Must Dependency Injection come at the expense of Encapsulation?

Posted by urig on Stack Overflow See other posts from Stack Overflow or by urig
Published on 2009-06-17T06:58:01Z Indexed on 2010/03/24 0:43 UTC
Read the original article Hit count: 414

Filed under:

dependency-injection

|

inversion-of-control

|

encapsulation

|

oop

If I understand correctly, the typical mechanism for Dependency Injection is to inject either through a class' constructor or through a public property (member) of the class.

This exposes the dependency being injected and violates the OOP principle of encapsulation.

Am I correct in identifying this tradeoff? How do you deal with this issue?

Please also see my answer to my own question below.

© Stack Overflow or respective owner

Related posts about dependency-injection

How does dependecy injection increase coupling?

as seen on Programmers - Search for 'Programmers'
On the Wikipedia page on dependency injection, the disadvantages section tells us this: Dependency injection increases coupling by requiring the user of a subsystem to provide for the needs of that subsystem. with a link to an article against dependency injection. Dependency injection makes… >>> More
SubCut Scala Dependency Injection Framework

as seen on Gooder Code - Search for 'Gooder Code'
It’s no secret I am a fan of dependency injection. So I was happy to hear that Dick Wall of the Java Posse recently released a dependency injection framework for scala. Called SubCut, or Scala Uniquely Bound Classes Under Traits, the project is a ‘mix of service locator and dependency… >>> More
Dependency Injection Constructor Madness

as seen on Stack Overflow - Search for 'Stack Overflow'
I find that my constructors are starting to look like this: public MyClass(Container con, SomeClass1 obj1, SomeClass2, obj2.... ) with ever increasing parameter list. Since "Container" is my dependency injection container, why can't I just do this: public MyClass(Container con) for every class… >>> More
What are the downsides to using Dependency Injection?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to introduce DI as a pattern here at work and one of our lead developers would like to know: What - if any - are the downsides to using the Dependency Injection pattern? Note I'm looking here for an - if possible - exhaustive list, not a subjective discussion on the topic. >>> More
Using a Dependency Injection Container in an enterprise solution with multiple different configurati

as seen on Stack Overflow - Search for 'Stack Overflow'
Can anyone point me towards some good documentation / code examples on how best to manage the configuration of a DI container in a scenario where you need different configuations sets? We have a layered, distributed application that has multiple entry points (ie; a website, winforms app, office plugin… >>> More

Related posts about inversion-of-control

What is Inversion of control and why we need it?

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Most of programmer need inversion of control pattern in today’s complex real time application world. So I have decided to write a blog post about it. This blog post will explain what is Inversion of control and why we need it. We are going to take a real world example so it would be better to understand… >>> More
SPRING: What is AOP, Dependency Injection and Inversion Of Control in Simple English

as seen on Stack Overflow - Search for 'Stack Overflow'
I have tried to understand AOP, Dependency Injection and Inversion of Control SPRING related concepts but I am having hard time understanding it. Can anyone explain this in simple English ? >>> More
Simple Inversion of Control framework for Java/Scala

as seen on Stack Overflow - Search for 'Stack Overflow'
I am looking for a simple to use IoC container for GUI applications written in Java/Scala. It should support Convention over Configuration, lifecycle management, configuration in code (preferably without any XML needed at all), and checking dependencies at compile-time as much as possible. Something… >>> More
Inversion of Control Resource

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Well… this is going to be another really short blog posting. I have been meaning to read more about IOC containers and came across this blog post which seemed to really explain the concept well – based on Castle Windsor. I also enjoyed reading the replies about IOC on stack overflow and what it… >>> More
Inversion of Control Container for PHP?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to code TDD style in PHP and one of my biggest stumbling blocks (other than lack of a decent IDE) is that I have to make my own hacked together IoC container just to inject all my mock objects properly. Has anyone used an Ioc container in php? All I've been able to find is PHP IOC on… >>> More