Class: Tuttle::Instrumenter

Inherits:
Object
  • Object
show all
Defined in:
lib/tuttle/instrumenter.rb

Class Method Summary collapse

Class Method Details

.initialize_tuttle_instrumenter ⇒ Object 



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# File 'lib/tuttle/instrumenter.rb', line 10

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|
    app_path = Rails.root.join('app').to_s
    cache_call_location = caller_locations.detect { |cl| cl.path.start_with?(app_path) }
    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
    Tuttle::Engine.logger.info('Cache Generate called')
  end
end