從ScalatraServlet外部訪問Scalatra的isDevelopmentMode

Question

我有辦法從ScalatraServlet以外訪問isDevelopmentMode值嗎？它似乎來自ScalatraKernel的特質，那麼包括這是一個可行的選擇？

我想要實現的是使DI配置知道我是處於開發模式還是生產中能夠配置數據庫設置。我目前正在爲DI使用Subcut。

Answer 1

我在Scalatra的servlet的發展模式設置爲配置/系統屬性值

object AppEnv { 
    private val cloader = getClass.getClassLoader 

    val PRODUCTION = "production".intern 
    val DEVELOPMENT = "development".intern 
    val STAGING = "staging".intern 
    val TEST = "test".intern 

    lazy val environment = readEnvironmentKey(println _) 

    def isProduction = isEnvironment(PRODUCTION) 
    def isDevelopment = isEnvironment(DEVELOPMENT) 
    def isStaging = isEnvironment(STAGING) 
    def isTest = isEnvironment(TEST) 
    def isEnvironment(env: String) = environment.toLowerCase(Locale.ENGLISH) == env.toLowerCase(Locale.ENGLISH) 

    def readEnvironmentKey(failWith: String ⇒ Unit = _ ⇒ null) = { 
    (ep("BACKCHAT_MODE") orElse sp("backchat.mode")) getOrElse { 
     val inferred = "development" 
     failWith("no environment found, defaulting to: " + inferred) 
     inferred 
    } 
    } 

    private def sp(key: String) = { 
    val s = System.getProperty(key) 
    if (s != null && s.trim.nonEmpty) Some(s) else None 
    } 
    private def ep(key: String) = { 
    val s = System.getenv(key) 
    if (s != null && s.trim.nonEmpty) Some(s) else None 
    } 
} 

trait ApplicationModes extends ScalatraKernel { 
    override def environment: String = AppEnv.environment 
    override def isDevelopmentMode = environment != AppEnv.PRODUCTION && environment != AppEnv.STAGING 
} 

Scalatra的，您還可以使用系統屬性來設置模式，你都不可能讀取性能並得到類似結果。 -Dorg.scalatra.environment =開發