Modern Akka DI with Guice

Question

Java 8, Guice 4.0 and Akka 2.3.9 here. I am trying to figure out how to annotate my actor classes with JSR330-style @Inject annotations, and then wire them all up v

Answer 1

In case anyone found this question, you need to use IndirectActorProducer, I referred to the Spring example and changed it to use Guice instead.

/**
 * An actor producer that lets Guice create the Actor instances.
 */
public class GuiceActorProducer implements IndirectActorProducer {
    final String actorBeanName;
    final Injector injector;
    final Class actorClass;

    public GuiceActorProducer(Injector injector, String actorBeanName, Class actorClass) {
        this.actorBeanName = actorBeanName;
        this.injector = injector;
        this.actorClass = actorClass;
    }

    @Override
    public Actor produce() {
        return injector.getInstance(Key.get(Actor.class, Names.named(actorBeanName)));
    }

    @Override
    public Class actorClass() {
        return actorClass;
    }
}

In the module

public class BookingModule extends AbstractModule {

    @Override
    protected void configure() {               
        // Raw actor class, meant to be used by GuiceActorProducer.
        // Do not use this directly
        bind(Actor.class).annotatedWith(
                Names.named(BookingActor.ACTOR_BEAN_NAME)).to(
                BookingActor.class);
    }

    @Singleton
    @Provides
    @Named(BookingActor.ACTOR_ROUTER_BEAN_NAME)
    ActorRef systemActorRouter(Injector injector, ActorSystem actorSystem) {
      Props props = Props.create(GuiceActorProducer.class, injector, BookingActor.ACTOR_BEAN_NAME, actorClass);
      actorSystem.actorOf(props.withRouter(new RoundRobinPool(DEFAULT_ROUTER_SIZE)), BookingActor.ACTOR_ROUTER_BEAN_NAME);
    }
}