code: def get_containers(self, container_class):
      
      with self._store_lock:
        return self.store.get(container_class.CONTAINER_TYPE, [])
docs: Thread-safe method to retrieve data from the state's store.
  
      Args:
        container_class: AttributeContainer class used to filter data.
  
      Returns:
        A list of AttributeContainer objects of matching CONTAINER_TYPE.