Adding memoization

For a practical example of the additional_includes configuration in practice, consider adding new functionality to all Actions.

For instance, at Teamshares we automatically add memoization support (via memo_wise) to all Actions. But we didn't want to add another dependency to the core library, so we've implemented this by:

  Axn.configure do |c|
    c.additional_includes = [TS::Memoization]
  end

module TS::Memoization
  extend ActiveSupport::Concern

  included do
    prepend MemoWise
  end

  class_methods do
    def memo(...) = memo_wise(...)
  end
end

And with those pieces in place memo is available in all Actions:

class ContrivedExample
  include Axn

  exposes :nums

  def call
    expose nums: Array.new(10) { random_number }
  end

  private

  memo def random_number = rand(1..100) 
end

Because of the memo usage, ContrivedExample.call.nums will be a ten-element array of the same number, rather than re-calling rand for each element.