Create my own ActorSystem on play 2.5

[Tomer ben dror]

Hi,

I have noticed this description on the official play documentation that there is the option to create my own ActorSystem for the play application

(https://www.playframework.com/documentation/2.5.x/ScalaAkka#Using-your-own-Actor-system), 

Could anyone describe  how to do it using Guice DI

Thanks, Tomer

[Greg Methvin]

There are several ways to do it. Typically when you want to override bindings you can disable the Play-provided module and create your own module with the same bindings, so your configuration would look like:

play.modules.enabled += "com.example.FooModule"

play.modules.disabled += "play.FooModule"

The annoying thing here is that ActorSystem is in BuiltinModule, which has a ton of other bindings (see https://github.com/playframework/playframework/blob/master/framework/src/play/src/main/scala/play/api/inject/BuiltinModule.scala#L31). You'd have to repeat those bindings, or otherwise obtain them from BuiltinModule.

So another way is to extend the GuiceApplicationLoader and add an override:

class CustomApplicationLoader extends GuiceApplicationLoader() {

  override def overrides(context: Context) = super.overrides(context) ++ Seq(

    bind[ActorSystem].toProvider[CustomActorSystemProvider]

  )

}

The Seq of bindings is a Seq[GuiceableModule] so you can pass Guice modules instead of Play bindings too.

Greg

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Greg Methvin

Senior Software Engineer

Lightbend, Inc.