com.alibaba.dubbo.rpc.cluster.Configurator Java Examples

/**
 * Convert override urls to map for use when re-refer.
 * Send all rules every time, the urls will be reassembled and calculated  将重写url转换为映射，以便在重新引用时使用。每次发送所有规则，url将被重新组装和计算
 *
 * @param urls Contract:
 *             </br>1.override://0.0.0.0/...( or override://ip:port...?anyhost=true)&para1=value1... means global rules (all of the providers take effect)
 *             </br>2.override://ip:port...?anyhost=false Special rules (only for a certain provider)
 *             </br>3.override:// rule is not supported... ,needs to be calculated by registry itself.
 *             </br>4.override://0.0.0.0/ without parameters means clearing the override
 * @return
 */
public static List<Configurator> toConfigurators(List<URL> urls) {
    if (urls == null || urls.isEmpty()) {
        return Collections.emptyList();
    }

    List<Configurator> configurators = new ArrayList<Configurator>(urls.size());
    for (URL url : urls) {
        if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
            configurators.clear();
            break;
        }
        Map<String, String> override = new HashMap<String, String>(url.getParameters());
        //The anyhost parameter of override may be added automatically, it can't change the judgement of changing url 重写的anyhost参数可以自动添加，不能改变改变url的判断
        override.remove(Constants.ANYHOST_KEY);
        if (override.size() == 0) {
            configurators.clear();
            continue;
        }
        configurators.add(configuratorFactory.getConfigurator(url));
    }
    Collections.sort(configurators);
    return configurators;
}
 

/**
 * 将overrideURL转换为map，供重新refer时使用.
 * 每次下发全部规则，全部重新组装计算
 * @param urls
 * 契约：
 * </br>1.override://0.0.0.0/...(或override://ip:port...?anyhost=true)&para1=value1...表示全局规则(对所有的提供者全部生效)
 * </br>2.override://ip:port...?anyhost=false 特例规则（只针对某个提供者生效）
 * </br>3.不支持override://规则... 需要注册中心自行计算.
 * </br>4.不带参数的override://0.0.0.0/ 表示清除override 
 * @return
 */
public static List<Configurator> toConfigurators(List<URL> urls){
    List<Configurator> configurators = new ArrayList<Configurator>(urls.size());
    if (urls == null || urls.size() == 0){
        return configurators;
    }
    for(URL url : urls){
        if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
            configurators.clear();
            break;
        }
        Map<String,String> override = new HashMap<String, String>(url.getParameters());
        //override 上的anyhost可能是自动添加的，不能影响改变url判断
        override.remove(Constants.ANYHOST_KEY);
        if (override.size() == 0){
            configurators.clear();
            continue;
        }
        configurators.add(configuratorFactory.getConfigurator(url));
    }
    Collections.sort(configurators);
    return configurators;
}
 

/**
 * 将overrideURL转换为map，供重新refer时使用.
 * 每次下发全部规则，全部重新组装计算
 * @param urls
 * 契约：
 * </br>1.override://0.0.0.0/...(或override://ip:port...?anyhost=true)&para1=value1...表示全局规则(对所有的提供者全部生效)
 * </br>2.override://ip:port...?anyhost=false 特例规则（只针对某个提供者生效）
 * </br>3.不支持override://规则... 需要注册中心自行计算.
 * </br>4.不带参数的override://0.0.0.0/ 表示清除override 
 * @return
 */
public static List<Configurator> toConfigurators(List<URL> urls){
    List<Configurator> configurators = new ArrayList<Configurator>(urls.size());
    if (urls == null || urls.size() == 0){
        return configurators;
    }
    for(URL url : urls){
        if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
            configurators.clear();
            break;
        }
        Map<String,String> override = new HashMap<String, String>(url.getParameters());
        //override 上的anyhost可能是自动添加的，不能影响改变url判断
        override.remove(Constants.ANYHOST_KEY);
        if (override.size() == 0){
            configurators.clear();
            continue;
        }
        configurators.add(configuratorFactory.getConfigurator(url));
    }
    Collections.sort(configurators);
    return configurators;
}
 

/**
 * Sort by host, priority
 * 1. the url with a specific host ip should have higher priority than 0.0.0.0
 * 2. if two url has the same host, compare by priority value；
 *
 * @param o
 * @return
 */
@Override
public int compareTo(Configurator o) {
    if (o == null) {
        return -1;
    }

    int ipCompare = getUrl().getHost().compareTo(o.getUrl().getHost());
    if (ipCompare == 0) {//host is the same, sort by priority
        int i = getUrl().getParameter(Constants.PRIORITY_KEY, 0),
                j = o.getUrl().getParameter(Constants.PRIORITY_KEY, 0);
        return i < j ? -1 : (i == j ? 0 : 1);
    } else {
        return ipCompare;
    }


}
 

/**
 * 将overrideURL转换为map，供重新refer时使用.
 * 每次下发全部规则，全部重新组装计算
 * @param urls
 * 契约：
 * </br>1.override://0.0.0.0/...(或override://ip:port...?anyhost=true)&para1=value1...表示全局规则(对所有的提供者全部生效)
 * </br>2.override://ip:port...?anyhost=false 特例规则（只针对某个提供者生效）
 * </br>3.不支持override://规则... 需要注册中心自行计算.
 * </br>4.不带参数的override://0.0.0.0/ 表示清除override 
 * @return
 */
public static List<Configurator> toConfigurators(List<URL> urls){
    List<Configurator> configurators = new ArrayList<Configurator>(urls.size());
    if (urls == null || urls.size() == 0){
        return configurators;
    }
    for(URL url : urls){
        if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
            configurators.clear();
            break;
        }
        Map<String,String> override = new HashMap<String, String>(url.getParameters());
        //override 上的anyhost可能是自动添加的，不能影响改变url判断
        override.remove(Constants.ANYHOST_KEY);
        if (override.size() == 0){
            configurators.clear();
            continue;
        }
        configurators.add(configuratorFactory.getConfigurator(url));
    }
    Collections.sort(configurators);
    return configurators;
}
 

/**
 * 将overrideURL转换为map，供重新refer时使用.
 * 每次下发全部规则，全部重新组装计算
 * @param urls
 * 契约：
 * </br>1.override://0.0.0.0/...(或override://ip:port...?anyhost=true)&para1=value1...表示全局规则(对所有的提供者全部生效)
 * </br>2.override://ip:port...?anyhost=false 特例规则（只针对某个提供者生效）
 * </br>3.不支持override://规则... 需要注册中心自行计算.
 * </br>4.不带参数的override://0.0.0.0/ 表示清除override 
 * @return
 */
public static List<Configurator> toConfigurators(List<URL> urls){
    List<Configurator> configurators = new ArrayList<Configurator>(urls.size());
    if (urls == null || urls.size() == 0){
        return configurators;
    }
    for(URL url : urls){
        if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
            configurators.clear();
            break;
        }
        Map<String,String> override = new HashMap<String, String>(url.getParameters());
        //override 上的anyhost可能是自动添加的，不能影响改变url判断
        override.remove(Constants.ANYHOST_KEY);
        if (override.size() == 0){
            configurators.clear();
            continue;
        }
        configurators.add(configuratorFactory.getConfigurator(url));
    }
    Collections.sort(configurators);
    return configurators;
}
 

/**
 * 合并url参数 顺序为override > -D >Consumer > Provider
 * @param providerUrl
 * @param overrides
 * @return
 */
private URL mergeUrl(URL providerUrl){
    providerUrl = ClusterUtils.mergeUrl(providerUrl, queryMap); // 合并消费端参数
    
    List<Configurator> localConfigurators = this.configurators; // local reference
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            providerUrl = configurator.configure(providerUrl);
        }
    }
    
    providerUrl = providerUrl.addParameter(Constants.CHECK_KEY, String.valueOf(false)); // 不检查连接是否成功，总是创建Invoker！
    
    //directoryUrl 与 override 合并是在notify的最后，这里不能够处理
    this.overrideDirectoryUrl = this.overrideDirectoryUrl.addParametersIfAbsent(providerUrl.getParameters()); // 合并提供者参数        
    
    if ((providerUrl.getPath() == null || providerUrl.getPath().length() == 0)
            && "dubbo".equals(providerUrl.getProtocol())) { // 兼容1.0
        //fix by tony.chenl DUBBO-44
        String path = directoryUrl.getParameter(Constants.INTERFACE_KEY);
        if (path != null) {
            int i = path.indexOf('/');
            if (i >= 0) {
                path = path.substring(i + 1);
            }
            i = path.lastIndexOf(':');
            if (i >= 0) {
                path = path.substring(0, i);
            }
            providerUrl = providerUrl.setPath(path);
        }
    }
    return providerUrl;
}
 

private URL getNewInvokerUrl(URL url, List<URL> urls){
	List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            url = configurator.configure(url);
        }
    }
    return url;
}
 

/**
 * 合并url参数 顺序为override > -D >Consumer > Provider
 * @param providerUrl
 * @param overrides
 * @return
 */
private URL mergeUrl(URL providerUrl){
    providerUrl = ClusterUtils.mergeUrl(providerUrl, queryMap); // 合并消费端参数
    
    List<Configurator> localConfigurators = this.configurators; // local reference
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            providerUrl = configurator.configure(providerUrl);
        }
    }
    
    providerUrl = providerUrl.addParameter(Constants.CHECK_KEY, String.valueOf(false)); // 不检查连接是否成功，总是创建Invoker！
    
    //directoryUrl 与 override 合并是在notify的最后，这里不能够处理
    this.overrideDirectoryUrl = this.overrideDirectoryUrl.addParametersIfAbsent(providerUrl.getParameters()); // 合并提供者参数        
    
    if ((providerUrl.getPath() == null || providerUrl.getPath().length() == 0)
            && "dubbo".equals(providerUrl.getProtocol())) { // 兼容1.0
        //fix by tony.chenl DUBBO-44
        String path = directoryUrl.getParameter(Constants.INTERFACE_KEY);
        if (path != null) {
            int i = path.indexOf('/');
            if (i >= 0) {
                path = path.substring(i + 1);
            }
            i = path.lastIndexOf(':');
            if (i >= 0) {
                path = path.substring(0, i);
            }
            providerUrl = providerUrl.setPath(path);
        }
    }
    return providerUrl;
}
 

private URL getNewInvokerUrl(URL url, List<URL> urls){
	List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            url = configurator.configure(url);
        }
    }
    return url;
}
 

/**
 * 合并url参数 顺序为override > -D >Consumer > Provider
 * @param providerUrl
 * @param overrides
 * @return
 */
private URL mergeUrl(URL providerUrl){
    providerUrl = ClusterUtils.mergeUrl(providerUrl, queryMap); // 合并消费端参数
    
    List<Configurator> localConfigurators = this.configurators; // local reference
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            providerUrl = configurator.configure(providerUrl);
        }
    }
    
    providerUrl = providerUrl.addParameter(Constants.CHECK_KEY, String.valueOf(false)); // 不检查连接是否成功，总是创建Invoker！
    
    //directoryUrl 与 override 合并是在notify的最后，这里不能够处理
    this.overrideDirectoryUrl = this.overrideDirectoryUrl.addParametersIfAbsent(providerUrl.getParameters()); // 合并提供者参数        
    
    if ((providerUrl.getPath() == null || providerUrl.getPath().length() == 0)
            && "dubbo".equals(providerUrl.getProtocol())) { // 兼容1.0
        //fix by tony.chenl DUBBO-44
        String path = directoryUrl.getParameter(Constants.INTERFACE_KEY);
        if (path != null) {
            int i = path.indexOf('/');
            if (i >= 0) {
                path = path.substring(i + 1);
            }
            i = path.lastIndexOf(':');
            if (i >= 0) {
                path = path.substring(0, i);
            }
            providerUrl = providerUrl.setPath(path);
        }
    }
    return providerUrl;
}
 

private URL getNewInvokerUrl(URL url, List<URL> urls){
	List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            url = configurator.configure(url);
        }
    }
    return url;
}
 

private URL getNewInvokerUrl(URL url, List<URL> urls){
	List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            url = configurator.configure(url);
        }
    }
    return url;
}
 

private URL getNewInvokerUrl(URL url, List<URL> urls){
	List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            url = configurator.configure(url);
        }
    }
    return url;
}
 

/**
 * Merge url parameters. the order is: override > -D >Consumer > Provider 合并url参数。顺序是:覆盖> -D >使用者>提供者
 *
 * @param providerUrl
 * @return
 */
private URL mergeUrl(URL providerUrl) {
    providerUrl = ClusterUtils.mergeUrl(providerUrl, queryMap); // Merge the consumer side parameters

    List<Configurator> localConfigurators = this.configurators; // local reference
    if (localConfigurators != null && !localConfigurators.isEmpty()) {
        for (Configurator configurator : localConfigurators) {
            providerUrl = configurator.configure(providerUrl);
        }
    }

    providerUrl = providerUrl.addParameter(Constants.CHECK_KEY, String.valueOf(false)); // Do not check whether the connection is successful or not, always create Invoker! 不要检查连接是否成功，请始终创建调用程序!

    // The combination of directoryUrl and override is at the end of notify, which can't be handled here directoryUrl和override的组合在notify的末尾，这里无法处理
    this.overrideDirectoryUrl = this.overrideDirectoryUrl.addParametersIfAbsent(providerUrl.getParameters()); // Merge the provider side parameters

    if ((providerUrl.getPath() == null || providerUrl.getPath().length() == 0)
            && "dubbo".equals(providerUrl.getProtocol())) { // Compatible version 1.0
        //fix by tony.chenl DUBBO-44
        String path = directoryUrl.getParameter(Constants.INTERFACE_KEY);
        if (path != null) {
            int i = path.indexOf('/');
            if (i >= 0) {
                path = path.substring(i + 1);
            }
            i = path.lastIndexOf(':');
            if (i >= 0) {
                path = path.substring(0, i);
            }
            providerUrl = providerUrl.setPath(path);
        }
    }
    return providerUrl;
}
 

/**
 * 合并url参数 顺序为override > -D >Consumer > Provider
 * @param providerUrl
 * @param overrides
 * @return
 */
private URL mergeUrl(URL providerUrl){
    providerUrl = ClusterUtils.mergeUrl(providerUrl, queryMap); // 合并消费端参数
    
    List<Configurator> localConfigurators = this.configurators; // local reference
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            providerUrl = configurator.configure(providerUrl);
        }
    }
    
    providerUrl = providerUrl.addParameter(Constants.CHECK_KEY, String.valueOf(false)); // 不检查连接是否成功，总是创建Invoker！
    
    //directoryUrl 与 override 合并是在notify的最后，这里不能够处理
    this.overrideDirectoryUrl = this.overrideDirectoryUrl.addParametersIfAbsent(providerUrl.getParameters()); // 合并提供者参数        
    
    if ((providerUrl.getPath() == null || providerUrl.getPath().length() == 0)
            && "dubbo".equals(providerUrl.getProtocol())) { // 兼容1.0
        //fix by tony.chenl DUBBO-44
        String path = directoryUrl.getParameter(Constants.INTERFACE_KEY);
        if (path != null) {
            int i = path.indexOf('/');
            if (i >= 0) {
                path = path.substring(i + 1);
            }
            i = path.lastIndexOf(':');
            if (i >= 0) {
                path = path.substring(0, i);
            }
            providerUrl = providerUrl.setPath(path);
        }
    }
    return providerUrl;
}
 

public Configurator getConfigurator(URL url) {
    return new OverrideConfigurator(url);
}
 

@Override
public Configurator getConfigurator(URL url) {
    return new OverrideConfigurator(url);
}
 

@Override
public Configurator getConfigurator(URL url) {
    return new AbsentConfigurator(url);
}
 

@Override
    public synchronized void notify(List<URL> urls) {
        List<URL> invokerUrls = new ArrayList<URL>();
        List<URL> routerUrls = new ArrayList<URL>();
        List<URL> configuratorUrls = new ArrayList<URL>();
        for (URL url : urls) {
            String protocol = url.getProtocol();
            String category = url.getParameter(Constants.CATEGORY_KEY, Constants.DEFAULT_CATEGORY);
            if (Constants.ROUTERS_CATEGORY.equals(category)
                    || Constants.ROUTE_PROTOCOL.equals(protocol)) {
                routerUrls.add(url);
            } else if (Constants.CONFIGURATORS_CATEGORY.equals(category)
                    || Constants.OVERRIDE_PROTOCOL.equals(protocol)) {
                configuratorUrls.add(url);
            } else if (Constants.PROVIDERS_CATEGORY.equals(category)) {
                invokerUrls.add(url);
            } else {
                logger.warn("Unsupported category " + category + " in notified url: " + url + " from registry " + getUrl().getAddress() + " to consumer " + NetUtils.getLocalHost());
            }
        }
        // configurators
        if (configuratorUrls != null && !configuratorUrls.isEmpty()) {
            this.configurators = toConfigurators(configuratorUrls);
        }
        // routers
        if (routerUrls != null && !routerUrls.isEmpty()) {
            List<Router> routers = toRouters(routerUrls);
            if (routers != null) { // null - do nothing
                setRouters(routers);
            }
        }
        List<Configurator> localConfigurators = this.configurators; // local reference
        // merge override parameters
//        zookeeper://localhost:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-consumer&check=false&default.client=netty4&dubbo=2.0.2&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&pid=98470&qos.port=33333&register.ip=172.28.87.51&side=consumer&timeout=3000000&timestamp=1574153201694
        this.overrideDirectoryUrl = directoryUrl;
        if (localConfigurators != null && !localConfigurators.isEmpty()) {
            for (Configurator configurator : localConfigurators) {
                this.overrideDirectoryUrl = configurator.configure(overrideDirectoryUrl);
            }
        }
        // providers 服务发生改变重新订阅后刷新创建的代理的invoker
        refreshInvoker(invokerUrls);
    }
 

public synchronized void notify(List<URL> urls) {
    List<URL> invokerUrls = new ArrayList<URL>();
    List<URL> routerUrls = new ArrayList<URL>();
    List<URL> configuratorUrls = new ArrayList<URL>();
    for (URL url : urls) {
        String protocol = url.getProtocol();
        String category = url.getParameter(Constants.CATEGORY_KEY, Constants.DEFAULT_CATEGORY);
        if (Constants.ROUTERS_CATEGORY.equals(category) 
                || Constants.ROUTE_PROTOCOL.equals(protocol)) {
            routerUrls.add(url);
        } else if (Constants.CONFIGURATORS_CATEGORY.equals(category) 
                || Constants.OVERRIDE_PROTOCOL.equals(protocol)) {
            configuratorUrls.add(url);
        } else if (Constants.PROVIDERS_CATEGORY.equals(category)) {
            invokerUrls.add(url);
        } else {
            logger.warn("Unsupported category " + category + " in notified url: " + url + " from registry " + getUrl().getAddress() + " to consumer " + NetUtils.getLocalHost());
        }
    }
    // configurators 
    if (configuratorUrls != null && configuratorUrls.size() >0 ){
        this.configurators = toConfigurators(configuratorUrls);
    }
    // routers
    if (routerUrls != null && routerUrls.size() >0 ){
        List<Router> routers = toRouters(routerUrls);
        if(routers != null){ // null - do nothing
            setRouters(routers);
        }
    }
    List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    this.overrideDirectoryUrl = directoryUrl;
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            this.overrideDirectoryUrl = configurator.configure(overrideDirectoryUrl);
        }
    }
    // providers
    refreshInvoker(invokerUrls);
}
 

public Configurator getConfigurator(URL url) {
    return new AbsentConfigurator(url);
}
 

public Configurator getConfigurator(URL url) {
    return new OverrideConfigurator(url);
}
 

public int compareTo(Configurator o) {
    if (o == null) {
        return -1;
    }
    return getUrl().getHost().compareTo(o.getUrl().getHost());
}
 

/**
         * @param urls The list of registered information , is always not empty, The meaning is the same as the return value of {@link com.alibaba.dubbo.registry.RegistryService#lookup(URL)}.
         *             当接收到服务更改通知时触发。
        通知需要支持的合同:总是在服务接口和数据类型维度上进行通知。也就是说，不会通知属于某个服务的同一类型数据的一部分。用户不需要比较上一个通知的结果。2. 订阅的第一个通知必须是服务所有类型数据的完整通知。
        3.在变更时，允许分别通知不同类型的数据，例如:提供者、使用者、路由器、覆盖。它只允许通知这些类型中的一种，但是这种类型的数据必须是完整的，而不是增量的。4. 如果数据类型为空，则需要用url数据的类别参数标识通知空协议。
        5. 通知的顺序由通知保证(即注册中心的实现)。例如:单线程推送、队列序列化和版本比较。
         */
        @Override
        public synchronized void notify(List<URL> urls) {
            logger.debug("original override urls: " + urls);
//            判断当前监听器订阅的url是否一致
//            provider://172.28.87.51:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&bean.name=com.alibaba.dubbo.demo.DemoService&category=configurators&check=false&default.server=netty4&dubbo=2.0.2&generic=false&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&pid=9611&side=provider&timestamp=1574156237792
            List<URL> matchedUrls = getMatchedUrls(urls, subscribeUrl);
            logger.debug("subscribe url: " + subscribeUrl + ", override urls: " + matchedUrls);
            // No matching results
            if (matchedUrls.isEmpty()) {
                return;
            }

            List<Configurator> configurators = RegistryDirectory.toConfigurators(matchedUrls);

            final Invoker<?> invoker;
            if (originInvoker instanceof InvokerDelegete) {
                invoker = ((InvokerDelegete<?>) originInvoker).getInvoker();
            } else {
                invoker = originInvoker;
            }
            //The origin invoker 获取执行器的服务提供者url
//            dubbo://172.28.87.51:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&bean.name=com.alibaba.dubbo.demo.DemoService&bind.ip=172.28.87.51&bind.port=20880&default.server=netty4&dubbo=2.0.2&generic=false&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&pid=9611&qos.port=22222&side=provider&timestamp=1574156237792
            URL originUrl = RegistryProtocol.this.getProviderUrl(invoker);
//            根据invoker找到provider url
//            dubbo://172.28.87.51:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&bean.name=com.alibaba.dubbo.demo.DemoService&bind.ip=172.28.87.51&bind.port=20880&default.server=netty4&dubbo=2.0.2&generic=false&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&pid=9611&qos.port=22222&side=provider&timestamp=1574156237792
            String key = getCacheKey(originInvoker);
//            根据provider url找到本地的exporter
            ExporterChangeableWrapper<?> exporter = bounds.get(key);
            if (exporter == null) {
                logger.warn(new IllegalStateException("error state, exporter should not be null"));
                return;
            }
            //The current, may have been merged many times当前，可能已经合并了很多次
            URL currentUrl = exporter.getInvoker().getUrl();
            //Merged with this configuration
            URL newUrl = getConfigedInvokerUrl(configurators, originUrl);
            if (!currentUrl.equals(newUrl)) {
//                =》服务export的url发生改变了重新export服务
                RegistryProtocol.this.doChangeLocalExport(originInvoker, newUrl);
                logger.info("exported provider url changed, origin url: " + originUrl + ", old export url: " + currentUrl + ", new export url: " + newUrl);
            }
        }
 

private URL getConfigedInvokerUrl(List<Configurator> configurators, URL url) {
    for (Configurator configurator : configurators) {
        url = configurator.configure(url);
    }
    return url;
}
 

public synchronized void notify(List<URL> urls) {
    List<URL> invokerUrls = new ArrayList<URL>();
    List<URL> routerUrls = new ArrayList<URL>();
    List<URL> configuratorUrls = new ArrayList<URL>();
    for (URL url : urls) {
        String protocol = url.getProtocol();
        String category = url.getParameter(Constants.CATEGORY_KEY, Constants.DEFAULT_CATEGORY);
        if (Constants.ROUTERS_CATEGORY.equals(category) 
                || Constants.ROUTE_PROTOCOL.equals(protocol)) {
            routerUrls.add(url);
        } else if (Constants.CONFIGURATORS_CATEGORY.equals(category) 
                || Constants.OVERRIDE_PROTOCOL.equals(protocol)) {
            configuratorUrls.add(url);
        } else if (Constants.PROVIDERS_CATEGORY.equals(category)) {
            invokerUrls.add(url);
        } else {
            logger.warn("Unsupported category " + category + " in notified url: " + url + " from registry " + getUrl().getAddress() + " to consumer " + NetUtils.getLocalHost());
        }
    }
    // configurators 
    if (configuratorUrls != null && configuratorUrls.size() >0 ){
        this.configurators = toConfigurators(configuratorUrls);
    }
    // routers
    if (routerUrls != null && routerUrls.size() >0 ){
        List<Router> routers = toRouters(routerUrls);
        if(routers != null){ // null - do nothing
            setRouters(routers);
        }
    }
    List<Configurator> localConfigurators = this.configurators; // local reference
    // 合并override参数
    this.overrideDirectoryUrl = directoryUrl;
    if (localConfigurators != null && localConfigurators.size() > 0) {
        for (Configurator configurator : localConfigurators) {
            this.overrideDirectoryUrl = configurator.configure(overrideDirectoryUrl);
        }
    }
    // providers
    refreshInvoker(invokerUrls);
}
 

public Configurator getConfigurator(URL url) {
    return new AbsentConfigurator(url);
}
 

public int compareTo(Configurator o) {
    if (o == null) {
        return -1;
    }
    return getUrl().getHost().compareTo(o.getUrl().getHost());
}
 

public int compareTo(Configurator o) {
    if (o == null) {
        return -1;
    }
    return getUrl().getHost().compareTo(o.getUrl().getHost());
}