new_contents: # -*- coding: utf-8 -*-
  
  class CircuitBeaker(object):
  
      def report_success(self, group_key, command_key):
          pass
  
      def report_reject(self, group_key, command_key):
          pass
  
      def report_timeout(self, group_key, command_key):
          pass
  
      def report_failure(self, group_key, command_key):
          pass
  
      def is_allow_request(self, group_key, command_key):
          return True
  
      def is_open(self):
          return False
  
      def is_closed(self):
          return True
  
      def is_half_closed(self):
          return True
  
      def is_half_open(self):
          return self.is_half_closed()
  
subject: Define CircuitBeaker.