IoC Dependency Injection for stateful objects (not global)

Question

I\'m new to this IoC and DI business- I feel like I get the concept if you are passing along objects that are of a global scope, but I don\'t get how it works when you need to p

Answer 1

Well, you can always inject an Abstract Factory into your consumer and use it to create the locally scoped objects.

This is sometimes necessary. See these examples:

• MVC, DI (dependency injection) and creating Model instance from Controller
• Is there a pattern for initializing objects created via a DI container
• Can't combine Factory / DI

However, in general we tend to not use DI for Entities, but mostly for Services. Instead, Entities are usually created through some sort of Repository.

Answer 2

When you construct an service object (e.g. WriteFileService), you inject into it things it needs internally to complete it's job. Perhaps it needs a filesystem object or something.

The Person object in your example should be passed to the service object as a parameter to a method call. e.g. writeFileService.write(person)