text: from __future__ import unicode_literals
  
  from django.core.cache import caches
  
  from ...settings import STATE_CACHE_ALIAS
  
  
  class CacheStateHandler(object):
      """
      State handlers that relies on cache to store and retrieve the current
      checksum of a definition."
      """
  
      def __init__(self):
          self.cache = caches[STATE_CACHE_ALIAS]
  
      def get_cache_key(self, definition_pk):
          return "mutant-%s" % definition_pk
  
      def get_checksum(self, definition_pk):
          cache_key = self.get_cache_key(definition_pk)
          return self.cache.get(cache_key)
  
      def set_checksum(self, definition_pk, checksum):
          cache_key = self.get_cache_key(definition_pk)
          return self.cache.set(cache_key, checksum)
  
      def clear_checksum(self, definition_pk):
          cache_key = self.get_cache_key(definition_pk)
          return self.cache.delete(cache_key)
  