scala:如何在guice模块内部注入

Question

我是新手，这是我的代码

trait MyRepository
class MyRepositoryImp extends MyRepository
trait MyService
class MyServiceImp @Inject()(myRepository:MyRepository) extends MyService
class Demo @Inject(myService:MyService)
class RepositoryModule extends AbstractModule {
override protected def configure(): Unit = {
bind(classOf[MyRepository]).toInstance(new MyRepositoryImpl)
}
}
class ServiceModule extends AbstractModule {
override protected def configure(): Unit = {
bind(classOf[MyService]).toInstance(new MyService(//what should i pass in here?))
}
}

我的问题是在ServiceModule中，我如何在MyService构造函数中传递注入的MyRepository参数

Answer 1

尝试使用@Provides注释

import com.google.inject.{AbstractModule, Guice, Inject, Injector, Provides}
import scala.jdk.CollectionConverters._
trait MyRepository {}
class MyRepositoryImp extends MyRepository {}
trait MyService {}
class MyServiceImp @Inject() (myRepository: MyRepository) extends MyService {}
class Demo @Inject() (myService: MyService) { println("Woohoo, I am wired!") }
class Module extends AbstractModule {
@Provides def repository: MyRepository = new MyRepositoryImp
@Provides def service(repo: MyRepository): MyService = new MyServiceImp(repo)
@Provides def demo(service: MyService): Demo = new Demo(service)
}
object guiceExample extends App {
val injector: Injector = Guice.createInjector(List(new Module).asJava)
val demo = injector.getInstance(classOf[Demo])
}

其输出CCD_ 3。