Dependency

Dependency injection for Elixir. Full documentation

Dependency injection allows you to swap out dependencies when unit testing your modules.

In test mode a Registry is used that holds a mapping between dependency name and implementation. In dev and production mode, the dependency is compiled inline - there is no perormance hit.

Inspired by constantizer

Installation

The package can be installed by adding dependency to your list of dependencies in mix.exs:

def deps do
  [
    {:dependency, "~> 0.2.0"}
  ]
end

Also, you'll need to add the application to your list of applications

def application do
  [
    # ...
    extra_applications: [:dependency],
  ]
end

Usage

Resolving a dependency

import Dependency

mod = Dependency.resolve(MyModule)

Registering an implementation

Dependency.register(MyModule, MyImplementation)

Defining a constant

defmodule Example do
  import Dependency

  # define a public constant/accesor
  defconst :foo, Foo
end

# call accesor to resolve dependecy
Example.foo == Foo

License

MIT