Questions tagged [inversion-of-control]
Inversion of control (IoC) is an abstract principle describing an aspect of some software architecture designs in which the flow of control of a system is inverted in comparison to procedural programming.
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If you use Inversion of Control, what alternatives to obfuscated function calls exist?
Consider a class that follows the obfuscated function call anti-pattern. I've also seen these called "stupid classes". The definition of such a class is that it only has one public method ...
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How to use an external event queue with inversion of control (IoC)
I'm working on an AspNetCore application, with a requirement to raise and handle certain events asynchronously using an external event queue. I'll use AWS services as examples here because that's what ...
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Why do we separate interface when implementing interface injection variant of DI?
With interface injection (wikpedia) we have a method to set the dependency on the client as part of an interfase.
public interface ServiceSetter {
public void setService(Service service);
}
Why ...
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Dependency Injection vs Static Dependencies
I am building a wrapper for a library that requires little complex logic. The whole project is 8 builder classes, 4 classes for doing some pre-processing, and a couple visitor classes. Essentially I ...
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Abstracting calls to common library methods in C#
I‘m working on making a legacy code base more testable and made good progress with (constructor)-injecting dependencies to classes.
I noticed something in all classes that access the file system: they ...
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2
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Services should depend on Data or Factories?
I have app which uses IOC container. I have services registered in container, and I can consume either data factory, or particular data object. Which approach is preffereable?
Consuming factory object:...
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Is it safe to use the same IoC container for your own and third-party services?
I am developing an application with ASP.NET Core with the ability to dynamically add new libraries that implement the necessary functions. They can be included at the start.
I have already written ...
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Inject configuration files into the injector is it an antipattern?
I'm trying to design a system that inject configuration of each component into each class.
project structure:
|features
--|component-a
component-a.service.js
component-a.config....
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If it is a bad practice to use an interface if only one class will implement it, what is the purpose of IoC container?
Okay, first of all I understand the concept of IoC container! It's used to implement automatic dependency injection so you won't have to manually inject dependencies to class. It can automatically ...
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Is there a proper way of implementing runtime control of dependencies using DI? Is factory pattern okay? [closed]
I'm currently brushing up and learning about a bunch of techniques to hopefully begin implementing in my own workflow; one of which is IoC (and DI in particular).
I'm hoping someone could clear up my ...
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Is inversion of control the opposite of "tell, don't ask" principle?
First, let me explain what I mean by inversion of control and tell, don't ask in this context. I have 4 classes MailController, UserData, Subscription and MailService. MailController is a consumer of ...
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Dependency Injection: What are advantages of using a framework? [duplicate]
Introduction and Question
I understand what the advantages of dependency injection, e.g. constructor injection or setter injection and that it is one way of doing inversion of control. I also ...
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Inversion of control
I have been reading about inversion of control and dependency injection and I was wondering the following.
Is there a good way to tell when it is okay to initialise an object inside a method body of a ...
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How to decouple chain hierarchy project dependency by dependency injection? (C# .Net Standard)
I'm working on decoupling a Xamarin (.NetStandard) solution. It was using DryIOC container but I didn't see the IOC structure from the dependency, as the projects are still tightly coupled.
Three main ...
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Inversion of control - no "new" in a low level constructor?
When using IoC in a code base, should one always stick strictly to the pattern without exception?
That means there should be no "new" in any constructor, when the newed object has ...
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Dependency access control in DI
As I'm just getting into ASP.NET Core, I'm also continuing to slowly learn about Dependency Injection and still trying to identify some value in it for our practical purposes. The point I've reached ...
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Default value for constructor dependency injection
I have class A that depends on interfaces B & C. I use constructor injection to inject them into A:
class A {
let b: B
let c: C
init(b: B, c: C) {
self.b = b
self....
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Mixing IoC container use with "poor mans" DI
I'm finding the use of IoC containers to be quite the shift in my application design, and its for the better. I'm using a framework called injector that aims to mimic (albeit not entirely) the Guice ...
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How far we have to consider the plug-ability while designing an email service using external library
I was designing an email service in .net standard 2.0 using mailkit library. I proposed the following design
This design was not accepted stating the following reasons:
This design have to many ...
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Instantiating adapters in onion architecture
GitHub and NuGet
Do you use connection strings to instantiate your adapter services or just always configure it through IoC? I think that connection strings could provide a way more flexibility, ...
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What's the difference between Strategy Pattern and IoC
In both the Strategy Pattern and in Inversion of Control you can exchange parts of an object that allows scalability and easy-to-exchange parts. I am referring to this and this
Both use an interface ...
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How to configure and setup an IOC Container for a library?
When using Dependency Injection across internal classes (implementation details) in a library which is to be consumed by multiple applications, is there a good way to configure the IOC container?
...
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IoC/DI + "normal" constructor arguments mvvm
I am using unity in C# to achieve dependency injection and inversion of control.
What if I have a class, let's say a viewmodel, that depends on several services like a repository, a validator and a ...
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Does SOLID Require an IoC Container (Automatic Factory)?
The fifth concept in the SOLID principle is the dependency inversion principle. It is heavily related to dependency injection, and Inversion of control, and when any of these concepts are mentioned, ...
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How to define Composition Roots for libraries (Javascript/inversify)
I'm building a console app (A), which depends on library B. Library B further depends on library C. I am building all 3 entities. Most of the development completed so far has been done using a ...
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Passing runtime-read configuration when working with an IoC container
I've recently "discovered" the IoC realm, and decided to refactor a project I'm working on to use such a container.
To be specific - I'm using autofac in C#, in a .NET Core console application.
The ...
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How to setup up a background thread/task which triggers UI updates?
Background
I'm designing a round-based game where one of the core design goals is to have a highly exchangable UI. For this, I've defined an interface which allows implementers to only focus on ...
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Where does the responsibility for clearing higher-level caches lie in a pyrimidal calculation system with caching at multiple levels?
I'm working on system that analyses non-trivial amounts of data. The analysis is pyramidal, in that various combine to make intermediate values, which in turn combine with each other and more inputs ...
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Is using IoC with data classes a good practice
I usually use IoC frameworks to inject dependencies that are services. Is it ok to mark classes that are data objects as IoC components?
To be more clear I will give an example.
I have an abstract ...
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In some IOC contexts, could constructor of polymorphic immutable object be required in its interface?
Generally, constructors in an interface are considered as being an anti-pattern. Some languages even don't allow that.
Then I don't understand how we're supposed to deal with polymorphic immutable ...
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Passing DI container to a factory – is this always an antipattern?
Generally I would always answer "yes" to this question, because at this point, your DI container has become a service locator, and you're losing the benefits of DI.
However, I wonder if it is ...
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Evaluation of (a)synchronous design of ledger interface
I'm currently designing a ledger API, that should work with different implementations (e.g. based on Blockchain, traditional databases, or files).
Its purpose is to add/get messages to/from a ...
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Is Dependency Injection A Standard in PHP and Laravel?
Or in actuality, how to tell if a certain technique has became a standard in certain language / framework?
As I understood from my readings so far, PHP supports DI in PSR-11 while Laravel uses it out ...
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How can you use DI without DI framework in a reasonably complex project?
edit
I asked this question not because this is my opinion, but because I am trying to understand someone else's. Personally I prefer IoC via DI (in my specific case Simple Injector) but not everybody ...
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Why EJB service Injection requires the specific subclass to be created?
Most Java EE guidelines suggest that we should define Abstract EJB services (APIs) and then define concrete implementations in order to conform with OO design principles.
But at the injection point, ...
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Simple examples of properly designed Asp.Net applications illustrating different service layers?
I've been programming professionally for years now at several different companies and I consider myself to be a fairly competent programmer. However, of everywhere I've worked there are usually dozens ...
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Is Poor Man's Dependency Injection a good way to introduce testability to a legacy application?
In the past year, I created a new system using Dependency Injection and an IOC container. This taught me a lot about DI!
However, even after learning the concepts and proper patterns, I consider it ...
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IOC container & accessing Implementation from the container
Background
As mentioned in this article,
Inversion of Control can be achieved through various mechanisms such as: Strategy design pattern, Service Locator pattern(SLP), Factory pattern, and ...
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Is there evidence that the use of dependency injection improves outcomes in software engineering?
Notwithstanding its popularity, is there any empirical evidence that shows that Dependency Injection (and/or using a DI container) helps with, say, reducing bug counts, improving maintainability, or ...
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Dependency Injection: Creating object factories vs. using inversion of control containers [closed]
When requiring to use dependency injection, I always use IoC containers such as Ninject, Unity, or the built-in one in ASP.Net Core MVC. However, I've just come across the idea of "why not creating an ...
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1
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Responsibility for adding and ordering menu items in a modular application
Following Ordering menu items fed from multiple modules the question was raised to me, who is responsible for ordering and alignment of menu items in a modular application.
The previous link suggests ...
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IoC configurations - one file/assembly in solution or one file per executing assembly?
We're wondering what the best practise for registering types in a IoC-Container is.
What would be arguments for and against the following principles:
Principle 1: Only one Assembly my.project....
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How to pass data between objects when an IoC container is being used?
I'm working with a project that our architect has decided to use dependency injection for almost everything. We use an IoC container. One of the main issues that I keep coming across when using this ...
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Using generics for dependency resolution constraints
I have such problem: the interface with no in and out parameters.
public interface IIndexer
{
void FillIndex();
}
It should work differently for different kinds of activities( comments, likes ...
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What is the generic implementation of design pattern IoC coupled with Factory for DAO? [closed]
I'm learning the java Spring framework. So far, I understood that Spring will make stuff transparent with its configurations so that IoC and Factory are not too complicated to implement...
Now I have ...
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Service locator vs Dependency Injection?
I have a class which acts as a Adaptor between an HTTP request and our Application's custom domain request.
So every Http request element: URI, headers, content are mapped to our customized domain ...
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Image processing - Service locator pattern & Container of dependencies
As per wiki,
A dependency is an object that can be used (as a service).
here is the OOP paradigm using C syntax that address 4 roles, shown below.
1) interface (handlers.h)
typedef struct {
...
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How to create a factory method
Say I have a Business class called person:
public class Student { }
Say I want to create a factory method for this Student class - something like this:
public Student getStudent(string studentType)
...
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Dependency injection for a library with internal dependencies
Background
I am working on a class library in support of a web site. The library combines related APIs from several different vendors, all of which have their own particular nuances and domain ...
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DependencyInjection - Constructor over-injection smell vs service locator - where is the proper approach?
I am trying to improve my MVC projects and I read a few articles about DI, IoC containers, Constructor Injection and Service locators. I wanted to go with Ninject to help with the dependencies, but ...
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