@Override
    public void checkNamespacePluginRel(final String namespaceId, final String pluginName) {
        PluginDO pluginDO = pluginMapper.selectByName(pluginName);
        NamespacePluginVO namespacePluginRelation = namespacePluginRelMapper.selectByPluginIdAndNamespaceId(pluginDO.getId(), namespaceId);
        if (Objects.isNull(namespacePluginRelation)) {
            String errorMsg = String.format("%s plugin not enabled for current namespace or plugin not exist for namespaceId: %s", pluginName, namespaceId);
            throw new IllegalArgumentException(errorMsg);
        }
    }
Register uri string.

@param selectorName the selector name
@param uriList      the uri list
@param namespaceId  the namespace id
@return the string
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/register/AbstractShenyuClientRegisterServiceImpl.java