Method: ActionDispatch::ServerTiming::Subscriber#ensure_subscribed

Defined in:
actionpack/lib/action_dispatch/middleware/server_timing.rb

#ensure_subscribed ⇒ Object 



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# File 'actionpack/lib/action_dispatch/middleware/server_timing.rb', line 32

def ensure_subscribed
  @mutex.synchronize do
    # Subscribe to all events, except those beginning with "!" Ideally we would be
    # more selective of what is being measured
    @subscriber ||= ActiveSupport::Notifications.subscribe(/\A[^!]/, self)
  end
end