zengkid / feather

Lightweight dependency injection for Java and Android (JSR-330)

####About Feather#### Feather is an ultra-lightweight dependency injection (JSR-330) library for Java and Android. Dependency injection frameworks are often perceived as "magical" and complex. Feather - with just a few hundred lines of code - is probably the easiest, tiniest, most obvious one, and is quite efficient too

The fork add below features:

1. auto inject the fields

    feather = Feather.with( /* modules if needed*/ );// if use this, then the speed as fast as original's

change to

    feather = Feather.withAutoInjectFields( /* modules if needed*/ ); // will lost some performance.

2. add like guice style provider

for example:

    public interface Service {
        public void say();
    }

two implements

    public class ServiceImpl1 implements Service {
        public void say() {
            System.out.println("say 1.");
        }
    }

    public class ServiceImpl2 implements Service {
        public void say() {
            System.out.println("say 2.");
        }
    }

create a module to binding the implements

    Module myModule = new Module() {
        @Override
        public void configure(Binding binding) {
            binding.bind(UserService.class, UserServiceImpl.class);
            binding.bind(UserService.class, UserServiceImpl2.class, "userService2");
        }
    }

usage:

    public class Controller {

        @Inject
        private Service service1;

        @Inject
        @Named("service2")
        private Service service2;


        public void say() {
            service1.say();
            service2.say();
        }

        public static void main(String[] args) {
            Feather feather = Feather.withAutoInjectFields(new Module(){
                @Override
                public void configure(Binding binding) {
                    binding.bind(Service.class, ServiceImpl1.class);
                    binding.bind(Service.class, ServiceImpl2.class, "service2");
                }
            });
            Controller controller = feather.instance(Controller.class);

            controller.say();
        }
    }

The output:

    say 1.
    say 2.