Guice eager singleton in production mode

[Tomer Praizler]

Hey, 

I have configured my guice module to instantiate one of my classes as eager in production and lazy in dev mode, based on guice documentation.

So this is my code:

import com.google.inject.{Singleton, AbstractModule}
import com.mylib.{MonitorActor, Reporter}
import play.api.libs.concurrent.AkkaGuiceSupport

class MyModule extends AbstractModule with AkkaGuiceSupport {
  def configure() = {
    bindActor[MonitorActor]("monitor-actor")

    bind(classOf[Reporter]).in(classOf[Singleton])
  }
}

The thing is, it doesn't get instantiated in production!

Only when using .asEagerSingleton(), but this is not good for me, I don't want this code to be instantiated in dev mode.

Am I missing anything?

[Christian Schmitt]

in(Singleton) means something different.

The only thing would be binding to eagerSIngleton and then check the environment.mode if you run the code inside the binded class depending on environment.mode == Mode.Dev

[Tomer Praizler]

Thats awesome..it worked for me!

Out of curiosity when should I use in(Singlton) ? 

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[Christian Schmitt]

Currently if you annotate your object with @Singleton it is the same as .in(Singleton)

https://github.com/google/guice/wiki/Scopes#choosing-a-scope

Here is more about scopes.

However "normally" in(Scope.Singleton) would bind eagerly on production. However the Scope Singleton is more for a heavyweight object which shouldn't be created everytime.

[Tomer Praizler]

Awesome!