LoggingSetup.scala

package com.github.rschatz

import com.twitter.app.App
// other imports

trait LoggingSetup { self: App =>
  private val root = LoggerFactory.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME).asInstanceOf[Logger]
  private val context = root.getLoggerContext

  private[this] val logLevel = flag(
    "log.level",
    "info",
    "Default log level (root logger). One of {trace, debug, info, warn, error}"
  )

  init {
    context.reset()
    context.setName("whatever")
    context.addTurboFilter(BroadcastContextOverrideFilter) // explained below
  }

  premain {
    val level = // convert logLevel() to a ch.qos.logback.classic.Level
    root.setLevel(level)

    // setup appenders etc.
  }

  onExit  {
    // stop context
  }
}