Class: Tuttle::Instrumenter

Inherits:

Object

• Object
• Tuttle::Instrumenter

Defined in:

lib/tuttle/instrumenter.rb

Constant Summary

@@events =

[]

@@event_counts =

Hash.new(0)

@@cache_events =

[]

Class Method Summary

• .initialize_tuttle_instrumenter ⇒ Object

Class Method Details

.initialize_tuttle_instrumenter ⇒ Object

# File 'lib/tuttle/instrumenter.rb', line 9

def self.initialize_tuttle_instrumenter
  # For now, only instrument non-production mode
  unless Rails.env.production?
    ActiveSupport::Notifications.subscribe(/.*/) do |*args|
      event = ActiveSupport::Notifications::Event.new(*args)
      Tuttle::Instrumenter.events << event
      Tuttle::Instrumenter.event_counts[event.name] += 1
    end
  end

  # Note: For Rails < 4.2 instrumentation is not enabled by default. Hitting the cache inspector page will enable it for that session.
  Tuttle::Engine.logger.info('Initializing cache_read subscriber')
  ActiveSupport::Notifications.subscribe('cache_read.active_support') do |*args|
    cache_call_location = caller_locations.detect { |cl| cl.path.start_with?("#{Rails.root}/app".freeze) }
    event = ActiveSupport::Notifications::Event.new(*args)

    Tuttle::Engine.logger.info("Cache Read called: #{cache_call_location.path} on line #{cache_call_location.lineno} :: #{event.payload.inspect}")

    event.payload.merge!({:call_location_path => cache_call_location.path, :call_location_lineno => cache_call_location.lineno })
    Tuttle::Instrumenter.cache_events << event
  end

  ActiveSupport::Notifications.subscribe('cache_generate.active_support') do |*args|
    Tuttle::Engine.logger.info('Cache Generate called')
  end

end