[英]Scala Play 2 Guice dependency injection with traits
在我的应用程序中,我具有以下特征/混凝土类:
在models.daos
:
trait UserDAO // UserDAO.scala
class UserDAOImpl @Inject() (app: play.api.Appliction) extends UserDAO // UserDAOImpl.scala
在包controllers
:
class Application @Inject() (userDao: UserDAO) extends Controller
但是,当我运行该应用程序时,我得到:
ProvisionException: Unable to provision, see the following errors:
1) No implementation for models.daos.UserDAO was bound.
while locating models.daos.UserDAO
for parameter 0 at controllers.Application.<init>(Application.scala:15)
while locating controllers.Application
for parameter 1 at router.Routes.<init>(Routes.scala:31)
while locating router.Routes
while locating play.api.inject.RoutesProvider
while locating play.api.routing.Router
我是依赖注入的新手,并不真正知道如何告诉Guice使用具体的类。
您需要扩展AbstractModule
class DaoModule extends AbstractModule {
def configure() = {
bind(classOf[UserDAO])
.to(classOf[UserDAOImpl])
}
}
在conf/application.conf
您需要添加:
play.modules.enabled += "modules.DaoModule"
您需要在代码中的某个位置创建注入器,通常是在Play模块的Global对象中:
object Global extends GlobalSettings {
val injector = Guice.createInjector(
new AbstractModule {
protected def configure() = {
bind(classOf[UserDAO]).to(classOf[UserDAOImpl])
}
}
)
...
}
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