play scala 中的 ApplicationLifecycle 挂钩中的错误类型可调用

Question

我正在尝试在我们的应用程序 (Play Scala) 中注册服务停止挂钩。

基于这些文档，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，我遇到类型不匹配错误：

[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？

Answer 1

猜猜你使用 Java API play.inject.ApplicationLifecycle (which expects CompletionStage) and not the Scala one（它接受 Future）。

play scala 中的 ApplicationLifecycle 挂钩中的错误类型可调用

Wrong type of callable in ApplicationLifecycle hooks in play scala

scala

playframework

hook

application-lifecycle