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: system.rb
    path of file: ./repos/jenkins_api_client/lib/jenkins_api_client
    
    the code of the file until where you have to start completion: #
# Copyright (c) 2012-2013 Kannan Manickam <arangamani.kannan@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE US
    
      def quiet_down
        @logger.info "Performing a quiet down of jenkins..."
        @client.api_post_request("/quietDown")
      end

      # Cancels the quiet down request sent to the server.
      #
      def cancel_quiet_down
        @logger.info "Cancelling jenkins form quiet down..."
        @client.api_post_request("/cancelQuietDown")
      end

      # Checks if server is in quiet down mode.
      #
      def check_quiet_down?
        @logger.info "Checking if jenkins is in quiet down mode..."
        @client.root.quieting_down?
      end

      # Restarts the Jenkins server
      #
      # @param [Boolean] force whether to force restart or wait till all
      #               jobs are completed.
      #
      def restart(force = false)
        if force
          @logger.info "Performing a force restart of jenkins..."
          @client.api_post_request("/restart")
        else
          @logger.info "Performing a safe restart of jenkins..."
          @client.api_post_request("/safeRestart")
        end
      end

      # Performs a force restart of Jenkins server
      #
      def restart!
        restart(true)
      end

      # Reload the Jenkins server
      #
      def reload
        @logger.info "Reloading jenkins..."
        @client.api_post_request("/reload")
      end

      # List all users known to Jenkins by their Full Name
      #
      def list_users
        warn "DEPRECATION: System#list_users is deprecated. Please use User#list instead"
        @logger.info "Obtaining the list of users from jenkins"
        users = @client.api_get_request("/asynchPeople")
        names = []
        users['users'].each { |user|
          names << user['user']['fullName']
        } unless users.nil?
        return names
      end

      # This method waits till the server becomes ready after a start
      # or restart.
      #
      def wait_for_ready
        Timeout::timeout(@timeout) do
          while true do
            response = @client.get_root
            @logger.info "Waiting for jenkins to restart..."
            if (response.body =~ /Please wait while Jenkins is restarting/ ||
              response.body =~ /Please wait while Jenkins is getting ready to work/)
              sleep 30
              redo
            else
              return true
            end
          end
        end
        false
      end

    end
  end
end