def get_streamblock_handle_list():
    logger.debug("get_streamblock_handle_list : ")

    sb_handle_list = []
    if not CObjectRefStore.Exists(OBJ_KEY):
        logger.warn("DiffServCfgRampCommand was not called. " + "Using default threshold values.")
    else:
        tmp_dict = CObjectRefStore.Get(OBJ_KEY)
        logger.debug("  tmp_dict: " + str(tmp_dict))
        dict_keys = tmp_dict.keys()
        logger.debug("  dict_keys: " + str(dict_keys))

        # convert keys to handles
        sb_list = tag_utils.get_tagged_objects_from_string_names(dict_keys)
        for sb in sb_list:
            sb_handle_list.append(sb.GetObjectHandle())
        logger.debug("  sb_handle_list: " + str(sb_handle_list))

    return sb_handle_list