CODEWITHSUNDEEP
javadependency-injectionguice
Amigo
Amigo

Reputation: 109

Using google-guice with out bind code

Is the any way to bind classes not via code:

 bind(MessageService.class).to(FacebookService.class);
 Injector injector = Guice.createInjector(new AppInjector());

But with some annotation?

Upvotes: 0

Views: 54

Answers (1)

Vladimir Matveev
Vladimir Matveev

Reputation: 127781

Yes, there is a way to use annotations to specify bindings, it is explained in the Guice docs. An example from that page:

@ImplementedBy(PayPalCreditCardProcessor.class)
public interface CreditCardProcessor {
  ChargeResult charge(String amount, CreditCard creditCard)
      throws UnreachableException;
}

@ProvidedBy(DatabaseTransactionLogProvider.class)
public interface TransactionLog {
  void logConnectException(UnreachableException e);
  void logChargeResult(ChargeResult result);
}

@ImplementedBy and @ProvidedBy annotations allow to specify bindings implicitly.

However, I'd argue that this is not really a good way to define bindings. Explicitly defined bindings are more composable, and they are concentrated in modules hence they are easier to manage.

Upvotes: 2

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