text: 
  
  class FailedUrlsHandler(object):
  
      FAILED_URL_LOGGER_ENABLED = True
      LOG_MISSED_URLS = False
      MAX_LOGGED_URLS = 100
  
      def __init__(self):
          self.failed_urls_count = 0
          self.failed_urls_list = []
          self.errback_free = True
  
      def log_failure(self, failure):
          if FailedUrlsHandler.FAILED_URL_LOGGER_ENABLED:
              self.failed_urls_count += 1
              if FailedUrlsHandler.LOG_MISSED_URLS and len(self.failed_urls_list) < FailedUrlsHandler.MAX_LOGGED_URLS:
                  request = failure.request
                  self.failed_urls_list.append(request.url)
  
      def get_url_count(self):
          return self.failed_urls_count
  
      def get_url_list(self):
          return self.failed_urls_list
  
      def disable_errback(self):
          self.errback_free = False
  
      def enabled(self):
          return self.errback_free
  
  
  