logging.scala

// Usage
log.debug(s"Writing batched data to DB (singles: ${data.size}, arrays ${arrayData.size})")

// Implementation
def debug(message: String): Unit = macro LoggerMacro.debugMessage

// Macro
  def debugMessage(c: LoggerContext)(message: c.Expr[String]) = {
    import c.universe._
    val underlying = q"${c.prefix}.underlying"
    q"if ($underlying.isDebugEnabled) $underlying.debug($message)"
  }

type LoggerContext = Context { type PrefixType = Logger }