private SelectorData buildSelectorData(final SelectorDO selectorDO) {
        // find conditions
        List<ConditionData> conditionDataList = ConditionTransfer.INSTANCE.mapToSelectorDOS(
                selectorConditionMapper.selectByQuery(new SelectorConditionQuery(selectorDO.getId())));
        PluginDO pluginDO = pluginMapper.selectById(selectorDO.getPluginId());
        if (Objects.isNull(pluginDO)) {
            return null;
        }
        return SelectorDO.transFrom(selectorDO, pluginDO.getName(), conditionDataList);
    }
the plugin delete, synchronously delete selectors.

@param event event
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/SelectorServiceImpl.java