Overriding Binding in Guice

Question

I\'ve just started playing with Guice, and a use-case I can think of is that in a test I just want to override a single binding. I think I\'d like to use the rest of the pr

Answer 1

Why not to use inheritance? You can override your specific bindings in overrideMe method, leaving shared implementations in configure method.

public class DevModule implements Module {
    public void configure(Binder binder) {
        binder.bind(InterfaceA.class).to(TestDevImplA.class);
        overrideMe(binder);
    }

    protected void overrideMe(Binder binder){
        binder.bind(InterfaceC.class).to(ConcreteC.class);
    }
};

public class TestModule extends DevModule {
    @Override
    public void overrideMe(Binder binder) {
        binder.bind(InterfaceC.class).to(MockC.class);
    }
}

And finally create your injector this way:

Guice.createInjector(new TestModule());