dependency injection pattern for factories and services

kinja-core-di.scala

trait Driver

trait TestDriver

class PostFactory {
	def hello = "post"
}

class BlogFactory {
	def hello = "blog"
}

trait FactoryContainer {
	val postFactory: PostFactory
	val blogFactory: BlogFactory
}

trait ProductionFactoryContainer extends FactoryContainer {
	val postFactory = new PostFactory with Driver
	val blogFactory = new BlogFactory with Driver
}

trait TestFactoryContainer extends FactoryContainer {
	val postFactory = new PostFactory with TestDriver
	val blogFactory = new BlogFactory with TestDriver
}

class PostService {
	this: FactoryContainer =>

	def foo(implicit blogService: BlogService) = blogService.bar
	def bar(implicit blogService: BlogService) = blogService.baz

}

class BlogService {
	this: FactoryContainer =>

	def foo(implicit postService: PostService, blogService: BlogService) = postService.bar
	def bar = blogFactory.hello
	def baz = postFactory.hello

}

object ProductionDIConfig {
	implicit val postService = new PostService with ProductionFactoryContainer
	implicit val blogService = new BlogService with ProductionFactoryContainer

}

object TestDIConfig {
	implicit val postService = new PostService with TestFactoryContainer
	implicit val blogService = new BlogService with TestFactoryContainer
}

object PostController {

	import ProductionDIConfig._
	def foo = postService.foo
	def bar = postService.bar

}

object PostTest {

	import TestDIConfig._
	def foo = postService.foo

}