2015-08-28-DataStoreAbstractions-MigratingUserStore

MigratingUserStore.scala

class MigratingUserStore(origin: UserStore, destination: UserStore) extends UserStore {
  def find(userId: UserId): Option[User] = {
    destination.find(userId) match {
      case None =>
        origin.find(userId)
      case result => 
        result.map(user => destination.save(user))
    }
  }
  
  def save(user: User): User = {
    origin.save(user)
    destination.save(user)
  }
}