You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dbiff.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/sample/drb
    
    the code of the file until where you have to start completion: #
# dbiff.rb - distributed cdbiff (server)
#  * original: cdbiff by Satoru Takabay
    
  def run
    last = Time.now
    while true
      begin
        sleep(@interval)
        current = File::mtime(@filename)
        if current > last
          changed
          begin
            notify_observers(@filename, current)
          rescue Error
          end