Class: EnvelopeAlloc::Provider

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(total_num, alloc_num, options = {}) ⇒ Provider

Returns a new instance of Provider.



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# File 'lib/envelope_alloc.rb', line 8

def initialize total_num, alloc_num, options={}
  @total_num = total_num
  @alloc_num = alloc_num
  @unit = options[:unit] || 100
  @item_max = options[:item_max] || (200 * @unit)
end

Instance Attribute Details

#alloc_num ⇒ Object (readonly)

Returns the value of attribute alloc_num.



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# File 'lib/envelope_alloc.rb', line 6

def alloc_num
  @alloc_num
end

#item_max ⇒ Object (readonly)

Returns the value of attribute item_max.



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# File 'lib/envelope_alloc.rb', line 6

def item_max
  @item_max
end

#total_num ⇒ Object (readonly)

Returns the value of attribute total_num.



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# File 'lib/envelope_alloc.rb', line 6

def total_num
  @total_num
end

#unit ⇒ Object (readonly)

Returns the value of attribute unit.



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# File 'lib/envelope_alloc.rb', line 6

def unit
  @unit
end

Instance Method Details

#alloc_items ⇒ Object 



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# File 'lib/envelope_alloc.rb', line 15

def alloc_items
  return [total_num] if alloc_num == 1

  money_left = (total_num - alloc_num * unit)

  value_vec = []
  0.upto(alloc_num-2) do |i|
    mu = money_left / (alloc_num - i)
    sigma = mu / 2
    rg = RandomGaussian.new(mu, sigma)
    noise_value = rg.rand.to_i
    noise_value = 0 if noise_value < 0
    noise_value = money_left if noise_value > money_left
    threshold_value = item_max - unit
    noise_value = threshold_value if noise_value > threshold_value
    value_vec << (noise_value + unit)
    money_left -= noise_value
  end

  money_left = (total_num - value_vec.reduce(&:+))
  last_money = money_left > item_max ? item_max : money_left
  value_vec << last_money
  money_left = money_left - last_money
  split_left_items(money_left, value_vec)
  value_vec
end

#split_left_items(money_left, value_vec) ⇒ Object 



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# File 'lib/envelope_alloc.rb', line 42

def split_left_items(money_left, value_vec)
  return unless money_left > 0
  value_vec.map! do |val|
    gap = item_max - val
    if money_left > gap
      money_left -= gap
      item_max
    else
      value = val + money_left
      money_left = 0
      value
    end
  end
end