require 'active_support/secure_random' require 'active_support/core_ext/module/delegation' module ActiveSupport module Notifications class Instrumenter attr_reader :id def initialize(notifier) @id = unique_id @notifier = notifier end # Instrument the given block by measuring the time taken to execute it # and publish it. Notice that events get sent even if an error occurs # in the passed-in block def instrument(name, payload={}) time = Time.now begin yield(payload) if block_given? rescue Exception => e payload[:exception] = [e.class.name, e.message] raise e ensure @notifier.publish(name, time, Time.now, @id, payload) end end private def unique_id SecureRandom.hex(10) end end class Event attr_reader :name, :time, :end, :transaction_id, :payload def initialize(name, start, ending, transaction_id, payload) @name = name @payload = payload.dup @time = start @transaction_id = transaction_id @end = ending end def duration @duration ||= 1000.0 * (@end - @time) end def parent_of?(event) start = (self.time - event.time) * 1000 start <= 0 && (start + duration >= event.duration) end end end end