相关疑难解决方法(0)

我想要这样的东西:

private val cachedResponse = mutable.Option.empty[A]

def get: A = cachedResponse getOrElseUpdate db.findModel()

def update: Unit = {
  db.updateModel
  cachedResponse.empty()    // set it to None/Option.empty
}

我不是在寻找像这样的泛型基于HashMap的memoization .我尝试使用a实现它,var Option[A]但它对我来说看起来不是很惯用:

private var cachedResponse: Option[A] = None

def get: A = cachedResponse getOrElse {
 cachedResponse = Option(db.findModel())
 cachedResponse.get
}

def update: Unit = {
  db.updateModel
  cachedResponse = None
}