Scala:将配置数据作为全局对象

// 定义一个配置类
case class AppConfig(databaseUrl: String, apiKey: String, logLevel: String)

// 创建一个伴生对象来存储配置数据
object AppConfig {
  val config = new AppConfig(
    databaseUrl = "jdbc:mysql://localhost:3306/mydb",
    apiKey = "secret-api-key",
    logLevel = "INFO"
  )
}

// 在应用程序中使用全局配置对象
object MainApp extends App {
  println(s"Database URL: ${AppConfig.config.databaseUrl}")
  println(s"API Key: ${AppConfig.config.apiKey}")
  println(s"Log Level: ${AppConfig.config.logLevel}")
}

import com.typesafe.config.ConfigFactory

object AppConfig {
  private val config = ConfigFactory.load()
  val databaseUrl = config.getString("database.url")
  val apiKey = config.getString("api.key")
  val logLevel = config.getString("log.level")
}

import java.nio.file.{Files, Paths, StandardWatchEventKinds}
import java.nio.file.WatchService

object ConfigWatcher {
  def watchConfigFile(path: String): Unit = {
    val watcher = FileSystems.getDefault.newWatchService()
    val dir = Paths.get(path).getParent
    dir.register(watcher, StandardWatchEventKinds.ENTRY_MODIFY)

    while (true) {
      val key = watcher.take()
      for (event <- key.pollEvents()) {
        if (event.context().toString == Paths.get(path).getFileName.toString) {
          // 重新加载配置
          AppConfig.reloadConfig()
        }
      }
      key.reset()
    }
  }
}