无结果的类型测试：Option[akka.actor.ActorSystem] 类型的值也不能是 akka.actor.ActorSystem

Question

我正在使用替罪羊进行静态代码分析，我收到一条警告消息

fruitless type test: a value of type Option[akka.actor.ActorSystem] cannot also be a akka.actor.ActorSystem

这是我的代码

object ActorSystemSetting extends ActorSystemSettingTrait{
  val config = ConfigFactory.load()
  val log = LoggerFactory.getLogger(this.getClass)

  var actorSystem  :  Option[ActorSystem] = None
   def createActorSystem: Option[ActorSystem] = {
      actorSystem = Option(ActorSystem("ArteciateActorSystem", config))
      actorSystem
    }

  def getActorSystem  :  Option[ActorSystem] ={
    if (actorSystem == None){
      createActorSystem
    }
    else{
     log.debug("ActorSystem is not null")
    }
    actorSystem
  } 
}

在这部分我收到了警告信息线上

case Some(system: ActorSystem) =>




   Option(ActorSystemSetting.getActorSystem) match {
          case Some(system: ActorSystem) =>
            system.actorOf(Props[PaymentViaCreditDeletionActor]
              , name = "PaymentViaCreditDeletionActor")
          case None => log.debug("ActorSystem is null")
        }
}

Answer 1

你需要改变这个

Option(ActorSystemSetting.getActorSystem) match {

仅此而已：

ActorSystemSetting.getActorSystem match {

ActorSystemSetting.getActorSystem 已经 returns Option(ActorSystem) 所以你不需要把它包装在另一个 Option.

它不起作用，因为您试图将 Option[Option[ActorSystem]] 类型的值与 Some(system: ActorSystem) 类型的值匹配，而 Option[ActorSystem] 类型的值永远无法匹配。

无结果的类型测试：Option[akka.actor.ActorSystem] 类型的值也不能是 akka.actor.ActorSystem

fruitless type test: a value of type Option[akka.actor.ActorSystem] cannot also be a akka.actor.ActorSystem

warnings

static-analysis

scala