@Override
    public void unSubscribe(final MetaData metaData) {
        Optional.ofNullable(handlerMap.get(metaData.getRpcType()))
                .ifPresent(handler -> {
                    LOG.info("unSubscribe metaData: {}", JsonUtils.toJson(metaData));
                    handler.remove(metaData);
                });
    }
Instantiates a new Common meta data subscriber.

@param metaDataHandlerList the plugin data handler list
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/cache/CommonMetaDataSubscriber.java