Comments on: Dependency injection and service locator

By: yong

yong — Mon, 01 Feb 2010 22:44:24 +0000

Hi, very interesting article. Simple and easy to understand.

I have one question, what is the difference between the Factory and Service Locator?

Thanks

By: malovicn

malovicn — Sat, 23 May 2009 09:54:35 +0000

Json,

you are right from pattern point of view but...

Applying DI without the help of IoC container is quite an overkill and lead to broken encapsulation and if you think about DI in context of IoC containers you would see that each one of the IoC containers performing DI (Unity, StructureMap, Windsor, Ninject etc) have allways a ServiceLocator class which you use to register, retrieve your services.

IMHO, In that context SL could be called as a technique of performing DI altought I am aware it is Fowler POEA pattern

Please check out some of my more recent post presenting my views on the necessity of SL in big corps

blog.vuscode.com/.../dependency-injection-in-real-world.aspx

By: Json

Json — Fri, 08 May 2009 17:51:28 +0000

This was a good article all the way up until you said, "Service Locator is a dependency injection technique".

DI is a pattern like SL. However, DI is a pattern to achieve IoC. The roots of IoC is changing who is in control. A component that internally resolves it's own dependencies is in control (SL style). This is the traditional way. A component that is given dependencies is NOT in control (DI style). This is IoC in the context of dependency resolution.

DI achieves IoC, SL does not.

By: malovicn

malovicn — Tue, 23 Dec 2008 12:04:30 +0000

I've just blog posted another blog post touching the same subject (Service locator vs. Dependency injection) from a different and a little bit more advanced angle

blog.vuscode.com/.../dependency-injection-in-real-world.aspx

By: Zaletskyy Yuriy

Zaletskyy Yuriy — Fri, 28 Nov 2008 15:21:30 +0000

Thanks for this explanation. It is very usefull for me. I needed some easy to understand explanation for my