How to use play.api.inject.Injector to get an annotated instance?

[Guofeng Zhang]

Hi,

I could get the Injector using

  Injector injector = play.api.Play.current().injector() ;

For  

  bind(Hello.class).to(EnglishHello.class);

I could use 

   Hello hello = injector.instanceOf(Hello.class)

to get the instance.

But if the binding is rewritten as

    bind(Hello.class).annotatedWith(Names.named("en")).to(EnglishHello.class);

I do not know how to get the instance using the above way.

Your help is appreciated

Thanks

Guofeng

[Greg Methvin]

Hi Guofeng,

You'd use the Injector#instanceOf(BindingKey) method, and construct a BindingKey with your annotation.

That said, I'm curious why you are trying to retrieve instances directly from the injector. Typically you'd annotate the constructor of your component and have the instance injected automatically by the framework.

Greg

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Greg Methvin

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Lightbend, Inc.

[Guofeng Zhang]

I use Java, so I use BindingKey.apply() to create an instance of BindingKey, then it solved my issue. Thanks.

For the "curious, I just want to do a post for it.

I met a case I do not know how to use DI to solve it.

I have a class OrderSynSubscriber, that is the subclass of AbstractSubscriber. I create a source for it

 Source<Order, ActorRef> orderSource =

     Source.actorPublisher(OrderSynSubscriber.props(.....));

I do not know how to use DI for OrderSynSubscriber. So I get the instance from Injector manually in the class.

The props() is defined as:

public static Props props(String orderUrl, String clientId, Date synTime)

{

        return Props.create(OrderSynSubscriber.class, ()->new OrderSynSubscriber(orderUrl, clientId, synTime));

}

Your advice is appreciated.

Thanks for your help!.

Guofeng

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[Greg Methvin]

I'm assuming you're creating an actor. If you're using Guice, our documentation on dependency injecting actors might help.

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