define_instance_states do
    start.to( :pending )          .automatically
    pending.to( :running )        .automatically
    pending.to( :stopping )       .on( :stop )
    pending.to( :stopped )        .automatically
    stopped.to( :running )        .on( :start )
    running.to( :running )        .on( :reboot )
    running.to( :stopping )       .on( :stop )
    shutting_down.to( :stopped )  .automatically
    stopped.to( :finish )         .automatically
  end


  def convert_state(ec2_state)
    case ec2_state
    when "terminated"
      "STOPPED"
    when "stopped"
      "STOPPED"
    when "running"
      "RUNNING"
    when "pending"
      "PENDING"
    when "shutting-down"
      "STOPPED"
    end
  end