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Contents
# Copyright (c) 2023 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true
module Contrast
module Utils
# A LRU(Least Recently Used) Cache store.
class LRUCache
# Initializes new Least Recently Used Cache Store
#
# @raise [StandardError] raises error if provided capacity is invalid or less or equal to zero
def initialize capacity = 500
raise(StandardError('Capacity must be bigger than 0')) if capacity <= 0
@capacity = capacity
@cache = {}
end
def [] key
val = @cache.delete(key)
@cache[key] = val if val
val
end
def []= key, value
@cache.delete(key)
@cache[key] = value
@cache.shift if @cache.size > @capacity
value # rubocop:disable Lint/Void
end
def keys
@cache.keys
end
def key? key
@cache.key?(key)
end
def values
@cache.values
end
def clear
@cache.clear
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems