Guice @Provides Methods vs Provider Classes

Question

I\'m working on a fairly large project that has a lot of injections. We\'re currently using a class that implements Provider for each injection that needs one,

Answer 1

There is also a difference in how classes are instantiated. For Eg :

public class GumProvider implements Provider {

  public Gum get() {
    return new Gum();
  }
}

---

public class GumModule extends AbstractModule {

    protected void configure() {

        bind(Gum.class).toProvider(GumProvider.class);
        //bind(Gum.class).to(GumballMachine.class);
    }
}

---

public class GumballMachine {

    @Inject
    private Provider gumProvider;

    Gum gum;


    public Gum dispense() {
        return gumProvider.get();
    }
}

---

public class App {

    public static void main(String[] args) {
      // TODO Auto-generated method stub
      Injector injector = Guice.createInjector(new GumModule());
      GumballMachine m = injector.getInstance(GumballMachine.class);
      System.out.println(m.dispense());
      System.out.println(m.dispense());


    }

}

This would create an Instance of Gum Per Invocation. Whereas if @Provides were used the same Instance of Gum would be passed to both the Injectors