59 lines
1.4 KiB
Ruby
59 lines
1.4 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Utils
|
|
module StrongMemoize
|
|
# Instead of writing patterns like this:
|
|
#
|
|
# def trigger_from_token
|
|
# return @trigger if defined?(@trigger)
|
|
#
|
|
# @trigger = Ci::Trigger.find_by_token(params[:token].to_s)
|
|
# end
|
|
#
|
|
# We could write it like:
|
|
#
|
|
# include Gitlab::Utils::StrongMemoize
|
|
#
|
|
# def trigger_from_token
|
|
# strong_memoize(:trigger) do
|
|
# Ci::Trigger.find_by_token(params[:token].to_s)
|
|
# end
|
|
# end
|
|
#
|
|
def strong_memoize(name)
|
|
key = ivar(name)
|
|
|
|
if instance_variable_defined?(key)
|
|
instance_variable_get(key)
|
|
else
|
|
instance_variable_set(key, yield)
|
|
end
|
|
end
|
|
|
|
def strong_memoized?(name)
|
|
instance_variable_defined?(ivar(name))
|
|
end
|
|
|
|
def clear_memoization(name)
|
|
key = ivar(name)
|
|
remove_instance_variable(key) if instance_variable_defined?(key)
|
|
end
|
|
|
|
private
|
|
|
|
# Convert `"name"`/`:name` into `:@name`
|
|
#
|
|
# Depending on a type ensure that there's a single memory allocation
|
|
def ivar(name)
|
|
if name.is_a?(Symbol)
|
|
name.to_s.prepend("@").to_sym
|
|
elsif name.is_a?(String)
|
|
:"@#{name}"
|
|
else
|
|
raise ArgumentError, "Invalid type of '#{name}'"
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|