Questions tagged [object-oriented]

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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Intuitive dependency management with code includes?

I am building a PHP CMS system that parses template files and replaces tags with content. Sometimes this content is a HTML, CSS or JS snippet, but it can also be a code include. Most code includes ...
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1answer
617 views

Persistent Model to Domain Model mapping without exposing domain object's attributes

I know this is a common question, but I haven't found another that solves my doubts. Usually, if the project is small, I've persistence annotations in the same object that represents the domain ...
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437 views

Design a Windows Service with self-hosted ASP.NET Core Web Services and UPD port listeners

I'm designing a software platform in automation that is responsible of many different tasks like: Core functions Driver interface for machines UDP listener for machine messages from PLC UDP listener ...
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93 views

What's the use of interfaces vs classes in typescript?

In the company in which I work, it is customary to model entities using Interfaces when developing with Typescript. To me, it seems much more effective to model entities with classes and then ...
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1answer
724 views

Separate business logic from ORM models in SQLAlchemy

I have a Flask application with tens of complex models, almost all of them related to each other. A simple pseudo-schema of some of them: +----------------+ | FoodGroup | +-------+--------+ ...
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80 views

Creating bindable input handler in C++ spanning two separate modules

I have a wxWidgets application. This is the first, main module. The second module is an openGL engine. It's a model-view-(controller) structure, where application is the view (and the controller), ...
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75 views

Memento and releasing resources

Let's suppose we have a class whose state has to be saved and later restored, and we resorted to the Memento pattern for that. What if the state includes resources that have to be explicitly ...
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121 views

Ripple Effect Analysis using coupling metrics

How can I observe ripple effect using coupling attributes alone? I first find the common coupling metrics for a set of deprecated classes in a project, like CBO(Coupling Between Objects), RFC(...
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509 views

Dependency injection - Nested objects

# Introduction I am working on a CMS application in PHP with about 200 classes. The CMS, in general, does the same thing every CMS does: generate sites. I am learning a lot about OOP and design ...
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848 views

Reading and saving big data to db

I have a method for reading data from file. The problem is how to handle files that are too big for a simple read and save to database? I was thinking about reading a chunk of it and saving it to ...
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203 views

Is Nested Structure with Spread Responsibilities Not Logical?

Given the following code snippet in a Laravel Controller: $this->userRepository->saveByProject( $this->fileRepository->saveByProject( $this->metricRepository->...
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378 views

JS closures - Passing a function to a child, how should the shared object be accessed

I have a design and am wondering what the appropriate way to access variables is. I'll demonstrate with this example since I can't seem to describe it better than the title. Term is an object ...
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71 views

How to design software driver for the analog to digital converter?

I have been developing software driver for the analog to digital converter in C++. The a/d converter is primary intended for conversion of the temperature signals. The temperature signals are then ...
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316 views

Extensible / Plugin Architecture in Python - overwriting methods deep in the inheritance tree?

Current situation I'm developing a test-framework in python for end-to-end tests for a large ERP application. The AUT (application under test = ERP system) is structured in modules and provides a lot ...
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1answer
151 views

Dynamic Object Abilities When Saving State

I have n classes that extends from a State class, the purpose of the State class is to manage the state of the extended classes. For each class we need to save it in the database, remove it and select ...
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0answers
352 views

PHP OOP best practice to split low level class into two

What i got now is low level object that has bunch of methods and its difficult to navigate trough i want to break it down, however functions logically have same functionality just different ...
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45 views

Component needs to invoke class methods and instance methods (via ORM), how to structure

An interesting design choice/discussion has cropped up in code review, and I would like to understand more about proposed solutions. The original review includes re-factoring of a messy piece of code ...
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0answers
83 views

Modelling network and persistent entity representations

I have an app where I need to synchronize some entities (simply download latest versions of entities from server to client). Entity has bunch of text properties and bunch of resource links (referenced ...
2
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1answer
1k views

Where to store formulas and formula “constants”?

I want to implement a database driven payroll system using CSharp. I already did it once, but the implementation sucks so I want to do it again and do it right. My first thought is to create a static ...
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1answer
61 views

Inheriting DBModels and UI Models from Domain Models

I made a pretty simple CRUD API to store customers and some related information in a database. My customer has 20 properties like Name, Telephone etc. that are all stored in an anemic domain model. My ...
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2answers
118 views

Collect Data of different Modules inside a Monolith

During my first attempt of implementing an project with the "Clean Architecture" I try to implementation a job portal where I came across a problem concerning the communication between (hopefully) two ...
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46 views

How does a framework manager, broker or coordinator class handle pluggable extensions and make them run?

I'm trying to understand if there is a manager/broker/coordinator class in frameworks and I hope so, but what possible ways are in a framework to make it run the pluggable extensions and what the term ...
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0answers
40 views

Splitting aggregate leads to inconsistencies in data

What I'm going for is something like GNUCash or any type of personal finance tracking software that looks similar to this: That is the main page listing all your accounts; then when you click an ...
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78 views

Expected behavior from client when thinking about design patterns?

I'm confused about the behavior I should expect from a client when thinking about design patterns. To be more precise, I'm reading the Head First Design Patterns book, and on the difference between ...
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76 views

Hierarchy of models while designing a client for a RESTful service

I am trying to write a client for a restful service. I am confused in designing the models. Below are the details: I have a Model named UnicastMessageRequest, it's definition is like this: ...
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0answers
1k views

design pattern/oop for large validation rule set

I'm writing this in node.js I have some data that needs validating before anything can be done with this. The data is validated in two different ways. I can use JSONSchema to validate the structure ...
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0answers
60 views

Is it okay to have an asymmetric relationship between entities in a JavaEE data model?

I'm having difficulties assessing a design decision regarding entity relations in a JavaEE persistence data model. Let's say I want to design a simple data model that's supposed to represent a ...
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300 views

Constructing a stateful allocator using an interface

I have the following abstract class which implements the "Allocator" concept, using policies and traits to customize behavior: #define FORWARD_ALLOCATOR_TRAITS(C) \ typedef ...
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256 views

How to decompose workflow's node classes DDD-way?

System model has Workflow container class, instances of which may contain subclasses of the Node class, specialized for different behaviors (eg, Initial, Intermediate1, Intermediate2, Final). There ...
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68 views

Hierarchical data structure: pull requests + pull request reviews + pull request review comments

GitHub has: pull requests pull request reviews pull request review comments BitBucket has only: pull requests pull request comments So there are three kinds of objects. I write code ...
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122 views

Should all classes and interfaces ultimately derive from one Class, and how does this affect type safety?

If I have "Object" as the top level class, then I have various interfaces, ISomething, ISomethingB, ISomethingC, then I have Class x,y,z, all ultimately deriving from the class Object (these ...
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492 views

How to Make Reusable Classes/Package in Laravel for Billing which uses PaymentExpress?

I am working on a Laravel Project where we are Payment Express. What currently we are doing is that we have Payment Express Class with static function (Not a single property) like given below: Class ...
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0answers
87 views

Creating duplicate instances of objects for timeline functionality

I am working on a Spring-MVC based project, in which I would like to add Timeline functionality. The most important object in our project is the Note, there are objects associated with it like ...
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0answers
3k views

Change object state in different point in program

This is not about whether or not getters/setters are wrong. I understand its impact to encapsulation and that question has been raised here and SO several times already. I also do not want to just ...
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246 views

Lazy loading collection data through granular subscriptions and OOP (Meteor.js)

I am transforming my Meteor collection to a class I've created: People = new Mongo.Collection('people', { transform: function(doc) { return new Person(doc); } }); Person has a bunch of ...
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153 views

C++ object design

I am programming a database similar to Cassandra. I use C++. Simplified database store its data in one or two "memory table" and several "disk tables", all stored in single directory. I have class ...
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331 views

How and where to make global function file in jsp sevlet web application

I am making a website in Servlet&JSP. I am looking for good way to make a specific function file from where I can call and declare my common functions. If I made a java file function. Java, so is ...
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0answers
379 views

How to separate out below tightly coupled classes

I have two classes which are somewhat tightly coupled to one another. Lets call them A and B. A derives from C and B derives from D. B is the class whose instance is created by the system and then B ...
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63 views

Adding new Interface & Replacing Method with Interface Type

Let's say that I have 2 classes: Foo and Bar. `Foo` { List<Bar> bars String bippy() int boop() } `Bar` { int biz() String baz() } Observe that Foo's fields include a List<Bar>. ...
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0answers
57 views

Class/Object with different sets of configurations, singletons etc (PHP)

I want to produce maintainable code for configuring one or multiple classes differently depending whether in a production or development environment. For example, making a Paypal class/object that ...
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0answers
94 views

using internal or external iterators over graph edges

I've written some code to manipulate sparse graphs for school work I'm doing, and I have an operation which requires me to loop over all the edges of a graph. The interface I need to implement is some ...
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1answer
79 views

Best way to code actions and their criteria/checks

I've been trying to make my code cleaner and I have came across an issue which I don't know what the best solution is. This is the code I want to "clean". Please bare in mind that I am refactoring ...
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30 views

Multiple external API calls and only one valid response depends on the parameters value

In my microservice I need to call several external API. The problem is that I do not know which of them to call to get a proper response, but I am sure that one of them return a successful response. I ...
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22 views

How to support alternative behaviour at the end of a pipeline when the new behaviour is decided at the beginning?

Let's assume we have a few loosely coupled components that form a pipeline. At the end is an file generating component. A new requirement comes in that requires an parallel alternative behaviour for ...
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1answer
79 views

DDD design: Tracking price calculation progress and fallback price calculation

I am pretty new to DDD, so any help/ideas will be appreciated. I will explain my initial design and problem below. The user can ask the system to generate products proposal, proposal is basically ...
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111 views

In what cases is Polymorphism useful?

I know how Polymorphism works, but I am trying to understand in what cases is Polymorphism useful. Now All the examples that I have found about Polymorphism are one of the following (the below code ...
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52 views

How to design a nodejs API as typical OOP way using typescript?

I need to design a nodejs typescript API using typical OOP way with controllers and modals, here I am adding a code base for invoice API of the system. can anyone suggest best approach to design in ...
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31 views

Inheritance and instance-storage design suggestions in Django system

I am learning Django and to make the most out of the educational process I am thinking of this hypothetical system and tries to figure out how I would design and implement it. The hypothetical system ...
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1answer
104 views

Could this be considered a valid State GoF Pattern implementation?

For teaching purpose, I would like to create a simple implementation of State Pattern using PHP 7.4. So, I've tried to create a simple "document state machine" starting with Draft, sending to review ...
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Python - Options for accessing class attributes/methods from other classes while keeping classes encapsulated?

I'm teaching myself python and am working on a space invaders clone. Pretty much everything is working as I want it to. But I'm also trying to teach myself good principles of object-oriented design. ...