I would appreciate if I could get some help with the following. I am trying
to do dependency injection for traits that have bounded parameter type. I
am consistently having
No implementation for dao.ImageDAO<models.ProductImageSet> was bound. while
locating dao.ImageDAO<models.ProductImageSet>
trait ImageDAO[T <: ImageSet] {
def find(id: String): ImageDisplay[T]
def find(req: ImageSearch): ImageResponse[T]
}
class ProductImageDAO @Inject() (environment: Environment) extends
ImageDAO[ProductImageSet] {
...
}
class ProfileImageDAO @Inject() (environment: Environment) extends
ImageDAO[ProfileImageSet] {
...
}
case class ProductImageSet(swatchImage: BaseImage, smallImage: BaseImage,
mediumImage: BaseImage, largeImage: BaseImage) extends ImageSet
case class ProfileImageSet(smallImage: BaseImage, mediumImage: BaseImage)
extends ImageSet
And now, the service trait and its implementation
trait ImageService[A <: ImageSet] {
def retrieve(id: String): ImageDisplay[A]
def retrieve(req: ImageSearch): ImageResponse[A]
}
class ImageServiceImpl[T <: ImageSet] @Inject() (imageDAO: ImageDAO[T]) extends
ImageService[T] {
def retrieve(id: String): ImageDisplay[T] = imageDAO.find(id)
def retrieve(req: ImageSearch): ImageResponse[T] = ???
}
Here is my class Module.scala where I want the dependency injection to
happen.
class MyModule extends AbstractModule {
protected override def configure() {
bind(new
TypeLiteral[ImageDAO[ProductImageSet]](){}).to(classOf[ProductImageDAO]).asEagerSingleton()
bind(new
TypeLiteral[ImageService[ProfileImageSet]](){}).to(classOf[ImageServiceImpl[ProfileImageSet]]).asEagerSingleton()
bind(new
TypeLiteral[ImageService[ProductImageSet]](){}).to(classOf[ImageServiceImpl[ProductImageSet]]).asEagerSingleton()
}
}
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