Class: VSphereCloud::Resources::Util

Inherits:
Object
  • Object
show all
Defined in:
lib/cloud/vsphere/resources/util.rb

Overview

Resources common utility class.

Class Method Summary collapse

Class Method Details

.average_csv(csv) ⇒ Numeric

Returns the average value from a given CSV string.

Parameters:

  • csv (String) —

    CSV string of integers/floats.

Returns:

  • (Numeric) —

    average value



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# File 'lib/cloud/vsphere/resources/util.rb', line 14

def average_csv(csv)
  values = csv.split(",")
  result = 0
  return result if values.empty?
  values.each { |v| result += v.to_f }
  result / values.size
end

.weighted_random(list) ⇒ Object

Returns a random item from the given list distributed based on the provided weight.

Parameters:

  • list (Array) —

    array of tuples containing the item and weight.

Returns:

  • (Object) —

    random item based on provided weight.

Raises:

  • (ArgumentError) 


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# File 'lib/cloud/vsphere/resources/util.rb', line 27

def weighted_random(list)
  return nil if list.empty?

  weight_sum = list.inject(0) { |sum, x| sum + x[1] }
  index = rand(weight_sum)
  offset = 0
  list.each do |el, weight|
    offset += weight
    return el if index < offset
  end

  # Should never happen
  raise ArgumentError, "index: #{index} sum: #{weight_sum}"
end