JarCastingakka-guice
What?
This is a very simple (so very stable) scala library for injecting Akka using Guice.
Why?
Google search akka guice => some articles:
-
Akka Dependency Injection => just a guide.
-
Akka Scala Guice Activator => just a (complex) demo.
-
Akka Guice Integration for Playframework => I think akka-guice integration should NOT depends on Play!
=> So I create this library :D
How?
-
install akka-guice from maven center ex, add to build.sbt:
libraryDependencies += "com.sandinh" %% "akka-guice" % "3.2.0" -
use akka-guice
see the test files & source code for detail. It's very simple!
- ChildActor: The
fooparameter will be injected
class ChildActor @Inject() (@Named("fooName") foo: String) extends Actor ...
-
AssistedChildActor: Sometimes an Actor gets some of its constructor parameters from the Guice Injector and others from the caller.
Parameter
fooof AssistedChildActor's constructor is taken from Guice.arg1&arg2from the caller.
class AssistedChildActor(foo: String, arg1: Int, arg2: String) extends Actor ...
object AssistedChildActor {
class Factory @Inject() (@Named("fooName") foo: String) extends ActorFactory[AssistedChildActor] {
def create(args: Any*): AssistedChildActor = args match {
case Seq(arg1: Int, arg2: String) => new AssistedChildActor(foo, arg1, arg2)
case _ => throw new IllegalArgumentException
}
}
}
-
ParentActor:
extends com.sandinh.akuice.ActorInject& useinjectActormethod to inject child actors. TheinjectActormethod need animplicit akka.actor.ActorRefFactoryto create actor (using ActorRefFactory#actorOf method).ParentActor extends Actor=> it has animplicit val context: ActorContext(ActorContextextendsActorRefFactory).
class ParentActor @Inject() (val injector: Injector) extends Actor with ActorInject {
private val child1 = injectActor[ChildActor]
private val child2 = injectActor[ChildActor]("child2")
private val assistedChild = injectActor[AssistedChildActor, AssistedChildActor.Factory](1, "arg2 value")
...
}
-
Service.scala: This is not an Actor but because it extends
com.sandinh.akuice.ActorInject=> we can useinjectTopActormethod.Note that, we can also use
injectActormethod. The injected actor will be a child of theimplicit ActorRefFactoryin the scope.
@Singleton
class Service @Inject() (val injector: Injector) extends ActorInject {
private val parentRef = injectTopActor[ParentActor]
def hello(sender: ActorRef) = parentRef.tell("hello!", sender)
}
- AkkaModule:
class AkkaModule(system: ActorSystem) extends AbstractModule {
def configure(): Unit = {
bind(classOf[ActorSystem]).toInstance(system)
//other binds
}
}
- AkuiceSpec:
"Akuice" must {
"inject actors: receive replied messages when call Service.hello" in {
val injector = Guice.createInjector(new AkkaModule(system))
val service = injector.getInstance(classOf[Service])
service.hello(self)
//expectMsg ...
}
}
Changelogs
see CHANGES.md
Licence
This software is licensed under the Apache 2 license: http://www.apache.org/licenses/LICENSE-2.0
Copyright 2014-2017 Sân Đình (http://sandinh.com)