这里下面是一个Play应用程序的常规项目布局:用蛋糕图案时如何构建一个游戏项目
myProject
+ app
+ controllers
+ models
+ views
我想controllers
,models
和views
内容很清楚,我们中的大多数。现在假设我们需要用蛋糕图案来实现DAO服务:
DaoServiceComponent.scala
:
trait DaoServiceComponent[A] {
def daoService: DaoService
trait DaoService {
def insert(entity: A): Future[A]
def find(id: Id): Future[Option[A]]
...
}
}
trait DefaultDaoServiceComponent[A] extends DaoServiceComponent[A] {
this: DaoComponent[A] =>
def daoService = new DaoService {
def insert(entity: A) = dao.insert(entity)
def find(id: Id) = dao.find(id)
...
}
}
DaoComponent.scala
:
trait DaoComponent[A] {
def dao: Dao
trait Dao {
def insert(entity: A): Future[A]
def find(id: Id): Future[Option[A]]
...
}
}
UserDaoComponent.scala
:
trait UserDaoComponent extends DaoComponent[User] {
protected val collection: JSONCollection
def dao = new Dao {
def insert(entity: User): Future[User] = {
...
}
def find(id: Id): Future[Option[User]] = {
...
}
}
}
最后,我们在我们的控制器对象连线了一切如常:
object Users extends Controller {
private val userService: DaoServiceComponent[User]#DaoService =
new DefaultDaoServiceComponent[User]
with UserDaoComponent {
val collection = db.collection[JSONCollection]("users")
}.daoService
def create = Action.async(parse.json) { implicit request =>
request.body.validate[User].fold(
valid = { user =>
userService.insert()..
...
}
}
现在回到我们的项目布局,我们应该在哪里放DaoServiceComponent
,DaoComponent
,UserDaoComponent
,和任何其他支持类?这些文件是否应该放在services
目录中?
myProject
+ app
+ controllers
+ models
+ services
+ DaoComponent.scala
+ DaoException.scala
+ DaoServiceComponent.scala
+ EmailServiceComponent.scala
+ RichEmailComponent.scala
+ ServiceException.scala
+ UserDaoComponent.scala
+ ...
+ views