canvas-lms/lib/timed_cache.rb

class TimedCache
  def initialize(timeout, &block)
    @timeout = timeout
    @block = block
    @cached_at = Time.now
  end

  def clear(force = false)
    if force || @cached_at < @timeout.call()
      @block.call()
      @cached_at = Time.now
      true
    else
      false
    end
  end
end