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