nathanl/caches

module Caches
  module Stats

    def initialize_data
      @hits   = 0
      @misses = 0
      super
    end

    def stats
      {hits: @hits, misses: @misses, hit_rate: hit_rate}
    end

    private

    def record_cache_hit
      @hits += 1
    end

    def record_cache_miss
      @misses += 1
    end

    def hit_rate
      attempts = Float(@hits) + Float(@misses)
      ratio    = attempts.zero? ? 0.0 : Float(@hits) / attempts
      "#{ratio * 100}%"
    end

  end
end