@Override
    public void handle(final MetaData metaData) {
        MetaData exist = META_DATA.get(metaData.getPath());
        if (Objects.isNull(exist) || !isInitialized(metaData)) {
            // The first initialization
            initReference(metaData);
        } else {
            // There are updates, which only support the update of four properties of serviceName rpcExt parameterTypes methodName,
            // because these four properties will affect the call of Dubbo;
            if (!Objects.equals(metaData.getServiceName(), exist.getServiceName())
                    || !Objects.equals(metaData.getRpcExt(), exist.getRpcExt())
                    || !Objects.equals(metaData.getParameterTypes(), exist.getParameterTypes())
                    || !Objects.equals(metaData.getMethodName(), exist.getMethodName())) {
                updateReference(metaData);
            }
        }
        META_DATA.put(metaData.getPath(), metaData);
    }
The common dubbo meta data handler.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-dubbo/shenyu-plugin-dubbo-common/src/main/java/org/apache/shenyu/plugin/dubbo/common/handler/AbstractDubboMetaDataHandler.java