member methods. Now deep down, we know they both are the same (loosely speaking). The fact ...
2
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2answers
58 views

Domain/Model objects attributes good practices

Simple question: Should model/domain objects only include attributes that are meant to be persisted in a database or serialized to any other specific format? My understanding of a domain/model object ...
0
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0answers
39 views

Is this interpretation correct on usage of interface? [migrated]

We have numerous threads talking about the usage of interface vis-a-vis abstract class Taking reference of an answer, given by Prasun looks complete answer to me. Do you think this is complete ...
3
votes
2answers
105 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 ...
13
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10answers
2k views

Can objects constructed from the same class have unique method definitions?

I know this seems like a weird question, since the point of two or more objects sharing the same class is that their behavior is the same, i.e. their methods are identical. However, I'm curious if ...
2
votes
0answers
52 views

Advantages and drawbacks of different ways using Either-types

I am writing software for compiling programs. Therefore have a Compiler that compiles a given sourcecode. It then returns a CompileResult that is similiar to an Either type (it is actually internally ...
1
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1answer
243 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
1answer
310 views

Emulation of MMU accessing the contents of the registers

I'm having a play around with emulating a simple old CPU. I've set the structure up, so far anyway, as follows: The device is the main and creates an instance of the CPU. The CPU then creates ...
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votes
0answers
46 views

Adding a link label for a list of features [migrated]

I have a class that contains a list of features and I would like to add a link label for each item in that list. When doing this, I am not able to display all of the features, only the first feature. ...
1
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1answer
95 views

Should I use composition or inheritance for sharing configuration items?

I'm working on a fairly new project where I'd like to share some config items used by a JavaScript plugin. Specifically, the project is using jQuery dataTables and I want to find a good way of sharing ...
1
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2answers
65 views

Is composition and aggregation really a type of association relationship?

From Wikipedia: There are four different types of association: bi-directional, uni-directional, Aggregation (includes Composition aggregation) and Reflexive. From what I know: Composition ...
1
vote
2answers
689 views

Search and Replace in MVC

What would be a good MVC/OOP/GRASP/SOLID structure for a search/replace functionality. Methods: search/searchNext/replace/replaceAll. I'm interested only in the PHP arhitecture and how a professional ...
0
votes
3answers
114 views

OOP: relying on protected properties in a class-subclass contract

I'm coding in Python, but the question seems independent of programming language. I have a class that represents some system check: class Check: @abstractmethod def run() """ You have to ...
0
votes
1answer
68 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 ...
4
votes
2answers
911 views

How does MVC work with the principle “Tell, Don't ask”?

Procedural code gets information then makes decisions. Object-oriented code tells objects to do things. — Alec Sharp So, when a view wants to display some information that is suppose to be ...
-1
votes
1answer
33 views

How do Event Bus and ReativeX interact with each other?

I wanted to look into communication/decoupling patterns and how to improve them. My current approach is to have a centralized commander in the form of an Event Bus and make him be the one to respond ...
17
votes
8answers
16k views

What's the difference between “use case”, “User Story” and “Usage Scenario”?

Is there an exact, but simple and understandable defintion of the distinction between "use case", "User Story" and "Usage Scenario"? there are quite a bunch of explanation, but right now, I see no ...
-2
votes
1answer
71 views

Architecture - 3D Modeling Library

I'm writing a library to allow users to generate 3D models programatically. User writes code (e.g. Square(4)) User views preview of 3D model (with built in visualizer) User can "print" the model to ...
-2
votes
1answer
60 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 ...
20
votes
11answers
1k views

Does Refactoring towards Looser Coupling and Smaller Functions affect Speed of Code? (and should I care)

In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into ...
4
votes
2answers
617 views

What is the difference between Encapsulation and High cohesion?

I've looked at encapsulation and cohesion, but they look like the same thing to me. Isn't an encapsulated object already highly-cohesive?
0
votes
1answer
264 views

How to store an object state/data for later processing?

What do you think would be the most effective solution to maintain an object status through a life cycle? The goal to be able to be continue from any state any time. During the life cycle likely to ...
2
votes
1answer
158 views

Interface hierarchy design for separate domains

There are businesses and people. People could be liked and businesses could be commented on: class Like class Comment class Person implements iLikeTarget class Business implements iCommentTarget ...
1
vote
2answers
354 views

Generics in low level languages

I'm developing a language like Vala and OOC that compiles back to C. This means that, eventually, every feature needs to be adoptable to C code in some way or another. Generics is one of the features ...
3
votes
3answers
211 views

Interface to enumerate over files

I'm trying to design a generic interface for enumerating over a list files. Each iteration will open a file, allow the consuming code to access the file to perform some task, and then close the file. ...
1
vote
1answer
141 views

DataMapper for a MMO game plugin to send packets

I am working on an plugin for some game-server. The information about the plugin is not really necessary. Few points you might find helpful to answer to this question: The server The server is ...
25
votes
8answers
2k views

What is the real responsibility of a class?

I keep wondering if it is legitimate to use verbs that are based on nouns in OOP. I came across this brilliant article, though I still disagree with the point it makes. To explain the problem a bit ...
10
votes
3answers
2k views

Class Versus Struct

In C++ and other influenced languages there is a construct called Structure (struct), and another called the class. Both are capable of holding functions and variables. Some differences are: Class ...