访问Scalatra'；从ScalarServlet外部创建isDevelopmentMode

有没有一种方法可以从

ScalatraServlet

外部访问

isDevelopmentMode

值？它似乎来自于

ScalatraKernel

特性，那么包含它是可行的选择吗

---

我试图实现的是让DI配置知道我是处于开发模式还是处于生产模式，以便能够配置数据库设置。我目前正在使用DI。

我将scalatra servlet中的开发模式设置为config/system属性值

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还允许您使用系统属性设置该模式，您可以读取该属性并获得类似的结果-Dorg.scalatra.environment=开发