Another example for xco on #ruby IRC

cache.rb

require_relative 'tuple_space'

class Cache
  def initialize
    @memory = TupleSpace.new(reaper_period_in_secs: 10, expires_in_secs: 60)
  end

  def get(request)
    @memory[request]
  end

  def set(request, response)
    @memory[request] = response
  end
end

Typhoeus::Config.cache = Cache.new

Typhoeus.get("www.example.com").cached?
#=> false

Typhoeus.get("www.example.com").cached?
#=> true

##
# Wait 60-70 seconds...
Typhoeus.get("www.example.com").cached?
#=> false

tuple_space.rb

require 'rinda/tuplespace'

class TupleSpace < Rinda::TupleSpace
  # 600 seconds is ten minutes and 86,400 seconds is 3 hours
  def initialize reaper_period_in_secs: 600, expires_in_secs: 10_800
    @expires_in_secs = expires_in_secs
    super reaper_period_in_secs
  end

  def []= key, value
    take [key, nil], true
  rescue Rinda::RequestExpiredError
    nil
  ensure
    write [key, value], @expires_in_secs
  end

  def [] key
    read([key, nil], true).last
  rescue Rinda::RequestExpiredError
    nil
  end

  def delete key
    take([key, nil], true).last
  rescue Rinda::RequestExpiredError
    nil
  end
end