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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Choosing class names and relations for different user scopes

I am developing an online Order Management System using PHP in which I have some different behavioural scopes regarding the User class: some user scope under which the chronological transactions are ...
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2answers
116 views

Is an empty class in some cases correct

I know it's generally a design flaw to have an empty class, yet I'm wondering whether there are some cases where it isn't to have an empty (abstract) class to group objects. Especially when ...
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155 views

Should I force “composition over inheritance” rule to class members?

As I know, according to "composition over inheritance" rule, we should avoid reuse a method by inheritance, but how about class members? Suppose I have parent and child classes: public class Animal{ ...
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2answers
84 views

How to remove circular reference when there is inter-dependence

I made an extensive research in previousv related questions, but since my questions is somewhat peculiar, I decided to create this new one. I am implementing a visualisation application (in JS). ...
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1answer
94 views

Writing a non-monolithic database wrapper

I have a SQL database to which I store and from which I read several objects into my C++ code. I wrote a single database wrapper which handles all the reads and writes to the DB. Of course this ...
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3answers
162 views

Role and importance of static method in OOP

Background Thinking about OOP I feel that it binds data and behavior together, taking the real world example we already have array data type which is a collection of homogeneous type but in Java we ...
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1answer
49 views

UML: do I use aggregation or composition in this case?

I would like to draw a UML sketch to communicate part of a software but the type of relationship between classes does not seem very clear cut to me. Let's say I want to periodically fetch the recent ...
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52 views

What would approach to solve this Design problem [closed]

In Pond there are different types of creatures like fish ,frog and platic fish. We need to implement walk,swim and sleep functionality. I have implemented below. Would it valid approach or do we have ...
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1answer
158 views

is this a good design

For example, I have a clan and a character. There's a character that is the leader. To give the clan a specific feature, some money from the character is required. I don't want to have too much tight ...
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3answers
171 views

optional data in the constructor, bad practice?

Currently I have a model class that represents a user. This class has a constructor that takes an object with all user properties, used for example, when creating the user. In this case I instantiate ...
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1answer
76 views

Example of class modeling

This is in the continuation of Small classes and methods, but code still difficult to maintain and follow as I have matured the problem and will rebound on people's answers. Here are all the elements ...
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3answers
148 views

Verbose Return Types

I've recently been writing some code that deals with 3rd parties -- obviously errors will happen so I'm using Either/Maybe monads where appropriate. As this is C# I'm also using async Tasks too. My ...
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1answer
75 views

Polymorphic constants in Java

I am designing some polymorphic code to perform mathematical operations. The idea is to abstract out the underlying representation of the data, as different use cases require different representations....
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1answer
38 views

Expose one whole object or several properties of that object?

I'm currently refactoring on an older project, which has classes that expose both a single object and also multiple properties from that object. Ex: public class Foo { private MyObj myObj; ...
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6answers
320 views

Mutability and getters

In the example below, I have a Person class and class B that holds a reference to a Person. Person has a public foo1 method that can alter its state (it's a mutable object). Suppose clients of class ...
2
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1answer
73 views

What design pattern(.Net) to use for multiple control design with multiple properties?

I have to design for a bunch of user control types, each of which share some common properties but some of which have special unique properties. For example, the common properties across all the ...
4
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7answers
494 views

Should I use static classes for methods that will do common tasks and would be called through out my application?

I have spent the last few hours reading up on the use of static classes and trying to figure out if I should be using them or not but still have not come to any sort of conclusion. It seems that the ...
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2answers
193 views

Design pattern for managing three different objects

I´m looking for the best way to solve following problem: I have three lists of different objects: AppleJuice, OrangeJuice & Juice. All Juice properties exists in AppleJuice & OrangeJuice ...
5
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1answer
112 views

Inheritance from children to parents?

Seeing this UML class diagram : FileHandler, Uploader and Deleter are abstract classes. The four bottom classes are implementations. They extend on FileHandlerInterface which requires a handle ...
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3answers
115 views

Passing a private member collection to another class

Suppose I have a Map which is a private member variable of my class A. In the same class I create an instance of class B, call it objB, by passing the map to B's constructor. Obviously this is ...
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1answer
104 views

Is there a good way to use the front controller pattern for command line applications?

I am a PHP developer and I used to build web applications with one PHP file per page for a very long time. This resulted in duplicated logic and messy code (even though I didn't know it at the time). ...
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3answers
109 views

Cyclic dependency in this project design

I have 2 modules (containing multiple classes). Let's call them Module A and Module B. Module B has a dependency on Module A: Module B -> Module A. Now, I have created an utility class C, which A ...
4
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2answers
106 views

Is there an elegant way to check unique contraints on domain object attributes without moving business logic into service layer?

I have been adapting domain-driven design for about 8 years now and even after all these years, there is still one thing, that has been bugging me. That is checking for a unique record in data storage ...
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42 views

Modeling a cookbook recipe with django

I'm trying to model recipes in a cookbook. Here's what I have so far: class Recipe(models.Model): title = models.CharField(max_length=255) class Ingredient(models.Model): class Meta: ...
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2answers
186 views

How to avoid circular reference in OOP Javascript?

I have a problem while working with entity framework in JavaScript. I have two classes Table and Column Class Table { Columns: Column[] } Class Column { Parent: Table } Everything works fine until ...
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1answer
218 views

Name for this design pattern?

Background Working as a software engineer in the field of electronics, I often find that none of the existing design patterns i.e. GoF typically fit the bill for what I need to do. One of the ...
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2answers
129 views

Recreating complex aggregates from a persistance source

I'm building a web application with C#, and I have an aggregate root which has several entities and value objects. Then I have a repository object which persists the aggregate to the database (I'm ...
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48 views

GUI - engine data exchange, design with C, getters or struct pointers passing?

Having quite big codebase and external libraries, in C application, what would be pros and cons of two approaches (or suggest other): (assume that there are NONE api provided calls for this) Edit ...
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83 views

Architecture design for Web API with single endpoint

Scenario: I have a situation where I need to refactor a Web service with a single API endpoint that uses complex logic to insert, update and fetch data from a database. The clients use one call, and ...
6
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2answers
221 views

Is the command design pattern a good way to reduce the number of dependencies in my class?

I recently realized that I have way too many dependencies in many of my classes. Now I am trying to solve that for the most important class. I think I have an idea how but I'm not sure if it is the ...
7
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3answers
243 views

Using Interfaces for Loosely Coupled Code

Background I have a project that depends on the usage of a certain type of hardware device, while it doesn't really matter who makes that hardware device as long as it does what I need it to do. With ...
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1answer
108 views

Should I actually be using encapsulation here?

Problem Statement I am going to write a library to control a whole bunch of relays, and I am just trying to think conceptually right now. Here are my design constraints: We have an exact number of ...
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4answers
280 views

Should every class I write adhere to an interface?

I'm writing a game in Typescript, and decided going in that I was going to try to adhere to the idea of "interface based programming", where you write code based on an interface, instead of the ...
2
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2answers
129 views

Sharing POJO between different handlers

I am trying to automate Business Process which can be characterized as a pipeline with distinct stages. Pipeline can be perceived as A->B->C, where A,B,C are distinct Business Steps that work ...
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103 views

What are the benefits of an input/output component design?

For the company I work at, all of our projects, including a new one started last year, are written in C89. We write for vxWorks (a real time embedded operation system). Our software runs multi-...
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1answer
115 views

What kind of data structure should be used to store components in an electrical schematic program?

Is there a specific data structure, object oriented programming methodology, and/or approach for achieving what programs like LT Spice, Altium Designer, and Cadence Virtuoso use to manage components/...
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112 views

How to authentication user in REST API (domain driven design)

I am using REST API as a presentation layer of a DDD project. In order to secure API calls I am using token based security. http://www.codeproject.com/Articles/1005485/RESTful-Day-sharp-Security-in-...
2
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3answers
138 views

Command Pattern - Correct usage?

I have a scenario wherein I need to do certain specific steps in a specific order. For clarity lets take a simple example. Let's say I have a Student and some Student Properties which I encapsulate ...
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30 views

What is the difference… no, relationship… between coupling and cohesion in OOP? [duplicate]

What is the relationship between coupling and cohesion in OOP? I am especially thinking of how these concepts apply specifically in a multi-tiered/multi-layered project. I find that my applications (...
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3answers
215 views

Is it ever appropriate to use subtyping for a has-a relationship?

One of the basic precepts of object oriented programming is that subtyping represents the "is-a" relationship. That is, the child is always a specific form of the parent. A common example is that a ...
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3answers
100 views

How to clearly define boundaries of a bounded context

After a month or so of reading and researching DDD, I decided to start my own project and created DDD with these bounded contexts> Clients Products Orders Billing Each bounded context has rest API ...
3
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1answer
163 views

Checking preconditions the proper way

I have a class with around 1300 lines and it has many CRUD-like methods that need parameters to be checked, for some of them it's more than just a few rules. For clarity purposes, I am going to use ...
3
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1answer
224 views

How to pass data to OOP objects?

I'm new to this whole thing, so please tell me if I'm doing this wrong of if there's a better spot for my question. I'm making a game with basic systems for projectiles, npcs and items. This game ...
2
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2answers
190 views

Law of Demeter and its applicability

Let's say I'd like to perform the following command: house.getFloor(0).getWall(WEST).getDoor().getDoorknob(); To avoid a NullPointerException, I'd have to do the following if: if (house != ...
2
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2answers
139 views

Best way to enforce constraints in Class

I have a class, something like this one (C#): public class MyFavoriteClass { public string Name { get; set; } public string Description { get; set; } (...) public ReferencedClass1 ...
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2answers
174 views

How to resolve LSP violation based on minimum precondition

I have a class Party that has a constructor that takes a Collection<Foo>. I plan to have two subclasses NpcParty and PlayerParty. All Party instances have an upper limit on the size of the input ...
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1answer
43 views

algorithm to convert technical specification into object model [closed]

I have detailed specification of what should my program take as input, and give as output. How to convert this specification into classes/methods/properties? I used such algorithm: Take ...
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2answers
105 views

Do you say “this” on protected members? [closed]

Background I have never had a formal class in OOP/OOD although I understand how the protected members work. Being accessible by any instance/derived class, they are thereby less private (more ...
5
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3answers
185 views

Should unit tests always overlap

This is a test design question. I have a class 'handler' that accepts a 'validator' that checks some business logic on what's passed to the handler. I made the unit tests for the validator and now I'...