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Contents
module Verdict
module Segmenters
class FixedPercentageSegmenter < BaseSegmenter
def initialize(experiment)
super
@total_percentage_segmented = 0
end
def verify!
raise Verdict::SegmentationError, "Should segment exactly 100% of the cases, but segments add up to #{@total_percentage_segmented}%." if @total_percentage_segmented != 100
end
def register_group(handle, size)
percentage = size.kind_of?(Hash) && size[:percentage] ? size[:percentage] : size
n = case percentage
when :rest; 100 - @total_percentage_segmented
when :half; 50
when Integer; percentage
else Integer(percentage)
end
group = Group.new(experiment, handle, @total_percentage_segmented ... (@total_percentage_segmented + n))
@total_percentage_segmented += n
return group
end
def assign(identifier, subject, context)
percentile = Digest::MD5.hexdigest("#{@experiment.handle}#{identifier}#{self.class.salt}").to_i(16) % 100
groups.values.find { |group| group.percentile_range.include?(percentile) }
end
class Group < Verdict::Group
attr_reader :percentile_range
def initialize(experiment, handle, percentile_range)
super(experiment, handle)
@percentile_range = percentile_range
end
def percentage_size
percentile_range.end - percentile_range.begin
end
def to_s
"#{handle} (#{percentage_size}%)"
end
def as_json(options = {})
super(options).merge(percentage: percentage_size)
end
end
class << self
attr_accessor :salt
end
end
end
end
Version data entries
22 entries across 22 versions & 1 rubygems