Action View 日志订阅者

# File actionview/lib/action_view/log_subscriber.rb, line 105
def self.attach_to(*)
  ActiveSupport::Notifications.subscribe("render_template.action_view", ActionView::LogSubscriber::Start.new)
  ActiveSupport::Notifications.subscribe("render_layout.action_view", ActionView::LogSubscriber::Start.new)

  super
end

# File actionview/lib/action_view/log_subscriber.rb, line 12
def initialize
  @root = nil
  super
end

# File actionview/lib/action_view/log_subscriber.rb, line 45
def render_collection(event)
  identifier = event.payload[:identifier] || "templates"

  debug do
    message = +"  Rendered collection of #{from_rails_root(identifier)}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " #{render_count(event.payload)} (Duration: #{event.duration.round(1)}ms | GC: #{event.gc_time.round(1)}ms)"
    message
  end
end

# File actionview/lib/action_view/log_subscriber.rb, line 37
def render_layout(event)
  info do
    message = +"  Rendered layout #{from_rails_root(event.payload[:identifier])}"
    message << " (Duration: #{event.duration.round(1)}ms | GC: #{event.gc_time.round(1)}ms)"
  end
end

# File actionview/lib/action_view/log_subscriber.rb, line 26
def render_partial(event)
  debug do
    message = +"  Rendered #{from_rails_root(event.payload[:identifier])}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " (Duration: #{event.duration.round(1)}ms | GC: #{event.gc_time.round(1)}ms)"
    message << " #{cache_message(event.payload)}" unless event.payload[:cache_hit].nil?
    message
  end
end

# File actionview/lib/action_view/log_subscriber.rb, line 17
def render_template(event)
  info do
    message = +"  Rendered #{from_rails_root(event.payload[:identifier])}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " (Duration: #{event.duration.round(1)}ms | GC: #{event.gc_time.round(1)}ms)"
  end
end

# File actionview/lib/action_view/log_subscriber.rb, line 121
def cache_message(payload) # :doc:
  case payload[:cache_hit]
  when :hit
    "[cache hit]"
  when :miss
    "[cache miss]"
  end
end

# File actionview/lib/action_view/log_subscriber.rb, line 113
def render_count(payload) # :doc:
  if payload[:cache_hits]
    "[#{payload[:cache_hits]} / #{payload[:count]} cache hits]"
  else
    "[#{payload[:count]} times]"
  end
end