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# frozen_string_literal: true
module Gitlab
module Utils
module LazyAttributes
extend ActiveSupport::Concern
include Gitlab::Utils::StrongMemoize
class_methods do
def lazy_attr_reader(*one_or_more_names, type: nil)
names = Array.wrap(one_or_more_names)
names.each { |name| define_lazy_reader(name, type: type) }
end
def lazy_attr_accessor(*one_or_more_names, type: nil)
names = Array.wrap(one_or_more_names)
names.each do |name|
define_lazy_reader(name, type: type)
define_lazy_writer(name)
end
end
private
def define_lazy_reader(name, type:)
define_method(name) do
strong_memoize("#{name}_lazy_loaded") do
value = instance_variable_get("@#{name}")
value = value.call if value.respond_to?(:call)
value = nil if type && !value.is_a?(type)
value
end
end
end
def define_lazy_writer(name)
define_method("#{name}=") do |value|
clear_memoization("#{name}_lazy_loaded")
instance_variable_set("@#{name}", value)
end
end
end
end
end
end
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