Play scala中ApplicationLifecycle挂钩中的可调用类型错误

Posted 2023-03-12

【中文标题】Play scala中ApplicationLifecycle挂钩中的可调用类型错误

【英文标题】：Wrong type of callable in ApplicationLifecycle hooks in play scala

【发布时间】：2021-03-15 18:16:14

【问题描述】：

我正在尝试在我们的应用程序（Play Scala）中注册服务停止挂钩。

根据这些文档，它非常简单。 https://www.playframework.com/documentation/2.8.x/PluginsToModules#Create-a-Module-class 应该是这样的：

@Singleton
class AblyService @Inject() (ablyRealtime: AblyRealtime, lifecycle: ApplicationLifecycle) 

  def getChannel(name: String): Channel = ablyRealtime.channels.get(name)

  lifecycle.addStopHook  () =>
    Future.successful(ablyRealtime.close())
  

但是，我收到类型不匹配错误：

[error] /Users/shurikag/ProcessStreet/dev/process-street/app/features/ably/AblyService.scala:15:22: type mismatch;
[error]  found   : scala.concurrent.Future[Unit]
[error]  required: java.util.concurrent.CompletionStage[_]
[error]     Future.successful(ablyRealtime.close())

正确的做法是什么？

【参考方案1】：

猜你使用的是 Java API play.inject.ApplicationLifecycle（需要 CompletionStage）而不是 Scala one（接受 Future）。