Class: CFCM::Monkey::SoftMonkey

Inherits:
Object
  • Object
show all
Defined in:
lib/cfcm/monkey.rb

Instance Method Summary collapse

Constructor Details

#initialize(session, app_name, probability, min, max, frequency) ⇒ SoftMonkey

Returns a new instance of SoftMonkey.



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# File 'lib/cfcm/monkey.rb', line 9

def initialize(session, app_name, probability, min, max, frequency)
  @session = session
  @app_name = app_name
  @app = @session.get_app(app_name)
  @probability = probability
  @min_instances = min
  @max_instances = max
  @frequency = frequency
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/cfcm/monkey.rb', line 19

def start
  EventMachine.run do
    EventMachine.add_periodic_timer(@frequency) do
      # Determine if we should unleash the monkey
      if (Random.rand(100) + 1) <= @probability
        @app = @session.get_app(@app_name)
        instances = @app.total_instances
        max_growth = @session.max_instance_growth(@app_name)
        
        if instances > @max_instances
          puts "Shrink due to instance limitations"
          @app = @session.remove_instance(@app)
        elsif instances < @min_instances
          puts "Grow due to instance limitations"
          @app = @session.add_instance(@app)
        elsif max_growth == 0 || @max_instances == instances
          # Shrink
          puts "Shrink due to instance limitations"
          @app = @session.remove_instance(@app)
        elsif instances == @min_instances
          # Grow
          puts "Grow due to instance limitations"
          @app = @session.add_instance(@app)
        elsif Random.rand(2) == 0
          # Shrink
          puts "Shrink due to randomness"
          @app = @session.remove_instance(@app)
        else
          #Grow
          puts "Grow due to randomness"
          @app = @session.add_instance(@app)
        end
      end
    end          
  end
end