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play.api.libs.concurrent

AkkaGuiceSupport

trait AkkaGuiceSupport extends AnyRef

Support for binding actors with Guice.

Mix this trait in with a Guice AbstractModule to get convenient support for binding actors. For example:

class MyModule extends AbstractModule with AkkaGuiceSupport {
  def configure = {
    bindActor[MyActor]("myActor")
    bindTypedActor(HelloActor(), "hello-actor")
  }
}

Then to use the above actor in your application, add a qualified injected dependency, like so:

class MyController @Inject() (
    @Named("myActor") myActor: ActorRef,
    helloActor: ActorRef[HelloActor.SayHello],
    val controllerComponents: ControllerComponents,
) extends BaseController {
  ...
}
Self Type
AkkaGuiceSupport with AbstractModule
Source
AkkaGuiceSupport.scala
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  5. def bindActor[T <: Actor](name: String, props: (Props) ⇒ Props = identity)(implicit arg0: ClassTag[T]): Unit

    Bind an actor.

    Bind an actor.

    This will cause the actor to be instantiated by Guice, allowing it to be dependency injected itself. It will bind the returned ActorRef for the actor will be bound, qualified with the passed in name, so that it can be injected into other components.

    T

    The class that implements the actor.

    name

    The name of the actor.

    props

    A function to provide props for the actor. The props passed in will just describe how to create the actor, this function can be used to provide additional configuration such as router and dispatcher configuration.

  6. def bindActorFactory[ActorClass <: Actor, FactoryClass](implicit arg0: ClassTag[ActorClass], arg1: ClassTag[FactoryClass]): Unit

    Bind an actor factory.

    Bind an actor factory.

    This is useful for when you want to have child actors injected, and want to pass parameters into them, as well as have Guice provide some of the parameters. It is intended to be used with Guice's AssistedInject feature.

    Let's say you have an actor that looks like this:

    class MyChildActor @Inject() (db: Database, @Assisted id: String) extends Actor {
  ...
}

    So db should be injected, while id should be passed. Now, define a trait that takes the id, and returns the actor:

    trait MyChildActorFactory {
  def apply(id: String): Actor
}

    Now you can use this method to bind the child actor in your module:

    class MyModule extends AbstractModule with AkkaGuiceSupport {
  def configure = {
    bindActorFactory[MyChildActor, MyChildActorFactory]
  }
}

    Now, when you want an actor to instantiate this as a child actor, inject MyChildActorFactory:

    class MyActor @Inject() (myChildActorFactory: MyChildActorFactory) extends Actor with InjectedActorSupport {

  def receive {
    case CreateChildActor(id) =>
      val child: ActorRef = injectedChild(myChildActorFactory(id), id)
      sender() ! child
  }
}
    ActorClass

    The class that implements the actor that the factory creates

    FactoryClass

    The class of the actor factory

  7. final def bindTypedActor[T](actorModule: Aux[T], name: String)(implicit arg0: ClassTag[T]): Unit

    Bind a typed actor.

    Bind a typed actor.

    Binds Behavior[T] and ActorRef[T] for the given message type T to the given ActorModule and actor name, so that it can be injected into other components. Use this variant of bindTypedActor when using the "functional programming" style of defining your actor's behavior and it needs to be injected with dependencies in dependency scope (such as Configuration).

    The binding of the Behavior happens by installing the given ActorModule into this Guice Module. Make sure to add the Provides annotation on the Behavior-returning method to bind (by convention this is the apply method).

    Note that, while the name is used when spawning the actor in the ActorSystem, it is NOT used as a name qualifier for the binding. This is so that you don't need to use Named to qualify all injections of typed actors. Use the underlying API to create multiple, name-annotated bindings.

    T

    The type of the messages the typed actor can handle.

    actorModule

    The ActorModule that provides the behavior of the typed actor.

    name

    The name of the typed actor.

    Annotations
    @ApiMayChange()
  8. final def bindTypedActor[T](behavior: Behavior[T], name: String)(implicit arg0: ClassTag[T]): Unit

    Bind a typed actor.

    Bind a typed actor.

    Binds Behavior[T] and ActorRef[T] for the given message type T to the given Behavior value and actor name, so that it can be injected into other components. Use this variant of bindTypedActor when using the "functional programming" style of defining your actor's behavior and it doesn't depend on anything in dependency scope.

    Note that, while the name is used when spawning the actor in the ActorSystem, it is NOT used as a name qualifier for the binding. This is so that you don't need to use Named to qualify all injections of typed actors. Use the underlying API to create multiple, name-annotated bindings.

    T

    The type of the messages the typed actor can handle.

    behavior

    The Behavior of the typed actor.

    name

    The name of the typed actor.

    Annotations
    @ApiMayChange()
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