玩！2.0 Scala - 访问全局对象 [英] Play! 2.0 Scala - Accessing global object

问题描述

我已经声明了一个在应用程序启动时被实例化的对象.我想在控制器中访问它，它是插件的一部分.我希望能够使用该插件，但我似乎无法超越第一部分——找到 MyWebsocketConnection 对象.没有一个示例显示如何执行此操作.我不想注入控制器，因为我正在编写一个插件(我在某处看到了如何执行此操作的静态示例).

I've declared an object which gets instantiated on application start. I want to access it inside a controller, which is part of a plugin. I want to be able to use that plugin, but I can't seem to get past the first part -- finding the MyWebsocketConnection object. None of the examples show how to do this. I don't want to inject into the controller because I'm writing a plugin (I saw static examples of how to do that somewhere).

Global.scala，插件应用程序appGlobal.scala

Global.scala, plugin application appGlobal.scala

object Global extends GlobalSettings {

  object MyWebsocketConnection {
    val logger = // return something that gets instantiated once, like websocket object for logging to ui
  }

  class MyWebsocketConnection {
    import MyWebsocketConnection.logger
  }

  override def onStart(app: Application) {
    Logger.info("Application has started...");
  }

}

我的自定义日志插件控制器:

My custom logging plugin controller:

MyLogger.Scala，插件应用程序appcontrollersMyLogger.scala

MyLogger.Scala, plugin application appcontrollersMyLogger.scala

object MyLogger {

  def info(message: String) = {
    // THIS CAN'T BE FOUND ?
    // MyWebsocketConnection.logger.send(message)
  }

}

所以，从戏剧！2.0 应用程序引用该插件，我会(可能)做类似下面的事情，但我什至无法超越这之前的部分:

So, from the Play! 2.0 app that references the plugin, I would (probably) do something like below, but I can't even get past the part before this:

MyFutureController.scala，又一个 Play！应用程序appcontrollersMyFutureController.scala

MyFutureController.scala, another Play! application appcontrollersMyFutureController.scala

object MyFutureController extends Controller {
  def someRandomMethod = Action {
    // Custom logging
    MyLogger.info("Here's my log message!");
    Ok("This documentation stinks!")
  }
}

推荐答案

还有解决方法 #3:将您的 Global 类移动到一个包中，并在 application.conf 文件中指定其完全限定名，如下所示:

There is also workaround #3: move your Global class to a package and specify its fully qualified name in application.conf file, like so:

global=my.packaged.Global

global= my.packaged.Global

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