code: def set_collection(self, service_name, collection_name, to_cache):
          
          self.services.setdefault(service_name, {})
          self.services[service_name].setdefault('collections', {})
          self.services[service_name]['collections'].setdefault(collection_name, {})
          options = self.services[service_name]['collections'][collection_name]
          classpath = self.build_classpath(to_cache.__bases__[0])
  
          if classpath == 'kotocore.collections.Collection':
              classpath = 'default'
  
          options[classpath] = to_cache
docs: Sets a collection class within the cache.
  
          :param service_name: The service a given ``Collection`` talks to. Ex.
              ``sqs``, ``sns``, ``dynamodb``, etc.
          :type service_name: string
  
          :param collection_name: The name of the ``Collection``. Ex.
              ``QueueCollection``, ``NotificationCollection``,
              ``TableCollection``, etc.
          :type collection_name: string
  
          :param to_cache: The class to be cached for the service.
          :type to_cache: class