gistfile1.rb

    state_machine :initial => :unmonitored do
      state :unmonitored, :up, :down
      
      event :tick do
        transition :unmonitored => :unmonitored
        
        transition [:up, :down] => :up, :if => :process_running?
        transition [:up, :down] => :down, :unless => :process_running?        
      end
      
      event :start do
        transition :unmonitored => :up, :if => lambda {|process| process.process_running? || process.start_process }
        transition :up => :up
        transition :down => :up, :if => :start_process
      end
      
      event :stop do
        transition [:unmonitored, :down] => :unmonitored
        transition :up => :unmonitored, :if => :stop_process
      end
      
      event :restart do
        transition all => :up, :if => :restart_process
      end
      
      event :unmonitor do
        transition all => :unmonitored
      end
      
    end