Using modules inside services

[Hyun Joon Seol]

I'm fairly new to Finatra and injection in general, so I may not have the right concept here. 

I have a service that does some application logic. The interface is defined as

trait Foo {

  def foo(): Unit

  def bar(): Unit

}

And let's say I have some different implementations of Foo. I understand I can use `.bind` inside modules to bind specific implementations of Foo.

One of these implementations uses postgres. So before I write the application logic for that implementation, I want to have a module that just deals with postgres connections, so I think I need a module that @provides a connection. I've written that part.

And now I want to write the implementation. Should the implementation be another module, or should it be something like a `service` i.e. https://github.com/twitter/finatra/blob/develop/examples/twitter-clone/src/main/scala/finatra/quickstart/services/TweetsService.scala ?

If the implementation should be a service, how can I inject a module inside that service? will using @inject suffice? What would be the most "Finatra" way of implementing this?

[Yufan Gong]

Hi Hyun,

I think you are able to write each implementation as a service, not sure if this is the most "Finatra" approach though. You could take a look at RedisUrlShortenerService(https://github.com/twitter/finatra/blob/develop/examples/tiny-url/src/main/scala/com/twitter/tiny/services/impl/RedisUrlShortenerService.scala). In this example, it also uses @Inject for JedisClient which is provided in JedisClientModule(https://github.com/twitter/finatra/blob/develop/examples/tiny-url/src/main/scala/com/twitter/tiny/modules/JedisClientModule.scala), so I think it is doable as long as you add your postgresClient module to the additional modules sequence.

Thanks!

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[Hyun Joon Seol]

@Inject actually worked like a charm. Thanks for your help!

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