Class: Distem::Events::EventGenerator

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# File 'lib/distem/events/eventgenerator.rb', line 8

def initialize(resource_desc, change_type, generator_desc, event_value = nil, random_generators = nil)

  @generator_desc = generator_desc
  @random_generators = {}
  @random_generators = random_generators if random_generators

  if change_type == 'churn'
    event_value = 'down' unless event_value

    if @generator_desc['date']
      if @generator_desc['availability'] or @generator_desc['unavailability']
        raise "You cannot give a date generator and an availability or unavailability generator"
      end

      # same distribution for avaibility and unavailability time
      @generator_desc['availability'] = @generator_desc['date']
      @generator_desc['unavailability'] = @generator_desc['date']
      @generator_desc['date'] = nil
    else
      unless @generator_desc['availability'] and @generator_desc['unavailability']
        raise "You must give availability and unavailability generators"
      end
    end

    @random_generators['availability'] = RngStreamRandomGenerator.new unless @random_generators['availability']
    @random_generators['unavailability'] = RngStreamRandomGenerator.new unless @random_generators['unavailability']

  else
    raise "No description given for the date generator" unless @generator_desc['date']
    raise "No description given for the value generator" unless @generator_desc['value']

    @random_generators['value'] = RngStreamRandomGenerator.new unless @random_generators['value']

    event_value = get_random_value('value')
    if change_type == 'power'
      # For this event,  non-integer values are accepted only if between 0 and 1
      event_value = event_value.round if event_value > 1
    else
      #No integer value allowed - As 0 means infinity in some cases, we only start from 1
      event_value = event_value.round
      event_value = 1 if event_value == 0
    end
  end

  super(resource_desc, change_type, event_value)

  @random_generators['date'] = RngStreamRandomGenerator.new unless @random_generators['date']

end

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# File 'lib/distem/events/eventgenerator.rb', line 58

def get_next_date
  if @change_type == 'churn'
    if @event_value == 'down'
      # The resource will be down on the next trigger; for the moment, it should be up.
      # So we use the availability distribution to compute the next date
      return get_random_value('availability')
    else
      return get_random_value('unavailability')
    end
  else
    return get_random_value('date')
  end
end