First up sorry to reply to such an old post, but it appears pretty high in
search when I look for the problem, so figured anyone else finding it would
appreciate an answer if they found the same post.
I'm very new to Scala and trying to work out how I can use the previous
pattern for dependency injection, when the Guice Module itself needs
references to instances passed in from elsewhere.
But since traits can't have constructors, and neither can the Companion
Object it looks like I'm screwed?
package au.id.rleach.overmind.guice
import com.google.inject.{Provides, Guice, Binder, Module}
import org.slf4j.Logger
import org.spongepowered.api.service.ServiceManager
import org.spongepowered.api.world.TeleportHelper
import org.spongepowered.api.{GameRegistry, Game}
import org.spongepowered.api.plugin.PluginManager
import org.spongepowered.api.scoreboard.ScoreboardBuilder
import org.spongepowered.api.service.event.EventManager
class OModule(val game: Game, val logger: Logger, val pluginManager:
PluginManager, val serviceManager: ServiceManager, val eventManager:
EventManager, val gameRegistry: GameRegistry, val teleportHelper:
TeleportHelper) extends Module {
override def configure(binder: Binder): Unit = {
binder.bind(classOf[Game]).toInstance(game)
binder.bind(classOf[Logger]).toInstance(logger)
binder.bind(classOf[PluginManager]).toInstance(pluginManager)
binder.bind(classOf[ServiceManager]).toInstance(serviceManager)
binder.bind(classOf[EventManager]).toInstance(eventManager)
binder.bind(classOf[GameRegistry]).toInstance(gameRegistry)
binder.bind(classOf[TeleportHelper]).toInstance(teleportHelper)
//bind(classOf[File]).annotatedWith(new
ConfigDirAnnotation(true)).toInstance(Loader.instance.getConfigDir)
}
}
trait ServiceInjector {
ServiceInjector.inject(this)
}
object ServiceInjector {
private val injector = Guice.createInjector(
//####
new OModule()//compilation error.
//####
)
def inject(obj: AnyRef) = injector.injectMembers(obj)
}
I realize that the object is being initialized when the class is loaded,
and that is before I even have a copy of the instance to pass to OModule,
so it seems the whole advice is flawed?
On Monday, December 22, 2008 at 9:57:41 PM UTC+10:30, Jan Kriesten wrote:
>
>
> > Can you give me a demo that about integrate scala into guice?
>
> Well, it's actually almost as referred to you in the link from the other
> answer:
>
> http://jonasboner.com/2008/10/06/real-world-scala-dependency-injection-di/
>
> class MyClient {
> @Inject val toBeInjected: AnotherClass = toBeInjected // !!
> }
>
> trait ServiceInjector {
> ServiceInjector.inject( this )
> }
>
> object ServiceInjector {
> private val injector = Guice.createInjector( Array[Module]( new
> YourModule ) )
> def inject( obj: AnyRef ) = injector.injectMembers( obj )
> }
>
> Usage:
>
> val client = new MyClient with ServiceInjector
>
> or:
>
> class InjectedMyClient extends MyClient with ServiceInjector
>
> Best regards, --- Jan.
>
>
>
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