code: def refresh_role(self, role, file_hierarchy):
          
          if role not in self.cache:
              self.cache[role] = {}
          was_change = self._refresh_hierarchy_recursive(self.cache[role], file_hierarchy)
          if was_change:
              cf = open(self.cache_file, 'w')
              yaml.dump(self.cache, cf, Dumper=Dumper)
              cf.close()
docs: Checks and refreshes (if needed) all assistants with given role.
  
          Args:
              role: role of assistants to refresh
              file_hierarchy: hierarchy as returned by devassistant.yaml_assistant_loader.\
                              YamlAssistantLoader.get_assistants_file_hierarchy