public ShenyuLoaderService(final ShenyuWebHandler webHandler, final CommonPluginDataSubscriber subscriber, final ShenyuConfig shenyuConfig) {        // Information subscription for plugin information        this.subscriber = subscriber;        // The WebHandler encapsulated by Shenyu contains all the plugin logic        this.webHandler = webHandler;        // configuration information        this.shenyuConfig = shenyuConfig;        // The configuration information of the extension plugin, such as path, whether it is enabled, how many threads are enabled to process, and the frequency of loading checks        ExtPlugin config = shenyuConfig.getExtPlugin();        // If enabled, create a scheduled task to check and load        if (config.getEnabled()) {            // Create a scheduled task with a specified thread name            ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(config.getThreads(), ShenyuThreadFactory.create("plugin-ext-loader", true));            // Create a task to be executed at a fixed frequency, with a default time of 30 seconds and execution every 300 seconds            executor.scheduleAtFixedRate(() -> loadExtOrUploadPlugins(null), config.getScheduleDelay(), config.getScheduleTime(), TimeUnit.SECONDS);        }    }    

   public void loadExtOrUploadPlugins(final PluginData uploadedJarResource) {        try {            List<ShenyuLoaderResult> plugins = new ArrayList<>();            // Obtain the holding object of ShenyuPluginClassloader            ShenyuPluginClassloaderHolder singleton = ShenyuPluginClassloaderHolder.getSingleton();            if (Objects.isNull(uploadedJarResource)) {                // If the parameter is empty, load all jar packages from the extended directory                // PluginJar: Data containing the ShenyuPlugin interface and PluginDataHandler interface                List<PluginJarParser.PluginJar> uploadPluginJars = ShenyuExtPathPluginJarLoader.loadExtendPlugins(shenyuConfig.getExtPlugin().getPath());                // Traverse all pending plugins                for (PluginJarParser.PluginJar extPath : uploadPluginJars) {                    LOG.info("shenyu extPlugin find new {} to load", extPath.getAbsolutePath());                    // Use the loader of the extension plugin to load the specified plugin, facilitating subsequent loading and unloading                    ShenyuPluginClassLoader extPathClassLoader = singleton.createPluginClassLoader(extPath);                    // Using ShenyuPluginClassLoader for loading                    // The main logic is to determine whether to implement ShenyuPlugin interface, PluginDataHandler interface, or identify annotations such as @ Component \ @ Service. If so, register as SpringBean                    // Construct ShenyuLoaderResult object                    plugins.addAll(extPathClassLoader.loadUploadedJarPlugins());                }            } else {                // Load the specified jar, with the same logic as loading all                PluginJarParser.PluginJar pluginJar = PluginJarParser.parseJar(Base64.getDecoder().decode(uploadedJarResource.getPluginJar()));                LOG.info("shenyu upload plugin jar find new {} to load", pluginJar.getJarKey());                ShenyuPluginClassLoader uploadPluginClassLoader = singleton.createPluginClassLoader(pluginJar);                plugins.addAll(uploadPluginClassLoader.loadUploadedJarPlugins());            }            // Add the extended plugins to the plugin list of ShenyuWebHandler, and subsequent requests will go through the added plugin content            loaderPlugins(plugins);        } catch (Exception e) {            LOG.error("shenyu plugins load has error ", e);        }    }

public List<ShenyuLoaderResult> loadUploadedJarPlugins() {        List<ShenyuLoaderResult> results = new ArrayList<>();        // All class mapping relationships        Set<String> names = pluginJar.getClazzMap().keySet();        // Traverse all classes        names.forEach(className -> {            Object instance;            try {                // Try creating objects and, if possible, add them to the Spring container                instance = getOrCreateSpringBean(className);                if (Objects.nonNull(instance)) {                    // Building the ShenyuLoaderResult object                    results.add(buildResult(instance));                    LOG.info("The class successfully loaded into a upload-Jar-plugin {} is registered as a spring bean", className);                }            } catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {                LOG.warn("Registering upload-Jar-plugins succeeds spring bean fails:{}", className, e);            }        });        return results;    }

    private ShenyuLoaderResult buildResult(final Object instance) {        ShenyuLoaderResult result = new ShenyuLoaderResult();        // Does the created object implement ShenyuPlugin        if (instance instanceof ShenyuPlugin) {            result.setShenyuPlugin((ShenyuPlugin) instance);            // Does the created object implement PluginDataHandler        } else if (instance instanceof PluginDataHandler) {            result.setPluginDataHandler((PluginDataHandler) instance);        }        return result;    }

    private <T> T getOrCreateSpringBean(final String className) throws ClassNotFoundException, IllegalAccessException, InstantiationException {        // Confirm if it has been registered. If so, do not process it and return directly        if (SpringBeanUtils.getInstance().existBean(className)) {            return SpringBeanUtils.getInstance().getBeanByClassName(className);        }        lock.lock();        try {            // Double check,            T inst = SpringBeanUtils.getInstance().getBeanByClassName(className);            if (Objects.isNull(inst)) {                // Using ShenyuPluginClassLoader to load classes                Class<?> clazz = Class.forName(className, false, this);                //Exclude ShenyuPlugin subclass and PluginDataHandler subclass                // without adding @Component @Service annotation                // Confirm if it is a subclass of ShenyuPlugin or PluginDataHandler                boolean next = ShenyuPlugin.class.isAssignableFrom(clazz)                        || PluginDataHandler.class.isAssignableFrom(clazz);                if (!next) {                    // If not, confirm if @ Component and @ Service annotations are identified                    Annotation[] annotations = clazz.getAnnotations();                    next = Arrays.stream(annotations).anyMatch(e -> e.annotationType().equals(Component.class)                            || e.annotationType().equals(Service.class));                }                if (next) {                    // If the above content is met, register the bean                    GenericBeanDefinition beanDefinition = new GenericBeanDefinition();                    beanDefinition.setBeanClassName(className);                    beanDefinition.setAutowireCandidate(true);                    beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);                    // Registering beans                    String beanName = SpringBeanUtils.getInstance().registerBean(beanDefinition, this);                    // create object                    inst = SpringBeanUtils.getInstance().getBeanByClassName(beanName);                }            }            return inst;        } finally {            lock.unlock();        }    }

    private void loaderPlugins(final List<ShenyuLoaderResult> results) {        if (CollectionUtils.isEmpty(results)) {            return;        }        // Get all objects that implement the interface ShenyuPlugin        List<ShenyuPlugin> shenyuExtendPlugins = results.stream().map(ShenyuLoaderResult::getShenyuPlugin).filter(Objects::nonNull).collect(Collectors.toList());        // Synchronize updating plugins in webHandler        webHandler.putExtPlugins(shenyuExtendPlugins);        // Get all objects that implement the interface PluginDataHandler        List<PluginDataHandler> handlers = results.stream().map(ShenyuLoaderResult::getPluginDataHandler).filter(Objects::nonNull).collect(Collectors.toList());        // Synchronize updating handlers in subscriber        subscriber.putExtendPluginDataHandler(handlers);
    }

    public void putExtPlugins(final List<ShenyuPlugin> extPlugins) {        if (CollectionUtils.isEmpty(extPlugins)) {            return;        }        // Filter out newly added plugins        final List<ShenyuPlugin> shenyuAddPlugins = extPlugins.stream()                .filter(e -> plugins.stream().noneMatch(plugin -> plugin.named().equals(e.named())))                .collect(Collectors.toList());        // Filter out updated plugins and determine if they have the same name as the old one, then it is an update        final List<ShenyuPlugin> shenyuUpdatePlugins = extPlugins.stream()                .filter(e -> plugins.stream().anyMatch(plugin -> plugin.named().equals(e.named())))                .collect(Collectors.toList());        // If there is no data, skip        if (CollectionUtils.isEmpty(shenyuAddPlugins) && CollectionUtils.isEmpty(shenyuUpdatePlugins)) {            return;        }        // Copy old data        // copy new list        List<ShenyuPlugin> newPluginList = new ArrayList<>(plugins);        // Add new plugin data        // Add extend plugin from pluginData or shenyu ext-lib        this.sourcePlugins.addAll(shenyuAddPlugins);        // Add new data        if (CollectionUtils.isNotEmpty(shenyuAddPlugins)) {            shenyuAddPlugins.forEach(plugin -> LOG.info("shenyu auto add extends plugins:{}", plugin.named()));            newPluginList.addAll(shenyuAddPlugins);        }        // Modify updated data        if (CollectionUtils.isNotEmpty(shenyuUpdatePlugins)) {            shenyuUpdatePlugins.forEach(plugin -> LOG.info("shenyu auto update extends plugins:{}", plugin.named()));            for (ShenyuPlugin updatePlugin : shenyuUpdatePlugins) {                for (int i = 0; i < newPluginList.size(); i++) {                    if (newPluginList.get(i).named().equals(updatePlugin.named())) {                        newPluginList.set(i, updatePlugin);                    }                }                for (int i = 0; i < this.sourcePlugins.size(); i++) {                    if (this.sourcePlugins.get(i).named().equals(updatePlugin.named())) {                        this.sourcePlugins.set(i, updatePlugin);                    }                }            }        }        // REORDER        plugins = sortPlugins(newPluginList);    }

    public void putExtendPluginDataHandler(final List<PluginDataHandler> handlers) {        if (CollectionUtils.isEmpty(handlers)) {            return;        }        // Traverse all data        for (PluginDataHandler handler : handlers) {            String pluginNamed = handler.pluginNamed();            // Update existing PluginDataHandler list            MapUtils.computeIfAbsent(handlerMap, pluginNamed, name -> {                LOG.info("shenyu auto add extends plugin data handler name is :{}", pluginNamed);                return handler;            });        }    }

@RestController@RequestMapping("/order")@ShenyuSpringMvcClient(path = "/order")  // APIpublic class OrderController {    @GetMapping("/findById")    @ShenyuSpringMvcClient(path = "/findById", desc = "Find by id") // method    public OrderDTO findById(@RequestParam("id") final String id) {        return build(id, "hello world findById");    }}

@Retention(RetentionPolicy.RUNTIME)@Target({ElementType.TYPE, ElementType.METHOD})public @interface ShenyuSpringMvcClient {        //path    String path() default "";        //rule name    String ruleName() default "";       //desc info    String desc() default "";
    //is enabled    boolean enabled() default true;        //register MetaData    boolean registerMetaData() default false;}

public class SpringMvcClientBeanPostProcessor implements BeanPostProcessor {    //...    /**     * Constructor instantiation     */    public SpringMvcClientBeanPostProcessor(final PropertiesConfig clientConfig,                                            final ShenyuClientRegisterRepository shenyuClientRegisterRepository) {        // 1. read Properties        Properties props = clientConfig.getProps();        this.appName = props.getProperty(ShenyuClientConstants.APP_NAME);        this.contextPath = props.getProperty(ShenyuClientConstants.CONTEXT_PATH, "");        if (StringUtils.isBlank(appName) && StringUtils.isBlank(contextPath)) {            String errorMsg = "http register param must config the appName or contextPath";            LOG.error(errorMsg);            throw new ShenyuClientIllegalArgumentException(errorMsg);        }        this.isFull = Boolean.parseBoolean(props.getProperty(ShenyuClientConstants.IS_FULL, Boolean.FALSE.toString()));        // 2. add annotation        mappingAnnotation.add(ShenyuSpringMvcClient.class);        mappingAnnotation.add(PostMapping.class);        mappingAnnotation.add(GetMapping.class);        mappingAnnotation.add(DeleteMapping.class);        mappingAnnotation.add(PutMapping.class);        mappingAnnotation.add(RequestMapping.class);        // 3. start register cneter        publisher.start(shenyuClientRegisterRepository);    }        @Override    public Object postProcessAfterInitialization(@NonNull final Object bean, @NonNull final String beanName) throws BeansException {       // override post process                return bean;    }    

    @Override    public Object postProcessAfterInitialization(@NonNull final Object bean, @NonNull final String beanName) throws BeansException {        // 1. If the all service is registered or is not a Controller class, it is not handled        if (Boolean.TRUE.equals(isFull) || !hasAnnotation(bean.getClass(), Controller.class)) {            return bean;        }        // 2. Read the annotations on the class ShenyuSpringMvcClient        final ShenyuSpringMvcClient beanShenyuClient = AnnotationUtils.findAnnotation(bean.getClass(), ShenyuSpringMvcClient.class);        // 2.1 build  superPath        final String superPath = buildApiSuperPath(bean.getClass());        // 2.2 whether to register the entire class method        if (Objects.nonNull(beanShenyuClient) && superPath.contains("*")) {            // build the metadata object and register it with shenyu-admin            publisher.publishEvent(buildMetaDataDTO(beanShenyuClient, pathJoin(contextPath, superPath)));            return bean;        }        // 3. read all methods        final Method[] methods = ReflectionUtils.getUniqueDeclaredMethods(bean.getClass());        for (Method method : methods) {            // 3.1 read the annotations on the method ShenyuSpringMvcClient            ShenyuSpringMvcClient methodShenyuClient = AnnotationUtils.findAnnotation(method, ShenyuSpringMvcClient.class);            // If there is no annotation on the method, use the annotation on the class            methodShenyuClient = Objects.isNull(methodShenyuClient) ? beanShenyuClient : methodShenyuClient;            if (Objects.nonNull(methodShenyuClient)) {               // 3.2 Build path information, build metadata objects, register with shenyu-admin                publisher.publishEvent(buildMetaDataDTO(methodShenyuClient, buildApiPath(method, superPath)));            }        }                return bean;    }

    private String buildApiSuperPath(@NonNull final Class<?> method) {        // First take the path property from the annotation ShenyuSpringMvcClient on the class        ShenyuSpringMvcClient shenyuSpringMvcClient = AnnotationUtils.findAnnotation(method, ShenyuSpringMvcClient.class);        if (Objects.nonNull(shenyuSpringMvcClient) && StringUtils.isNotBlank(shenyuSpringMvcClient.path())) {            return shenyuSpringMvcClient.path();        }        // Take the path information from the RequestMapping annotation of the current class        RequestMapping requestMapping = AnnotationUtils.findAnnotation(method, RequestMapping.class);        if (Objects.nonNull(requestMapping) && ArrayUtils.isNotEmpty(requestMapping.path()) && StringUtils.isNotBlank(requestMapping.path()[0])) {            return requestMapping.path()[0];        }        return "";    }

    private String buildApiPath(@NonNull final Method method, @NonNull final String superPath) {        // 1. Read the annotation ShenyuSpringMvcClient on the method        ShenyuSpringMvcClient shenyuSpringMvcClient = AnnotationUtils.findAnnotation(method, ShenyuSpringMvcClient.class);        // 1.1 If path exists, build        if (Objects.nonNull(shenyuSpringMvcClient) && StringUtils.isNotBlank(shenyuSpringMvcClient.path())) {            //1.2  path = contextPath+superPath+methodPath            return pathJoin(contextPath, superPath, shenyuSpringMvcClient.path());        }        // 2. Get path information from other annotations on the method        final String path = getPathByMethod(method);        if (StringUtils.isNotBlank(path)) {             // 2.1 path = contextPath+superPath+methodPath            return pathJoin(contextPath, superPath, path);        }        return pathJoin(contextPath, superPath);    }

    private String getPathByMethod(@NonNull final Method method) {        // Iterate through interface annotations to get path information        for (Class<? extends Annotation> mapping : mappingAnnotation) {            final String pathByAnnotation = getPathByAnnotation(AnnotationUtils.findAnnotation(method, mapping), pathAttributeNames);            if (StringUtils.isNotBlank(pathByAnnotation)) {                return pathByAnnotation;            }        }        return null;    }

 private MetaDataRegisterDTO buildMetaDataDTO(@NonNull final ShenyuSpringMvcClient shenyuSpringMvcClient, final String path) {        return MetaDataRegisterDTO.builder()                .contextPath(contextPath) // contextPath                .appName(appName) // appName                .path(path) // Registered path, used when gateway rules match                .pathDesc(shenyuSpringMvcClient.desc()) // desc info                .rpcType(RpcTypeEnum.HTTP.getName()) // divide plugin, http type when default                .enabled(shenyuSpringMvcClient.enabled()) // is enabled?                .ruleName(StringUtils.defaultIfBlank(shenyuSpringMvcClient.ruleName(), path))//rule name                .registerMetaData(shenyuSpringMvcClient.registerMetaData()) // whether to register metadata information                .build();    }

public class ContextRegisterListener implements ApplicationListener<ContextRefreshedEvent>, BeanFactoryAware {    //......        /**     * Constructor instantiation     */    public ContextRegisterListener(final PropertiesConfig clientConfig) {        // read Properties        final Properties props = clientConfig.getProps();        this.isFull = Boolean.parseBoolean(props.getProperty(ShenyuClientConstants.IS_FULL, Boolean.FALSE.toString()));        this.contextPath = props.getProperty(ShenyuClientConstants.CONTEXT_PATH);        if (Boolean.TRUE.equals(isFull)) {            if (StringUtils.isBlank(contextPath)) {                final String errorMsg = "http register param must config the contextPath";                LOG.error(errorMsg);                throw new ShenyuClientIllegalArgumentException(errorMsg);            }        }        this.port = Integer.parseInt(Optional.ofNullable(props.getProperty(ShenyuClientConstants.PORT)).orElseGet(() -> "-1"));        this.appName = props.getProperty(ShenyuClientConstants.APP_NAME);        this.protocol = props.getProperty(ShenyuClientConstants.PROTOCOL, ShenyuClientConstants.HTTP);        this.host = props.getProperty(ShenyuClientConstants.HOST);    }
    @Override    public void setBeanFactory(final BeanFactory beanFactory) throws BeansException {        this.beanFactory = beanFactory;    }
    // Execute application events    @Override    public void onApplicationEvent(@NonNull final ContextRefreshedEvent contextRefreshedEvent) {          // The method is guaranteed to be executed once        if (!registered.compareAndSet(false, true)) {            return;        }        // 1. If you are registering for the entire service        if (Boolean.TRUE.equals(isFull)) {            // Build metadata and register            publisher.publishEvent(buildMetaDataDTO());        }        try {            // get port            final int mergedPort = port <= 0 ? PortUtils.findPort(beanFactory) : port;            // 2. Constructing URI data and registering            publisher.publishEvent(buildURIRegisterDTO(mergedPort));        } catch (ShenyuException e) {            throw new ShenyuException(e.getMessage() + "please config ${shenyu.client.http.props.port} in xml/yml !");        }    }
    // build URI data    private URIRegisterDTO buildURIRegisterDTO(final int port) {        return URIRegisterDTO.builder()            .contextPath(this.contextPath) // contextPath            .appName(appName) // appName            .protocol(protocol) // protocol            .host(IpUtils.isCompleteHost(this.host) ? this.host : IpUtils.getHost(this.host)) //host            .port(port) // port            .rpcType(RpcTypeEnum.HTTP.getName()) // divide plugin, default registration http type            .build();    }
    // build MetaData    private MetaDataRegisterDTO buildMetaDataDTO() {        return MetaDataRegisterDTO.builder()            .contextPath(contextPath)            .appName(appName)            .path(contextPath)            .rpcType(RpcTypeEnum.HTTP.getName())            .enabled(true)            .ruleName(contextPath)            .build();    }}

   @Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        String selectorHandler = selectorHandler(dto);        String selectorId = selectorService.registerDefault(dto, PluginNameAdapter.rpcTypeAdapter(rpcType()), selectorHandler);        //2. register rule        String ruleHandler = ruleHandler();        RuleDTO ruleDTO = buildRpcDefaultRuleDTO(selectorId, dto, ruleHandler);        ruleService.registerDefault(ruleDTO);        //3. register metadat        registerMetadata(dto);        //4. register ContextPath        String contextPath = dto.getContextPath();        if (StringUtils.isNotEmpty(contextPath)) {            registerContextPath(dto);        }        return ShenyuResultMessage.SUCCESS;    }

    @Override    public String registerDefault(final MetaDataRegisterDTO dto, final String pluginName, final String selectorHandler) {        // build contextPath        String contextPath = ContextPathUtils.buildContextPath(dto.getContextPath(), dto.getAppName());        // Find if selector information exists by name        SelectorDO selectorDO = findByNameAndPluginName(contextPath, pluginName);        if (Objects.isNull(selectorDO)) {            // Create a default selector message if it does not exist            return registerSelector(contextPath, pluginName, selectorHandler);        }        return selectorDO.getId();    }

   //register selector   private String registerSelector(final String contextPath, final String pluginName, final String selectorHandler) {        // build selector         SelectorDTO selectorDTO = buildSelectorDTO(contextPath, pluginMapper.selectByName(pluginName).getId());        selectorDTO.setHandle(selectorHandler);        //register default Selector        return registerDefault(selectorDTO);    }     //build    private SelectorDTO buildSelectorDTO(final String contextPath, final String pluginId) {        //build default        SelectorDTO selectorDTO = buildDefaultSelectorDTO(contextPath);        selectorDTO.setPluginId(pluginId);         //build the conditional properties of the default selector        selectorDTO.setSelectorConditions(buildDefaultSelectorConditionDTO(contextPath));        return selectorDTO;    }

private List<SelectorConditionDTO> buildDefaultSelectorConditionDTO(final String contextPath) {    SelectorConditionDTO selectorConditionDTO = new SelectorConditionDTO();    selectorConditionDTO.setParamType(ParamTypeEnum.URI.getName()); // default URI    selectorConditionDTO.setParamName("/");    selectorConditionDTO.setOperator(OperatorEnum.MATCH.getAlias()); // default match    selectorConditionDTO.setParamValue(contextPath + AdminConstants.URI_SUFFIX); // default /contextPath/**    return Collections.singletonList(selectorConditionDTO);}

@Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        //......                //2. register rule        // default rule handle        String ruleHandler = ruleHandler();        // build default rule        RuleDTO ruleDTO = buildRpcDefaultRuleDTO(selectorId, dto, ruleHandler);        // register rule        ruleService.registerDefault(ruleDTO);                //3. register Metadata        //......                //4. register ContextPath        //......                return ShenyuResultMessage.SUCCESS;    }

    @Override    protected String ruleHandler() {        // default rule handle        return new DivideRuleHandle().toJson();    }

public class DivideRuleHandle implements RuleHandle {
    /**     * load balance: default RANDOM     */    private String loadBalance = LoadBalanceEnum.RANDOM.getName();
    /**     * retry strategy: default CURRENT     */    private String retryStrategy = RetryEnum.CURRENT.getName();
    /**     * retry: default 3     */    private int retry = 3;
    /**     *  retry: default 3000     */    private long timeout = Constants.TIME_OUT;
    /**     *  retry: default  10240 byte     */    private long headerMaxSize = Constants.HEADER_MAX_SIZE;
    /**     *  retry: default 102400 byte     */    private long requestMaxSize = Constants.REQUEST_MAX_SIZE;}

  // build default rule info    private RuleDTO buildRpcDefaultRuleDTO(final String selectorId, final MetaDataRegisterDTO metaDataDTO, final String ruleHandler) {        return buildRuleDTO(selectorId, ruleHandler, metaDataDTO.getRuleName(), metaDataDTO.getPath());    }   //  build default rule info    private RuleDTO buildRuleDTO(final String selectorId, final String ruleHandler, final String ruleName, final String path) {        RuleDTO ruleDTO = RuleDTO.builder()                .selectorId(selectorId) //selector Id                .name(ruleName) //rule Name                .matchMode(MatchModeEnum.AND.getCode()) // default and                .enabled(Boolean.TRUE) // default TRUE                .loged(Boolean.TRUE) //default TRUE                .sort(1) //default 1                .handle(ruleHandler)                .build();        RuleConditionDTO ruleConditionDTO = RuleConditionDTO.builder()                .paramType(ParamTypeEnum.URI.getName()) // default URI                .paramName("/")                .paramValue(path) // path                .build();        if (path.indexOf("*") > 1) {            ruleConditionDTO.setOperator(OperatorEnum.MATCH.getAlias()); //if the path conatins *, default match        } else {            ruleConditionDTO.setOperator(OperatorEnum.EQ.getAlias()); // default =         }        ruleDTO.setRuleConditions(Collections.singletonList(ruleConditionDTO));        return ruleDTO;    }

    @Override    public String registerDefault(final RuleDTO ruleDTO) {        RuleDO exist = ruleMapper.findBySelectorIdAndName(ruleDTO.getSelectorId(), ruleDTO.getName());        if (Objects.nonNull(exist)) {            return "";        }
        RuleDO ruleDO = RuleDO.buildRuleDO(ruleDTO);        List<RuleConditionDTO> ruleConditions = ruleDTO.getRuleConditions();        if (StringUtils.isEmpty(ruleDTO.getId())) {            // insert rule into database             ruleMapper.insertSelective(ruleDO);            //insert rule condition into database             ruleConditions.forEach(ruleConditionDTO -> {                ruleConditionDTO.setRuleId(ruleDO.getId());                           ruleConditionMapper.insertSelective(RuleConditionDO.buildRuleConditionDO(ruleConditionDTO));            });        }        // Publish events to the gateway for data synchronization        publishEvent(ruleDO, ruleConditions);        return ruleDO.getId();    }

   @Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        //......                //2. register rule        //......                //3. register metadata        registerMetadata(dto);                //4. register ContextPath        //......                return ShenyuResultMessage.SUCCESS;    }

    @Override    protected void registerMetadata(final MetaDataRegisterDTO dto) {        if (dto.isRegisterMetaData()) {             MetaDataService metaDataService = getMetaDataService();            MetaDataDO exist = metaDataService.findByPath(dto.getPath());            // save or update MetaData            metaDataService.saveOrUpdateMetaData(exist, dto);        }    }
    @Override    public void saveOrUpdateMetaData(final MetaDataDO exist, final MetaDataRegisterDTO metaDataDTO) {        DataEventTypeEnum eventType;        //  DTO->DO        MetaDataDO metaDataDO = MetaDataTransfer.INSTANCE.mapRegisterDTOToEntity(metaDataDTO);        // insert        if (Objects.isNull(exist)) {            Timestamp currentTime = new Timestamp(System.currentTimeMillis());            metaDataDO.setId(UUIDUtils.getInstance().generateShortUuid());            metaDataDO.setDateCreated(currentTime);            metaDataDO.setDateUpdated(currentTime);            metaDataMapper.insert(metaDataDO);            eventType = DataEventTypeEnum.CREATE;        } else {            // update            metaDataDO.setId(exist.getId());            metaDataMapper.update(metaDataDO);            eventType = DataEventTypeEnum.UPDATE;        }        // publish event to  gateway        eventPublisher.publishEvent(new DataChangedEvent(ConfigGroupEnum.META_DATA, eventType,                Collections.singletonList(MetaDataTransfer.INSTANCE.mapToData(metaDataDO))));    }

   @Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        //......                //2. register rule        //......                //3. register metadata        //......                //4. register ContextPath        String contextPath = dto.getContextPath();        if (StringUtils.isNotEmpty(contextPath)) {            registerContextPath(dto);        }        return ShenyuResultMessage.SUCCESS;    }

    @Override    public void registerContextPath(final MetaDataRegisterDTO dto) {        // set contextPath for selector        String contextPathSelectorId = getSelectorService().registerDefault(dto, PluginEnum.CONTEXT_PATH.getName(), "");        ContextMappingRuleHandle handle = new ContextMappingRuleHandle();        handle.setContextPath(PathUtils.decoratorContextPath(dto.getContextPath()));        // set contextPath for rule        getRuleService().registerDefault(buildContextPathDefaultRuleDTO(contextPathSelectorId, dto, handle.toJson()));    }

    @Override    public String registerURI(final String selectorName, final List<URIRegisterDTO> uriList) {        String result;        String key = key(selectorName);        try {            this.removeFallBack(key);            // register URI            result = this.doRegisterURI(selectorName, uriList);            logger.info("Register success: {},{}", selectorName, uriList);        } catch (Exception ex) {            logger.warn("Register exception: cause:{}", ex.getMessage());            result = "";            // Retry after registration failure            this.addFallback(key, new FallbackHolder(selectorName, uriList));        }        return result;    }

@Override    public String doRegisterURI(final String selectorName, final List<URIRegisterDTO> uriList) {        //check        if (CollectionUtils.isEmpty(uriList)) {            return "";        }        //get selector         SelectorDO selectorDO = selectorService.findByNameAndPluginName(selectorName, PluginNameAdapter.rpcTypeAdapter(rpcType()));        if (Objects.isNull(selectorDO)) {            throw new ShenyuException("doRegister Failed to execute,wait to retry.");        }        // gte valid URI        List<URIRegisterDTO> validUriList = uriList.stream().filter(dto -> Objects.nonNull(dto.getPort()) && StringUtils.isNotBlank(dto.getHost())).collect(Collectors.toList());        // build handle        String handler = buildHandle(validUriList, selectorDO);        if (handler != null) {            selectorDO.setHandle(handler);            SelectorData selectorData = selectorService.buildByName(selectorName, PluginNameAdapter.rpcTypeAdapter(rpcType()));            selectorData.setHandle(handler);            // Update the handle property of the selector to the database            selectorService.updateSelective(selectorDO);            // Send selector update events to the gateway            eventPublisher.publishEvent(new DataChangedEvent(ConfigGroupEnum.SELECTOR, DataEventTypeEnum.UPDATE, Collections.singletonList(selectorData)));        }        return ShenyuResultMessage.SUCCESS;    }

@Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        String pluginName = named();        PluginData pluginData = BaseDataCache.getInstance().obtainPluginData(pluginName);        if (pluginData != null && pluginData.getEnabled()) {            // selector             final Collection<SelectorData> selectors = BaseDataCache.getInstance().obtainSelectorData(pluginName);            if (CollectionUtils.isEmpty(selectors)) {                return handleSelectorIfNull(pluginName, exchange, chain);            }            // match selector            SelectorData selectorData = matchSelector(exchange, selectors);            if (Objects.isNull(selectorData)) {                return handleSelectorIfNull(pluginName, exchange, chain);            }            selectorLog(selectorData, pluginName);            // rule             List<RuleData> rules = BaseDataCache.getInstance().obtainRuleData(selectorData.getId());            if (CollectionUtils.isEmpty(rules)) {                return handleRuleIfNull(pluginName, exchange, chain);            }            // match rule             RuleData rule;            if (selectorData.getType() == SelectorTypeEnum.FULL_FLOW.getCode()) {                //get last                rule = rules.get(rules.size() - 1);            } else {                rule = matchRule(exchange, rules);            }            if (Objects.isNull(rule)) {                return handleRuleIfNull(pluginName, exchange, chain);            }            ruleLog(rule, pluginName);            // execute             return doExecute(exchange, chain, selectorData, rule);        }        return chain.execute(exchange);    }

@Override    protected Mono<Void> doExecute(final ServerWebExchange exchange, final ShenyuPluginChain chain, final SelectorData selector, final RuleData rule) {        // shenyu Context        ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        assert shenyuContext != null;        // Get the handle property of the rule        DivideRuleHandle ruleHandle = DividePluginDataHandler.CACHED_HANDLE.get().obtainHandle(CacheKeyUtils.INST.getKey(rule));        long headerSize = 0;        // check header size        for (List<String> multiHeader : exchange.getRequest().getHeaders().values()) {            for (String value : multiHeader) {                headerSize += value.getBytes(StandardCharsets.UTF_8).length;            }        }        if (headerSize > ruleHandle.getHeaderMaxSize()) {            LOG.error("request header is too large");            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.REQUEST_HEADER_TOO_LARGE, null);            return WebFluxResultUtils.result(exchange, error);        }                // check request size        if (exchange.getRequest().getHeaders().getContentLength() > ruleHandle.getRequestMaxSize()) {            LOG.error("request entity is too large");            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.REQUEST_ENTITY_TOO_LARGE, null);            return WebFluxResultUtils.result(exchange, error);        }        // upstream list        List<Upstream> upstreamList = UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selector.getId());        if (CollectionUtils.isEmpty(upstreamList)) {            LOG.error("divide upstream configuration error： {}", rule);            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL, null);            return WebFluxResultUtils.result(exchange, error);        }        // request ip        String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();        // load balance        Upstream upstream = LoadBalancerFactory.selector(upstreamList, ruleHandle.getLoadBalance(), ip);        if (Objects.isNull(upstream)) {            LOG.error("divide has no upstream");            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL, null);            return WebFluxResultUtils.result(exchange, error);        }        // set url        String domain = upstream.buildDomain();        exchange.getAttributes().put(Constants.HTTP_DOMAIN, domain);        // set timeout        exchange.getAttributes().put(Constants.HTTP_TIME_OUT, ruleHandle.getTimeout());        exchange.getAttributes().put(Constants.HTTP_RETRY, ruleHandle.getRetry());        // set retry         exchange.getAttributes().put(Constants.RETRY_STRATEGY, ruleHandle.getRetryStrategy());        exchange.getAttributes().put(Constants.LOAD_BALANCE, ruleHandle.getLoadBalance());        exchange.getAttributes().put(Constants.DIVIDE_SELECTOR_ID, selector.getId());        return chain.execute(exchange);    }

public abstract class AbstractHttpClientPlugin<R> implements ShenyuPlugin {
    protected static final Logger LOG = LoggerFactory.getLogger(AbstractHttpClientPlugin.class);
    @Override    public final Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        // shenyu Context        final ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        assert shenyuContext != null;        // uri        final URI uri = exchange.getAttribute(Constants.HTTP_URI);        if (Objects.isNull(uri)) {            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.CANNOT_FIND_URL, null);            return WebFluxResultUtils.result(exchange, error);        }        // get time out        final long timeout = (long) Optional.ofNullable(exchange.getAttribute(Constants.HTTP_TIME_OUT)).orElse(3000L);        final Duration duration = Duration.ofMillis(timeout);        // get retry times        final int retryTimes = (int) Optional.ofNullable(exchange.getAttribute(Constants.HTTP_RETRY)).orElse(0);        // get retry strategy        final String retryStrategy = (String) Optional.ofNullable(exchange.getAttribute(Constants.RETRY_STRATEGY)).orElseGet(RetryEnum.CURRENT::getName);        LOG.info("The request urlPath is {}, retryTimes is {}, retryStrategy is {}", uri.toASCIIString(), retryTimes, retryStrategy);        // build header        final HttpHeaders httpHeaders = buildHttpHeaders(exchange);        // do request        final Mono<R> response = doRequest(exchange, exchange.getRequest().getMethodValue(), uri, httpHeaders, exchange.getRequest().getBody())                .timeout(duration, Mono.error(new TimeoutException("Response took longer than timeout: " + duration)))                .doOnError(e -> LOG.error(e.getMessage(), e));                // Retry Policy CURRENT, retries the current service.        if (RetryEnum.CURRENT.getName().equals(retryStrategy)) {            //old version of DividePlugin and SpringCloudPlugin will run on this            return response.retryWhen(Retry.anyOf(TimeoutException.class, ConnectTimeoutException.class, ReadTimeoutException.class, IllegalStateException.class)                    .retryMax(retryTimes)                    .backoff(Backoff.exponential(Duration.ofMillis(200), Duration.ofSeconds(20), 2, true)))                    .onErrorMap(TimeoutException.class, th -> new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th))                    .flatMap((Function<Object, Mono<? extends Void>>) o -> chain.execute(exchange));        }                // Retry for other services        // Exclude services that have already been called        final Set<URI> exclude = Sets.newHashSet(uri);        // resend        return resend(response, exchange, duration, httpHeaders, exclude, retryTimes)                .onErrorMap(TimeoutException.class, th -> new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th))                .flatMap((Function<Object, Mono<? extends Void>>) o -> chain.execute(exchange));    }
    private Mono<R> resend(final Mono<R> clientResponse,                           final ServerWebExchange exchange,                           final Duration duration,                           final HttpHeaders httpHeaders,                           final Set<URI> exclude,                           final int retryTimes) {        Mono<R> result = clientResponse;        // Retry according to the specified number of retries        for (int i = 0; i < retryTimes; i++) {            result = resend(result, exchange, duration, httpHeaders, exclude);        }        return result;    }
    private Mono<R> resend(final Mono<R> response,                           final ServerWebExchange exchange,                           final Duration duration,                           final HttpHeaders httpHeaders,                           final Set<URI> exclude) {        return response.onErrorResume(th -> {            final String selectorId = exchange.getAttribute(Constants.DIVIDE_SELECTOR_ID);            final String loadBalance = exchange.getAttribute(Constants.LOAD_BALANCE);            //Check available services            final List<Upstream> upstreamList = UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selectorId)                    .stream().filter(data -> {                        final String trimUri = data.getUrl().trim();                        for (URI needToExclude : exclude) {                            // exclude already called                            if ((needToExclude.getHost() + ":" + needToExclude.getPort()).equals(trimUri)) {                                return false;                            }                        }                        return true;                    }).collect(Collectors.toList());            if (CollectionUtils.isEmpty(upstreamList)) {                // no need to retry anymore                return Mono.error(new ShenyuException(ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER.getMsg()));            }            // requets ip            final String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();            // Load Balance            final Upstream upstream = LoadBalancerFactory.selector(upstreamList, loadBalance, ip);            if (Objects.isNull(upstream)) {                // no need to retry anymore                return Mono.error(new ShenyuException(ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER.getMsg()));            }            final URI newUri = RequestUrlUtils.buildRequestUri(exchange, upstream.buildDomain());            // Exclude uri that has already been called            exclude.add(newUri);             // Make another call            return doRequest(exchange, exchange.getRequest().getMethodValue(), newUri, httpHeaders, exchange.getRequest().getBody())                    .timeout(duration, Mono.error(new TimeoutException("Response took longer than timeout: " + duration)))                    .doOnError(e -> LOG.error(e.getMessage(), e));        });    }
    //......}

@Override    protected Mono<ClientResponse> doRequest(final ServerWebExchange exchange, final String httpMethod, final URI uri,                                             final HttpHeaders httpHeaders, final Flux<DataBuffer> body) {        return webClient.method(HttpMethod.valueOf(httpMethod)).uri(uri) // uri                .headers(headers -> headers.addAll(httpHeaders)) // header                .body(BodyInserters.fromDataBuffers(body))                .exchange() // request                .doOnSuccess(res -> {                    if (res.statusCode().is2xxSuccessful()) { // success                        exchange.getAttributes().put(Constants.CLIENT_RESPONSE_RESULT_TYPE, ResultEnum.SUCCESS.getName());                    } else { // error                        exchange.getAttributes().put(Constants.CLIENT_RESPONSE_RESULT_TYPE, ResultEnum.ERROR.getName());                    }                    exchange.getResponse().setStatusCode(res.statusCode());                    exchange.getAttributes().put(Constants.CLIENT_RESPONSE_ATTR, res);                });    }

    @Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        assert shenyuContext != null;        // Processing results according to rpc type        return writerMap.get(shenyuContext.getRpcType()).writeWith(exchange, chain);    }

    @Override    public Mono<Void> writeWith(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        return chain.execute(exchange).then(Mono.defer(() -> {            // get response            ServerHttpResponse response = exchange.getResponse();            ClientResponse clientResponse = exchange.getAttribute(Constants.CLIENT_RESPONSE_ATTR);            if (Objects.isNull(clientResponse)) {                Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.SERVICE_RESULT_ERROR, null);                return WebFluxResultUtils.result(exchange, error);            }            //cookies and headers            response.getCookies().putAll(clientResponse.cookies());            response.getHeaders().putAll(clientResponse.headers().asHttpHeaders());            // image, pdf or stream does not do format processing.            // Handling special response types            if (clientResponse.headers().contentType().isPresent()) {                final String media = clientResponse.headers().contentType().get().toString().toLowerCase();                if (media.matches(COMMON_BIN_MEDIA_TYPE_REGEX)) {                    return response.writeWith(clientResponse.body(BodyExtractors.toDataBuffers()))                            .doOnCancel(() -> clean(exchange));                }            }            // Handling general response types            clientResponse = ResponseUtils.buildClientResponse(response, clientResponse.body(BodyExtractors.toDataBuffers()));            return clientResponse.bodyToMono(byte[].class)                    .flatMap(originData -> WebFluxResultUtils.result(exchange, originData))                    .doOnCancel(() -> clean(exchange));        }));    }

/** * DubboTestServiceImpl. */@Service("dubboTestService")public class DubboTestServiceImpl implements DubboTestService {        @Override    @ShenyuDubboClient(path = "/findById", desc = "Query by Id")    public DubboTest findById(final String id) {        return new DubboTest(id, "hello world shenyu Apache, findById");    }
    //......}

// dubbo sevice@Service("dubboTestService")public class DubboTestServiceImpl implements DubboTestService {        @Override    @ShenyuDubboClient(path = "/findById", desc = "Query by Id") // need to be registered method    public DubboTest findById(final String id) {        return new DubboTest(id, "hello world shenyu Apache, findById");    }
    //......}

/** * Works on classes and methods */@Retention(RetentionPolicy.RUNTIME)@Target({ElementType.TYPE, ElementType.METHOD})@Inheritedpublic @interface ShenyuDubboClient {        //path    String path();        //rule name    String ruleName() default "";       //desc    String desc() default "";
    //enabled    boolean enabled() default true;}

public class ApacheDubboServiceBeanListener implements ApplicationListener<ContextRefreshedEvent> {
    // ......
    //Constructor    public ApacheDubboServiceBeanListener(final PropertiesConfig clientConfig, final ShenyuClientRegisterRepository shenyuClientRegisterRepository) {        //1.Read property configuration        Properties props = clientConfig.getProps();        String contextPath = props.getProperty(ShenyuClientConstants.CONTEXT_PATH);        String appName = props.getProperty(ShenyuClientConstants.APP_NAME);        if (StringUtils.isBlank(contextPath)) {            throw new ShenyuClientIllegalArgumentException("apache dubbo client must config the contextPath or appName");        }        this.contextPath = contextPath;        this.appName = appName;        this.host = props.getProperty(ShenyuClientConstants.HOST);        this.port = props.getProperty(ShenyuClientConstants.PORT);        //2.Start the thread pool        executorService = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("shenyu-apache-dubbo-client-thread-pool-%d").build());        //3.Start the registry for registering with `shenyu-admin`        publisher.start(shenyuClientRegisterRepository);    }
    /**     * Context refresh event, execute method logic     */    @Override    public void onApplicationEvent(final ContextRefreshedEvent contextRefreshedEvent) {        //......    }

    @Override    public void onApplicationEvent(final ContextRefreshedEvent contextRefreshedEvent) {        //read ServiceBean        Map<String, ServiceBean> serviceBean = contextRefreshedEvent.getApplicationContext().getBeansOfType(ServiceBean.class);        if (serviceBean.isEmpty()) {            return;        }        //The method is guaranteed to be executed only once        if (!registered.compareAndSet(false, true)) {            return;        }        //handle metadata         for (Map.Entry<String, ServiceBean> entry : serviceBean.entrySet()) {            handler(entry.getValue());        }        //handle URI        serviceBean.values().stream().findFirst().ifPresent(bean -> {            publisher.publishEvent(buildURIRegisterDTO(bean));        });    }

    private void handler(final ServiceBean<?> serviceBean) {        //get proxy        Object refProxy = serviceBean.getRef();        //get class        Class<?> clazz = refProxy.getClass();        if (AopUtils.isAopProxy(refProxy)) {            clazz = AopUtils.getTargetClass(refProxy);        }        //all methods        Method[] methods = ReflectionUtils.getUniqueDeclaredMethods(clazz);        for (Method method : methods) {            //read ShenyuDubboClient annotation            ShenyuDubboClient shenyuDubboClient = method.getAnnotation(ShenyuDubboClient.class);            if (Objects.nonNull(shenyuDubboClient)) {                //build meatdata and registry                publisher.publishEvent(buildMetaDataDTO(serviceBean, shenyuDubboClient, method));            }        }    }

    private MetaDataRegisterDTO buildMetaDataDTO(final ServiceBean<?> serviceBean, final ShenyuDubboClient shenyuDubboClient, final Method method) {        //app name        String appName = buildAppName(serviceBean);        //path        String path = contextPath + shenyuDubboClient.path();        //desc        String desc = shenyuDubboClient.desc();        //service name        String serviceName = serviceBean.getInterface();        //rule name        String configRuleName = shenyuDubboClient.ruleName();        String ruleName = ("".equals(configRuleName)) ? path : configRuleName;        //method name         String methodName = method.getName();        //parameter Types        Class<?>[] parameterTypesClazz = method.getParameterTypes();        String parameterTypes = Arrays.stream(parameterTypesClazz).map(Class::getName).collect(Collectors.joining(","));        return MetaDataRegisterDTO.builder()                .appName(appName)                .serviceName(serviceName)                .methodName(methodName)                .contextPath(contextPath)                .host(buildHost())                .port(buildPort(serviceBean))                .path(path)                .ruleName(ruleName)                .pathDesc(desc)                .parameterTypes(parameterTypes)                .rpcExt(buildRpcExt(serviceBean)) //dubbo ext                .rpcType(RpcTypeEnum.DUBBO.getName())                .enabled(shenyuDubboClient.enabled())                .build();    }

private URIRegisterDTO buildURIRegisterDTO(final ServiceBean serviceBean) {        return URIRegisterDTO.builder()                .contextPath(this.contextPath) //context path                .appName(buildAppName(serviceBean))//app name                .rpcType(RpcTypeEnum.DUBBO.getName())//dubbo                .host(buildHost()) //host                .port(buildPort(serviceBean))//port                .build(); }

//To the registration center, post registration events   publisher.publishEvent();

   @Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        String selectorHandler = selectorHandler(dto);        String selectorId = selectorService.registerDefault(dto, PluginNameAdapter.rpcTypeAdapter(rpcType()), selectorHandler);        //2. register rule        String ruleHandler = ruleHandler();        RuleDTO ruleDTO = buildRpcDefaultRuleDTO(selectorId, dto, ruleHandler);        ruleService.registerDefault(ruleDTO);        //3. register metadata        registerMetadata(dto);        //4. register contextPath        String contextPath = dto.getContextPath();        if (StringUtils.isNotEmpty(contextPath)) {            registerContextPath(dto);        }        return ShenyuResultMessage.SUCCESS;    }

    @Override    public String registerDefault(final MetaDataRegisterDTO dto, final String pluginName, final String selectorHandler) {        // build contextPath        String contextPath = ContextPathUtils.buildContextPath(dto.getContextPath(), dto.getAppName());        // Find if selector information exists by name        SelectorDO selectorDO = findByNameAndPluginName(contextPath, pluginName);        if (Objects.isNull(selectorDO)) {            // Create a default selector message if it does not exist            return registerSelector(contextPath, pluginName, selectorHandler);        }        return selectorDO.getId();    }

   //register selector   private String registerSelector(final String contextPath, final String pluginName, final String selectorHandler) {        //build selector        SelectorDTO selectorDTO = buildSelectorDTO(contextPath, pluginMapper.selectByName(pluginName).getId());        selectorDTO.setHandle(selectorHandler);        //register default selector        return registerDefault(selectorDTO);    }     //build selector    private SelectorDTO buildSelectorDTO(final String contextPath, final String pluginId) {        //build default        SelectorDTO selectorDTO = buildDefaultSelectorDTO(contextPath);        selectorDTO.setPluginId(pluginId);         //build the conditional properties of the default selector        selectorDTO.setSelectorConditions(buildDefaultSelectorConditionDTO(contextPath));        return selectorDTO;    }

private SelectorDTO buildDefaultSelectorDTO(final String name) {    return SelectorDTO.builder()            .name(name) // name            .type(SelectorTypeEnum.CUSTOM_FLOW.getCode()) // default type cutom            .matchMode(MatchModeEnum.AND.getCode()) //default match mode            .enabled(Boolean.TRUE)  //enable            .loged(Boolean.TRUE)  //log            .continued(Boolean.TRUE)             .sort(1)             .build();}

private List<SelectorConditionDTO> buildDefaultSelectorConditionDTO(final String contextPath) {    SelectorConditionDTO selectorConditionDTO = new SelectorConditionDTO();    selectorConditionDTO.setParamType(ParamTypeEnum.URI.getName()); // default URI    selectorConditionDTO.setParamName("/");    selectorConditionDTO.setOperator(OperatorEnum.MATCH.getAlias()); // default  match    selectorConditionDTO.setParamValue(contextPath + AdminConstants.URI_SUFFIX);     return Collections.singletonList(selectorConditionDTO);}

@Overridepublic String registerDefault(final SelectorDTO selectorDTO) {    //selector information    SelectorDO selectorDO = SelectorDO.buildSelectorDO(selectorDTO);    //selector conditional properties    List<SelectorConditionDTO> selectorConditionDTOs = selectorDTO.getSelectorConditions();    if (StringUtils.isEmpty(selectorDTO.getId())) {        // insert selector information into the database        selectorMapper.insertSelective(selectorDO);          // inserting selector conditional properties to the database        selectorConditionDTOs.forEach(selectorConditionDTO -> {            selectorConditionDTO.setSelectorId(selectorDO.getId());                        selectorConditionMapper.insertSelective(SelectorConditionDO.buildSelectorConditionDO(selectorConditionDTO));        });    }    // Publish synchronization events to synchronize selection information and its conditional attributes to the gateway    publishEvent(selectorDO, selectorConditionDTOs);    return selectorDO.getId();}

@Override    public String register(final MetaDataRegisterDTO dto) {        //1. handle selector        //......                //2. handle rule                String ruleHandler = ruleHandler();        // build default rule        RuleDTO ruleDTO = buildRpcDefaultRuleDTO(selectorId, dto, ruleHandler);        // register rule        ruleService.registerDefault(ruleDTO);                //3. reigster metadata        //......                //4. register ContextPath        //......                return ShenyuResultMessage.SUCCESS;    }

    @Override    protected String ruleHandler() {        // default rule        return new DubboRuleHandle().toJson();    }

public class DubboRuleHandle implements RuleHandle {
    /**     * dubbo version.     */    private String version;
    /**     * group.     */    private String group;
    /**     * retry.     */    private Integer retries = 0;
    /**     * loadbalance:RANDOM     */    private String loadbalance = LoadBalanceEnum.RANDOM.getName();
    /**     * timeout default 3000     */    private long timeout = Constants.TIME_OUT;}

  // build default rule    private RuleDTO buildRpcDefaultRuleDTO(final String selectorId, final MetaDataRegisterDTO metaDataDTO, final String ruleHandler) {        return buildRuleDTO(selectorId, ruleHandler, metaDataDTO.getRuleName(), metaDataDTO.getPath());    }   //  build default rule    private RuleDTO buildRuleDTO(final String selectorId, final String ruleHandler, final String ruleName, final String path) {        RuleDTO ruleDTO = RuleDTO.builder()                .selectorId(selectorId)                .name(ruleName)                 .matchMode(MatchModeEnum.AND.getCode())                 .enabled(Boolean.TRUE)                 .loged(Boolean.TRUE)                 .sort(1)                .handle(ruleHandler)                .build();        RuleConditionDTO ruleConditionDTO = RuleConditionDTO.builder()                .paramType(ParamTypeEnum.URI.getName())                 .paramName("/")                .paramValue(path)                 .build();        if (path.indexOf("*") > 1) {            ruleConditionDTO.setOperator(OperatorEnum.MATCH.getAlias());         } else {            ruleConditionDTO.setOperator(OperatorEnum.EQ.getAlias());         }        ruleDTO.setRuleConditions(Collections.singletonList(ruleConditionDTO));        return ruleDTO;    }

    @Override    public String registerDefault(final RuleDTO ruleDTO) {        RuleDO exist = ruleMapper.findBySelectorIdAndName(ruleDTO.getSelectorId(), ruleDTO.getName());        if (Objects.nonNull(exist)) {            return "";        }
        RuleDO ruleDO = RuleDO.buildRuleDO(ruleDTO);        List<RuleConditionDTO> ruleConditions = ruleDTO.getRuleConditions();        if (StringUtils.isEmpty(ruleDTO.getId())) {            // insert rule information into the database            ruleMapper.insertSelective(ruleDO);            //insert  rule body conditional attributes into the database            ruleConditions.forEach(ruleConditionDTO -> {                ruleConditionDTO.setRuleId(ruleDO.getId());                     ruleConditionMapper.insertSelective(RuleConditionDO.buildRuleConditionDO(ruleConditionDTO));            });        }        // Publish events to the gateway for data synchronization        publishEvent(ruleDO, ruleConditions);        return ruleDO.getId();    }

   @Override    public String register(final MetaDataRegisterDTO dto) {        //1. register selector        //......                //2. register rule        //......                //3. register metadata        registerMetadata(dto);                //4. register ContextPath        //......                return ShenyuResultMessage.SUCCESS;    }

    @Override    protected void registerMetadata(final MetaDataRegisterDTO dto) {            // get metaDataService            MetaDataService metaDataService = getMetaDataService();            MetaDataDO exist = metaDataService.findByPath(dto.getPath());            //insert or update metadata            metaDataService.saveOrUpdateMetaData(exist, dto);    }
    @Override    public void saveOrUpdateMetaData(final MetaDataDO exist, final MetaDataRegisterDTO metaDataDTO) {        DataEventTypeEnum eventType;        // DTO->DO        MetaDataDO metaDataDO = MetaDataTransfer.INSTANCE.mapRegisterDTOToEntity(metaDataDTO);        // insert data        if (Objects.isNull(exist)) {            Timestamp currentTime = new Timestamp(System.currentTimeMillis());            metaDataDO.setId(UUIDUtils.getInstance().generateShortUuid());            metaDataDO.setDateCreated(currentTime);            metaDataDO.setDateUpdated(currentTime);            metaDataMapper.insert(metaDataDO);            eventType = DataEventTypeEnum.CREATE;        } else {            // update            metaDataDO.setId(exist.getId());            metaDataMapper.update(metaDataDO);            eventType = DataEventTypeEnum.UPDATE;        }        // Publish sync events to gateway        eventPublisher.publishEvent(new DataChangedEvent(ConfigGroupEnum.META_DATA, eventType,                Collections.singletonList(MetaDataTransfer.INSTANCE.mapToData(metaDataDO))));    }

    @Override    public String registerURI(final String selectorName, final List<URIRegisterDTO> uriList) {        String result;        String key = key(selectorName);        try {            this.removeFallBack(key);            // register URI            result = this.doRegisterURI(selectorName, uriList);            logger.info("Register success: {},{}", selectorName, uriList);        } catch (Exception ex) {            logger.warn("Register exception: cause:{}", ex.getMessage());            result = "";            // Retry after registration failure            this.addFallback(key, new FallbackHolder(selectorName, uriList));        }        return result;    }

@Override    public String doRegisterURI(final String selectorName, final List<URIRegisterDTO> uriList) {        //check        if (CollectionUtils.isEmpty(uriList)) {            return "";        }                SelectorDO selectorDO = selectorService.findByNameAndPluginName(selectorName, PluginNameAdapter.rpcTypeAdapter(rpcType()));        if (Objects.isNull(selectorDO)) {            throw new ShenyuException("doRegister Failed to execute,wait to retry.");        }        // gte valid URI        List<URIRegisterDTO> validUriList = uriList.stream().filter(dto -> Objects.nonNull(dto.getPort()) && StringUtils.isNotBlank(dto.getHost())).collect(Collectors.toList());        // build handle        String handler = buildHandle(validUriList, selectorDO);        if (handler != null) {            selectorDO.setHandle(handler);            SelectorData selectorData = selectorService.buildByName(selectorName, PluginNameAdapter.rpcTypeAdapter(rpcType()));            selectorData.setHandle(handler);            // Update the handle property of the selector to the database            selectorService.updateSelective(selectorDO);            // Send selector update events to the gateway            eventPublisher.publishEvent(new DataChangedEvent(ConfigGroupEnum.SELECTOR, DataEventTypeEnum.UPDATE, Collections.singletonList(selectorData)));        }        return ShenyuResultMessage.SUCCESS;    }

public final class ShenyuWebHandler implements WebHandler, ApplicationListener<SortPluginEvent> {    //......        /**     * hanlde request     */    @Override    public Mono<Void> handle(@NonNull final ServerWebExchange exchange) {       // execute default plugin chain        Mono<Void> execute = new DefaultShenyuPluginChain(plugins).execute(exchange);        if (scheduled) {            return execute.subscribeOn(scheduler);        }        return execute;    }        private static class DefaultShenyuPluginChain implements ShenyuPluginChain {
        private int index;
        private final List<ShenyuPlugin> plugins;
          DefaultShenyuPluginChain(final List<ShenyuPlugin> plugins) {            this.plugins = plugins;        }
        /**         * execute.         */        @Override        public Mono<Void> execute(final ServerWebExchange exchange) {            return Mono.defer(() -> {                if (this.index < plugins.size()) {                    // get plugin                     ShenyuPlugin plugin = plugins.get(this.index++);                    boolean skip = plugin.skip(exchange);                    if (skip) {                        // next                        return this.execute(exchange);                    }                    // execute                    return plugin.execute(exchange, this);                }                return Mono.empty();            });        }    }}

@Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        // plugin name        String pluginName = named();        // plugin data        PluginData pluginData = BaseDataCache.getInstance().obtainPluginData(pluginName);        if (pluginData != null && pluginData.getEnabled()) {            // selector data            final Collection<SelectorData> selectors = BaseDataCache.getInstance().obtainSelectorData(pluginName);            if (CollectionUtils.isEmpty(selectors)) {                return handleSelectorIfNull(pluginName, exchange, chain);            }            // match selector            SelectorData selectorData = matchSelector(exchange, selectors);            if (Objects.isNull(selectorData)) {                return handleSelectorIfNull(pluginName, exchange, chain);            }            selectorLog(selectorData, pluginName);            // rule data            List<RuleData> rules = BaseDataCache.getInstance().obtainRuleData(selectorData.getId());            if (CollectionUtils.isEmpty(rules)) {                return handleRuleIfNull(pluginName, exchange, chain);            }            // match rule            RuleData rule;            if (selectorData.getType() == SelectorTypeEnum.FULL_FLOW.getCode()) {                //get last                rule = rules.get(rules.size() - 1);            } else {                rule = matchRule(exchange, rules);            }            if (Objects.isNull(rule)) {                return handleRuleIfNull(pluginName, exchange, chain);            }            ruleLog(rule, pluginName);            // execute            return doExecute(exchange, chain, selectorData, rule);        }        return chain.execute(exchange);    }

public class GlobalPlugin implements ShenyuPlugin {    // shenyu context    private final ShenyuContextBuilder builder;        //......        @Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {       // build context information to be passed into the exchange        ShenyuContext shenyuContext = builder.build(exchange);        exchange.getAttributes().put(Constants.CONTEXT, shenyuContext);        return chain.execute(exchange);    }        //......}

public class DefaultShenyuContextBuilder implements ShenyuContextBuilder {    //......        @Override    public ShenyuContext build(final ServerWebExchange exchange) {        //build data        Pair<String, MetaData> buildData = buildData(exchange);        //wrap ShenyuContext        return decoratorMap.get(buildData.getLeft()).decorator(buildDefaultContext(exchange.getRequest()), buildData.getRight());    }        private Pair<String, MetaData> buildData(final ServerWebExchange exchange) {        //......        //get the metadata according to the requested uri        MetaData metaData = MetaDataCache.getInstance().obtain(request.getURI().getPath());        if (Objects.nonNull(metaData) && Boolean.TRUE.equals(metaData.getEnabled())) {            exchange.getAttributes().put(Constants.META_DATA, metaData);            return Pair.of(metaData.getRpcType(), metaData);        } else {            return Pair.of(RpcTypeEnum.HTTP.getName(), new MetaData());        }    }    //set the default context information    private ShenyuContext buildDefaultContext(final ServerHttpRequest request) {        String appKey = request.getHeaders().getFirst(Constants.APP_KEY);        String sign = request.getHeaders().getFirst(Constants.SIGN);        String timestamp = request.getHeaders().getFirst(Constants.TIMESTAMP);        ShenyuContext shenyuContext = new ShenyuContext();        String path = request.getURI().getPath();        shenyuContext.setPath(path);         shenyuContext.setAppKey(appKey);        shenyuContext.setSign(sign);        shenyuContext.setTimestamp(timestamp);        shenyuContext.setStartDateTime(LocalDateTime.now());        Optional.ofNullable(request.getMethod()).ifPresent(httpMethod -> shenyuContext.setHttpMethod(httpMethod.name()));        return shenyuContext;    } }

public class DubboShenyuContextDecorator implements ShenyuContextDecorator {        @Override    public ShenyuContext decorator(final ShenyuContext shenyuContext, final MetaData metaData) {        shenyuContext.setModule(metaData.getAppName());        shenyuContext.setMethod(metaData.getServiceName());         shenyuContext.setContextPath(metaData.getContextPath());         shenyuContext.setRpcType(RpcTypeEnum.DUBBO.getName());         return shenyuContext;    }        @Override    public String rpcType() {        return RpcTypeEnum.DUBBO.getName();    }}

public class RpcParamTransformPlugin implements ShenyuPlugin {
    @Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        //get request information from exchange        ServerHttpRequest request = exchange.getRequest();        ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        if (Objects.nonNull(shenyuContext)) {           // APPLICATION_JSON            MediaType mediaType = request.getHeaders().getContentType();            if (MediaType.APPLICATION_JSON.isCompatibleWith(mediaType)) {                return body(exchange, request, chain);            }            // APPLICATION_FORM_URLENCODED            if (MediaType.APPLICATION_FORM_URLENCODED.isCompatibleWith(mediaType)) {                return formData(exchange, request, chain);            }            //query            return query(exchange, request, chain);        }        return chain.execute(exchange);    }        //APPLICATION_JSON    private Mono<Void> body(final ServerWebExchange exchange, final ServerHttpRequest serverHttpRequest, final ShenyuPluginChain chain) {        return Mono.from(DataBufferUtils.join(serverHttpRequest.getBody())                .flatMap(body -> {                    exchange.getAttributes().put(Constants.PARAM_TRANSFORM, resolveBodyFromRequest(body));//解析body，保存到exchange中                    return chain.execute(exchange);                }));    }   // APPLICATION_FORM_URLENCODED    private Mono<Void> formData(final ServerWebExchange exchange, final ServerHttpRequest serverHttpRequest, final ShenyuPluginChain chain) {        return Mono.from(DataBufferUtils.join(serverHttpRequest.getBody())                .flatMap(map -> {                    String param = resolveBodyFromRequest(map);                    LinkedMultiValueMap<String, String> linkedMultiValueMap;                    try {                        linkedMultiValueMap = BodyParamUtils.buildBodyParams(URLDecoder.decode(param, StandardCharsets.UTF_8.name())); //格式化数据                    } catch (UnsupportedEncodingException e) {                        return Mono.error(e);                    }                    exchange.getAttributes().put(Constants.PARAM_TRANSFORM, HttpParamConverter.toMap(() -> linkedMultiValueMap));// 保存到exchange中                    return chain.execute(exchange);                }));    }    //query    private Mono<Void> query(final ServerWebExchange exchange, final ServerHttpRequest serverHttpRequest, final ShenyuPluginChain chain) {        exchange.getAttributes().put(Constants.PARAM_TRANSFORM, HttpParamConverter.ofString(() -> serverHttpRequest.getURI().getQuery()));//保存到exchange中        return chain.execute(exchange);    }    //...... }

public abstract class AbstractDubboPlugin extends AbstractShenyuPlugin {        @Override    public Mono<Void> doExecute(final ServerWebExchange exchange,                                   final ShenyuPluginChain chain,                                   final SelectorData selector,                                   final RuleData rule) {        //param        String param = exchange.getAttribute(Constants.PARAM_TRANSFORM);        //context        ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        assert shenyuContext != null;        //metaData        MetaData metaData = exchange.getAttribute(Constants.META_DATA);        //check metaData        if (!checkMetaData(metaData)) {            LOG.error(" path is : {}, meta data have error : {}", shenyuContext.getPath(), metaData);            exchange.getResponse().setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.META_DATA_ERROR, null);            return WebFluxResultUtils.result(exchange, error);        }        //check        if (Objects.nonNull(metaData) && StringUtils.isNoneBlank(metaData.getParameterTypes()) && StringUtils.isBlank(param)) {            exchange.getResponse().setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);            Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.DUBBO_HAVE_BODY_PARAM, null);            return WebFluxResultUtils.result(exchange, error);        }        //set rpcContext        this.rpcContext(exchange);        //dubbo invoke        return this.doDubboInvoker(exchange, chain, selector, rule, metaData, param);    }}

public class ApacheDubboPlugin extends AbstractDubboPlugin {        @Override    protected Mono<Void> doDubboInvoker(final ServerWebExchange exchange,                                        final ShenyuPluginChain chain,                                        final SelectorData selector,                                        final RuleData rule,                                        final MetaData metaData,                                        final String param) {        //set the current selector and rule information, and request address for dubbo graying support        RpcContext.getContext().setAttachment(Constants.DUBBO_SELECTOR_ID, selector.getId());        RpcContext.getContext().setAttachment(Constants.DUBBO_RULE_ID, rule.getId());        RpcContext.getContext().setAttachment(Constants.DUBBO_REMOTE_ADDRESS, Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress());        //dubbo generic invoker        final Mono<Object> result = dubboProxyService.genericInvoker(param, metaData, exchange);        //execute next plugin in chain        return result.then(chain.execute(exchange));    }}

public class ApacheDubboProxyService {    //...... 
    /**     * Generic invoker object.     */    public Mono<Object> genericInvoker(final String body, final MetaData metaData, final ServerWebExchange exchange) throws ShenyuException {        //1.Get the ReferenceConfig object        ReferenceConfig<GenericService> reference = ApacheDubboConfigCache.getInstance().get(metaData.getPath());
        if (Objects.isNull(reference) || StringUtils.isEmpty(reference.getInterface())) {            //Failure of the current cache information            ApacheDubboConfigCache.getInstance().invalidate(metaData.getPath());            //Reinitialization with metadata            reference = ApacheDubboConfigCache.getInstance().initRef(metaData);        }        //2.Get the GenericService object of the generalization service        GenericService genericService = reference.get();        //3.Constructing the request parameter pair object        Pair<String[], Object[]> pair;        if (StringUtils.isBlank(metaData.getParameterTypes()) || ParamCheckUtils.dubboBodyIsEmpty(body)) {            pair = new ImmutablePair<>(new String[]{}, new Object[]{});        } else {            pair = dubboParamResolveService.buildParameter(body, metaData.getParameterTypes());        }        //4.Initiating asynchronous generalization calls        return Mono.fromFuture(invokeAsync(genericService, metaData.getMethodName(), pair.getLeft(), pair.getRight()).thenApply(ret -> {            //handle result            if (Objects.isNull(ret)) {                ret = Constants.DUBBO_RPC_RESULT_EMPTY;            }            exchange.getAttributes().put(Constants.RPC_RESULT, ret);            exchange.getAttributes().put(Constants.CLIENT_RESPONSE_RESULT_TYPE, ResultEnum.SUCCESS.getName());            return ret;        })).onErrorMap(exception -> exception instanceof GenericException ? new ShenyuException(((GenericException) exception).getExceptionMessage()) : new ShenyuException(exception));//处理异常    }        //Generalized calls, asynchronous operations    private CompletableFuture<Object> invokeAsync(final GenericService genericService, final String method, final String[] parameterTypes, final Object[] args) throws GenericException {        genericService.$invoke(method, parameterTypes, args);        Object resultFromFuture = RpcContext.getContext().getFuture();        return resultFromFuture instanceof CompletableFuture ? (CompletableFuture<Object>) resultFromFuture : CompletableFuture.completedFuture(resultFromFuture);    }}

public abstract class AbstractDubboPluginDataHandler implements PluginDataHandler {    //......        //Initializing the configuration cache   protected abstract void initConfigCache(DubboRegisterConfig dubboRegisterConfig);
    @Override    public void handlerPlugin(final PluginData pluginData) {        if (Objects.nonNull(pluginData) && Boolean.TRUE.equals(pluginData.getEnabled())) {            //Data deserialization            DubboRegisterConfig dubboRegisterConfig = GsonUtils.getInstance().fromJson(pluginData.getConfig(), DubboRegisterConfig.class);            DubboRegisterConfig exist = Singleton.INST.get(DubboRegisterConfig.class);            if (Objects.isNull(dubboRegisterConfig)) {                return;            }            if (Objects.isNull(exist) || !dubboRegisterConfig.equals(exist)) {                // Perform initialization operations                this.initConfigCache(dubboRegisterConfig);            }            Singleton.INST.single(DubboRegisterConfig.class, dubboRegisterConfig);        }    }    //......}

public class ApacheDubboPluginDataHandler extends AbstractDubboPluginDataHandler {
    @Override    protected void initConfigCache(final DubboRegisterConfig dubboRegisterConfig) {        //perform initialization operations        ApacheDubboConfigCache.getInstance().init(dubboRegisterConfig);        //cached results before failure        ApacheDubboConfigCache.getInstance().invalidateAll();    }}

public final class ApacheDubboConfigCache extends DubboConfigCache {    //......     /**     * init     */    public void init(final DubboRegisterConfig dubboRegisterConfig) {        //ApplicationConfig        if (Objects.isNull(applicationConfig)) {            applicationConfig = new ApplicationConfig("shenyu_proxy");        }        //When the protocol or address changes, you need to update the registryConfig        if (needUpdateRegistryConfig(dubboRegisterConfig)) {            RegistryConfig registryConfigTemp = new RegistryConfig();            registryConfigTemp.setProtocol(dubboRegisterConfig.getProtocol());            registryConfigTemp.setId("shenyu_proxy");            registryConfigTemp.setRegister(false);            registryConfigTemp.setAddress(dubboRegisterConfig.getRegister());            Optional.ofNullable(dubboRegisterConfig.getGroup()).ifPresent(registryConfigTemp::setGroup);            registryConfig = registryConfigTemp;        }        //ConsumerConfig        if (Objects.isNull(consumerConfig)) {            consumerConfig = ApplicationModel.getConfigManager().getDefaultConsumer().orElseGet(() -> {                ConsumerConfig consumerConfig = new ConsumerConfig();                consumerConfig.refresh();                return consumerConfig;            });                       //ConsumerConfig            Optional.ofNullable(dubboRegisterConfig.getThreadpool()).ifPresent(consumerConfig::setThreadpool);             Optional.ofNullable(dubboRegisterConfig.getCorethreads()).ifPresent(consumerConfig::setCorethreads);            Optional.ofNullable(dubboRegisterConfig.getThreads()).ifPresent(consumerConfig::setThreads);            Optional.ofNullable(dubboRegisterConfig.getQueues()).ifPresent(consumerConfig::setQueues);        }    }        //Does the registration configuration need to be updated    private boolean needUpdateRegistryConfig(final DubboRegisterConfig dubboRegisterConfig) {        if (Objects.isNull(registryConfig)) {            return true;        }        return !Objects.equals(dubboRegisterConfig.getProtocol(), registryConfig.getProtocol())                || !Objects.equals(dubboRegisterConfig.getRegister(), registryConfig.getAddress())                || !Objects.equals(dubboRegisterConfig.getProtocol(), registryConfig.getProtocol());    }
    //......}

public class ApacheDubboMetaDataSubscriber implements MetaDataSubscriber {    //local memory cache    private static final ConcurrentMap<String, MetaData> META_DATA = Maps.newConcurrentMap();
    //update metaData    public void onSubscribe(final MetaData metaData) {        // dubbo        if (RpcTypeEnum.DUBBO.getName().equals(metaData.getRpcType())) {            //Whether the corresponding metadata exists            MetaData exist = META_DATA.get(metaData.getPath());            if (Objects.isNull(exist) || Objects.isNull(ApacheDubboConfigCache.getInstance().get(metaData.getPath()))) {                // initRef                ApacheDubboConfigCache.getInstance().initRef(metaData);            } else {                // The corresponding metadata has undergone an update operation                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())) {                    //Build ReferenceConfig again based on the latest metadata                    ApacheDubboConfigCache.getInstance().build(metaData);                }            }            //local memory cache            META_DATA.put(metaData.getPath(), metaData);        }    }
    //dalete    public void unSubscribe(final MetaData metaData) {        if (RpcTypeEnum.DUBBO.getName().equals(metaData.getRpcType())) {            //使ReferenceConfig失效            ApacheDubboConfigCache.getInstance().invalidate(metaData.getPath());            META_DATA.remove(metaData.getPath());        }    }}

public final class ApacheDubboConfigCache extends DubboConfigCache {    //......        public ReferenceConfig<GenericService> initRef(final MetaData metaData) {            try {                //First try to get it from the cache, and return it directly if it exists                ReferenceConfig<GenericService> referenceConfig = cache.get(metaData.getPath());                if (StringUtils.isNoneBlank(referenceConfig.getInterface())) {                    return referenceConfig;                }            } catch (ExecutionException e) {                LOG.error("init dubbo ref exception", e);            }                      //build if not exist            return build(metaData);        }
        /**         * Build reference config.         */        @SuppressWarnings("deprecation")        public ReferenceConfig<GenericService> build(final MetaData metaData) {            if (Objects.isNull(applicationConfig) || Objects.isNull(registryConfig)) {                return new ReferenceConfig<>();            }            ReferenceConfig<GenericService> reference = new ReferenceConfig<>(); //ReferenceConfig            reference.setGeneric("true"); //generic invoke            reference.setAsync(true);//async
            reference.setApplication(applicationConfig);//applicationConfig            reference.setRegistry(registryConfig);//registryConfig            reference.setConsumer(consumerConfig);//consumerConfig            reference.setInterface(metaData.getServiceName());//serviceName            reference.setProtocol("dubbo");//dubbo            reference.setCheck(false);             reference.setLoadbalance("gray");//gray
            Map<String, String> parameters = new HashMap<>(2);            parameters.put("dispatcher", "direct");            reference.setParameters(parameters);
            String rpcExt = metaData.getRpcExt();//rpc ext param            DubboParam dubboParam = parserToDubboParam(rpcExt);            if (Objects.nonNull(dubboParam)) {                if (StringUtils.isNoneBlank(dubboParam.getVersion())) {                    reference.setVersion(dubboParam.getVersion());//version                }                if (StringUtils.isNoneBlank(dubboParam.getGroup())) {                    reference.setGroup(dubboParam.getGroup());//group                }                if (StringUtils.isNoneBlank(dubboParam.getUrl())) {                    reference.setUrl(dubboParam.getUrl());//url                }                if (StringUtils.isNoneBlank(dubboParam.getCluster())) {                    reference.setCluster(dubboParam.getCluster());                }                Optional.ofNullable(dubboParam.getTimeout()).ifPresent(reference::setTimeout);//timeout                Optional.ofNullable(dubboParam.getRetries()).ifPresent(reference::setRetries);//retires                Optional.ofNullable(dubboParam.getSent()).ifPresent(reference::setSent);//Whether to ack async-sent            }            try {                //get GenericService                Object obj = reference.get();                if (Objects.nonNull(obj)) {                    LOG.info("init apache dubbo reference success there meteData is :{}", metaData);                    //cache reference                    cache.put(metaData.getPath(), reference);                }            } catch (Exception e) {                LOG.error("init apache dubbo reference exception", e);            }            return reference;        }    //......    }

    @Override    public Mono<Void> execute(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        ShenyuContext shenyuContext = exchange.getAttribute(Constants.CONTEXT);        assert shenyuContext != null;        // handle results according to rpc type        return writerMap.get(shenyuContext.getRpcType()).writeWith(exchange, chain);    }

public class RPCMessageWriter implements MessageWriter {
    @Override    public Mono<Void> writeWith(final ServerWebExchange exchange, final ShenyuPluginChain chain) {        return chain.execute(exchange).then(Mono.defer(() -> {            Object result = exchange.getAttribute(Constants.RPC_RESULT); //result            if (Objects.isNull(result)) {                 Object error = ShenyuResultWrap.error(exchange, ShenyuResultEnum.SERVICE_RESULT_ERROR, null);                return WebFluxResultUtils.result(exchange, error);            }            return WebFluxResultUtils.result(exchange, result);        }));    }}