Questions tagged [abstract-factory]

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Cross-cutting concerns and dependency injection

I've got a web application with an architecture somewhat like a front-controller MVC design. I get HTTP requests, route them, run them through a filter layer, dispatch them to my domain classes which ...
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1answer
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General question on Pairing of Abstract Factory with Bridge

I am trying to get myself familiarized with the design patterns and I am reading through this line on the relationships between different patterns. I cannot get my head around this one though, You ...
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4answers
117 views

Factories and static methods

So almost every post I read about oop by purists, they keep stressing about how using static methods is anti pattern and breaks the testability of the code. On the other hand every time I look for ...
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1answer
74 views

Can this simple Bank example be considered as a valid Abstract Factory?

For teaching purposes, I'm trying to replicate in a more faithful way from this conceptual UML (from wikipedia): In a "so-so" real world example, in my case, families of Loans and Insurances: So, ...
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2answers
184 views

Abstract Factory: Can Client Class have an aggregation with the Factory?

After searching for some Abstract Factory examples using modern programming languages, I have some dillemas about the sensu lato of conceptual UML schema of Abstract, more specificly about the Client (...
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8answers
2k views

What's the benefits to use an abstract factory when using interfaces is already suffice?

I get the idea of the factory pattern, but I feel that it is really not necessary to use this pattern. For example, below is some code I saw (C#) that use factory method: public interface IAnimal { ...
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4answers
237 views

How to get a decoupled design without injecting repositories inside entities

I am facing the following situation: I have to develop a system that has to calculate the price of a car so i need to calculate the prices of all the Pieces that make up the car and then total them. ...
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1answer
135 views

What does related or dependent mean here?

In Elements of Reusable Object Oriented software by Erich Gamma and friends, the intent for Abstract Factory Pattern says: Provide an interface for creating families of related or dependent objects ...
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2answers
392 views

What is abstract about the Abstract Factory?

I've been always wondering why the Abstract Factory Pattern is actually called abstract? I don't understand what is abstract about it? It somehow does not fit in the image of abstract classes that I ...
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0answers
123 views

Best design pattern/approach for a Factory which needs multiple types of input

I want to develop a Factory of INotifications. public interface INotification { string Text { get; } string UserId { get; } NotificationType NotificationType { get; } } The problem is, ...
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3answers
436 views

Abstract Factory configuration differences

is a simple abstract factory. I know abstract factory is for selecting a product family. But my question is, can we still use this pattern if ConcreteFactory1 needs to createProductC() but ...
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1answer
1k views

How to avoid the static_cast/dynamic_cast in `Abstract Factory` design pattern?

We are using Abstract Factory design pattern in our project, as the project became complex, most of the time the concrete class functionality need to separate to multiple class. As the following code ...
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1answer
263 views

Convenience vs Decoupling/Composition

Let's say I have a small CD burning library written in Python, with a CD class and a Burner interface + implementation classes: # Module cd.py class CD: def __init__(self): self.folders = [] ...
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1answer
483 views

Abstract factory design pattern

I need help with an abstract factory pattern design.I have and calculation engine which calculates for different channels like captive, captiveTemplate or Headquarter and in the future different ...
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4answers
1k views

In which way does the factory pattern decouple classes dependency?

I understand that the main code uses the factory to return an abstract pointer of the object desired, but it doesn't change the heritability of classes. Can you explain in which context does the ...
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1answer
203 views

C# - How can I ensure a member is invoked without needing to call it and rely on the { get; }

I'm using reflection as a way of implementing a factory pattern: Type type = GetProviderType(vendor); ConstructorInfo constructorInfo = type.GetConstructor(new Type[] { typeof(...
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1answer
115 views

How to keep IDs in sync when using Factory?

abstract class Product { public abstract Product createProduct(); ... } class OneProduct extends Product { ... static { ProductFactory.instance().registerProduct("ID1", new OneProduct(...
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2answers
757 views

Can a single Factory be used to create similar in purpose, but different in focus objects?

I am concerned about whether or not I am using FactoryMethod correctly. Background: I am refactoring legacy code and I have identified a pattern: there is a God Object that is created in memory,...
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1answer
191 views

Abstract Factories Nesting and DI - Is this acceptable?

I am still trying to get some experience with DI. Let me illustrate my situation and you can give me advice on whether I am using DI and Abstract Factory correctly. I need to create IModels at ...
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1answer
688 views

Merits of DI, Abstract Factory implementation review

I'm writing a brand new system and trying to stay true to the SOLID principles, specifically Interfacing and Dependency Injection. We are sticking closely to the Microsoft stack so we are using C# ...
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3answers
1k views

Pattern to use (if any) to co-ordinate loosely coupled classes with strong interdependencies

I have a collection of cooperative classes whose behaviors are interdependent upon one another. But I wish to keep them loosely coupled, so I've created appropriate interfaces. I want to determine an ...
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1answer
246 views

Making more than one instance of factory that is supposed to be singleton

However, there are some classes that should have only one instance. Sometimes they are factories, which you can use to create the other objects in the system. If more than one factory exist, ...
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2answers
279 views

Is there a Factory Pattern distinct from Abstract Factory and Factory Method?

During a recent phone screen I was asked to describe the "Factory Pattern". I asked if the screener meant "Factory Method" or "Abstract Factory". He said, "No, just the Factory Pattern". I don't know ...
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1answer
2k views

Should Uncle Bob's example be refactored to an AbstractFactory or a SimpleFactory?

In the book "Clean Code" Robert Martin makes a statement regarding the following code: public Money calculatePay(Employee e) throws InvalidEmployeeType { switch (e.type) { case COMMISSIONED: ...