MemoizeUntil

This gem is an extension to the standard memoization pattern for storing expensive computations or network calls in-memory. Unlike other memoization extensions which expire after a pre-defined interval, this gem provides a consistent memoization behavior across multiple processes/servers i.e. keys expire simultaneously across all processes.

Usage:

gem install memoize_until
> irb
irb:> require 'memoize_until'
irb:> result = MemoizeUntil.day(:default) do
irb:>   # PerformSomeComplexOperation
irb:> end # memoizes(until the end of the day) and returns the result of #PerformSomeComplexOperation
irb:> p result.inspect

The default API that the gem provides is: MemoizeUntil#min, MemoizeUntil#hour, MemoizeUntil#day, MemoizeUntil#week, MemoizeUntil#month with default purposes(keys).

To add new purposes during run_time, you can also leverage the add_to API:

irb:> MemoizeUntil.add_to(:day, :runtime_key) 
irb:> result = MemoizeUntil.day(:runtime_key) do
irb:>   # PerformSomeComplexRuntimeOperation
irb:> end # memoizes(until the end of the day) and returns the result of #PerformSomeComplexOperation
irb:> p result.inspect

The same can be done for other default kinds as well: min, hour, week, month

Rails

To use this gem in a rails application, add the following line to your Gemfile and you are good to go.

gem 'memoize_until'

For most use cases, the list of purposes that come will not suffice. You can define your custom list of config purposes that you wish to memoize for, by including a config/memoize_until.yml in the root directory of your application. Here is an example to help you with the file structure.

Testing

To clear the currently memoized value for a purpose, you can use the clear_now API.

irb:> MemoizeUntil.day(:default) { 1 } # 1
irb:> MemoizeUntil.clear_now_for(:day, :default) 
irb:> MemoizeUntil.day(:default) { 2 } # 2

Note: This API only clears the currently memoized value in the current running process and will not mitigate to other processes in a multiprocess world. This is recommended to be used only for testing setup.

Contributing

To run test cases,

bundle install
ruby -Ilib:test test/memoize_until_test.rb

This project is Licensed under the MIT License. Further details can be found here.