Someone today asked for a way to aggregate timings of operations in different places across an app. This is a single threaded solution.

timer.rb

class Timer
  include Singleton
  
  def initialize
    Thread.current[:timers] ||= Hash.new(0)
  end

  def display(timer)
    Thread.current[:timers][timer]
  end

  def reset(timer)
    Thread.current[:timers][timer] = 0
  end

  def time(timer, &block)
    start = Time.zone.now
    block.call
    time_end = Time.zone.now

    Thread.current[:timers][timer] += time_end - start
  end
end

def time(timer, &block)
  Timer.instance.time(timer, &block)
end