46 lines
1.2 KiB
Ruby
46 lines
1.2 KiB
Ruby
|
# 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
|