Day09_08_Dubbo教程之服务发布源码解析

太过爱你忘了你带给我的痛 2024-01-20 08:03 61阅读 0赞

## Dubbo服务发布源码解析 ##

### 一. 服务发布概述 ###

Dubbo服务发布影响流程的主要包括三个部分,依次是:

*  服务暴露;
 *  心跳;
 *  服务注册.

服务暴露是对外提供服务及暴露端口,以便消费端可以正常调用服务;心跳机制保证服务器端及客户端能够保持正常的长连接;服务注册是向注册中心注册服务暴露服务的过程.

### 二. Dubbo服务暴露 ###

此处只记录主要代码部分以便能快速定位到主要的核心代码:

#### 1. ServiceConfig.java中代码 ####

if (registryURLs != null && registryURLs.size() > 0
     && url.getParameter("register", true)) {
         // 循环祖册中心 URL 数组 registryURLs
         for (URL registryURL : registryURLs) {
             // "dynamic" ：服务是否动态注册，如果设为false，注册后将显示后disable状态，需人工启用，并且服务提供者停止时，也不会自动取消册，需人工禁用。
             url = url.addParameterIfAbsent("dynamic", registryURL.getParameter("dynamic"));
             // 获得监控中心 URL
             URL monitorUrl = loadMonitor(registryURL);
             if (monitorUrl != null) {
             // 将监控中心的 URL 作为 "monitor" 参数添加到服务提供者的 URL 中，并且需要编码。通过这样的方式，服务提供者的 URL 中，包含了监控中心的配置。
             url = url.addParameterAndEncoded(Constants.MONITOR_KEY, monitorUrl.toFullString());
             }
             if (logger.isInfoEnabled()) {
             logger.info("Register dubbo service " + interfaceClass.getName() + " url " + url + " to registry " + registryURL);
             }
             // 使用 ProxyFactory 创建 Invoker 对象
             // 调用 URL#addParameterAndEncoded(key, value) 方法，将服务体用这的 URL 作为 "export" 参数添加到注册中心的 URL 中。通过这样的方式，注册中心的 URL 中，包含了服务提供者的配置。
             // 创建 Invoker 对象。该 Invoker 对象，执行 #invoke(invocation) 方法时，内部会调用 Service 对象( ref )对应的调用方法。
             Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, registryURL.addParameterAndEncoded(Constants.EXPORT_KEY, url.toFullString()));
             // 使用 Protocol 暴露 Invoker 对象
             /**
             * Protocol$Adaptive => ProtocolFilterWrapper => ProtocolListenerWrapper => RegistryProtocol
             * =>
             * Protocol$Adaptive => ProtocolFilterWrapper => ProtocolListenerWrapper => DubboProtocol
             */
             Exporter<?> exporter = protocol.export(invoker);
             // 添加到 `exporters`
             exporters.add(exporter);
         }
    }

循环注册中心,对每个注册中心都执行代码块中的执行过程:

*  1️⃣.如果url中没有 dynamic 参数,则从registerUrl中取值,并赋予url.
    
    dynamic是服务动态注册的标识,默认为true,如果设置为false,则服务注册后显示disable状态,需人工启动;
 *  2️⃣.加载注册中心对应的监控中心配置;
 *  3️⃣.如果注册中心不为空则设置url的 monitor参数;
 *  4️⃣.Invoker proxyFactory.getInvoker proxyFactory 默认为JavassistProxyFactory对象,这段代码为创建 ref 服务对象的代理对象.

proxyFactory.getInvoker(ref, (Class) interfaceClass, registryURL.addParameterAndEncoded(Constants.EXPORT_KEY, url.toFullString()));

获取ref的代理对象并在registryURL 中添加export属性,代理对象中属性参数如下:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70][]

*  5️⃣.protocol.export(invoker) 为暴露服务的核心实现部分,协议的调用链如下:

/**
    
    * Protocol$Adaptive => ProtocolFilterWrapper => ProtocolListenerWrapper => RegistryProtocol
    
    * =>
    
    * Protocol$Adaptive => ProtocolFilterWrapper => ProtocolListenerWrapper => DubboProtocol
    
    */

**其中DubboProtocol 实现了服务暴露及心跳检测功能;  
RegistryProtocol 调用DubboProtocol及注册服务.**

接下来经过两个扩展类(包装器): ProtocolFilterWrapper和ProtocolListenerWrapper 进入RegistryProtocol.

#### 2. RegistryProtocol核心代码: ####

public <T> Exporter<T> export(final Invoker<T> originInvoker) throws RpcException {
     // 暴露服务
     //export invoker
     final ExporterChangeableWrapper<T> exporter = doLocalExport(originInvoker);
     //registry provider
     final Registry registry = getRegistry(originInvoker);
     // 获得服务提供者 URL
     final URL registedProviderUrl = getRegistedProviderUrl(originInvoker);
     registry.register(registedProviderUrl);
     // 订阅override数据
     // FIXME 提供者订阅时，会影响同一JVM即暴露服务，又引用同一服务的的场景，因为subscribed以服务名为缓存的key，导致订阅信息覆盖。
     final URL overrideSubscribeUrl = getSubscribedOverrideUrl(registedProviderUrl);
     final OverrideListener overrideSubscribeListener = new OverrideListener(overrideSubscribeUrl, originInvoker);
     overrideListeners.put(overrideSubscribeUrl, overrideSubscribeListener);
     registry.subscribe(overrideSubscribeUrl, overrideSubscribeListener);
     //保证每次export都返回一个新的exporter实例
     return new Exporter<T>() {
     public Invoker<T> getInvoker() {
     return exporter.getInvoker();
     }
     public void unexport() {
     try {
     exporter.unexport();
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     try {
     registry.unregister(registedProviderUrl);
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     try {
     overrideListeners.remove(overrideSubscribeUrl);
     registry.unsubscribe(overrideSubscribeUrl, overrideSubscribeListener);
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     }
     };
    }

/**
     * 暴露服务。
     *
     * 此处的 Local 指的是，本地启动服务，但是不包括向注册中心注册服务的意思。
     * @param originInvoker
     * @param <T>
     * @return
     */
    @SuppressWarnings("unchecked")
    private <T> ExporterChangeableWrapper<T> doLocalExport(final Invoker<T> originInvoker) {
     // 获得在 `bounds` 中的缓存 Key
     //dubbo://192.168.20.218:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&default.accepts=1000&default.threadpool=fixed&default.threads=100&default.timeout=5000&dubbo=2.0.0&generic=false&
     // interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&owner=uce&pid=1760&side=provider&timestamp=1530150456618
     String key = getCacheKey(originInvoker);
     ExporterChangeableWrapper<T> exporter = (ExporterChangeableWrapper<T>) bounds.get(key);
     if (exporter == null) {
     synchronized (bounds) {
     exporter = (ExporterChangeableWrapper<T>) bounds.get(key);
     // 未暴露过，进行暴露服务
     if (exporter == null) {
     // InvokerDelegete 实现 com.alibaba.dubbo.rpc.protocol.InvokerWrapper 类，主要增加了 #getInvoker() 方法，获得真实的，非 InvokerDelegete 的 Invoker 对象。
     // 因为，可能会存在 InvokerDelegete.invoker 也是 InvokerDelegete 类型的情况。 getProviderUrl 同上 key = getCacheKey
     final Invoker<?> invokerDelegete = new InvokerDelegete<T>(originInvoker, getProviderUrl(originInvoker));
     // 暴露服务，创建 Exporter 对象
     Exporter<T> export = (Exporter<T>) protocol.export(invokerDelegete);
     // 使用 创建的Exporter对象 + originInvoker ，创建 ExporterChangeableWrapper 对象
     exporter = new ExporterChangeableWrapper<T>(export, originInvoker);
     bounds.put(key, exporter);
     }
     }
     }
     return exporter;
    }

1️⃣.代用同步锁+double-check的方式来保证同样的服务不重复暴露.

2️⃣.`new InvokerDelegete<T>(originInvoker, getProviderUrl(originInvoker))`;

InvokerDelegete 实现 com.alibaba.dubbo.rpc.protocol.InvokerWrapper（invoke）类,主要增加了 \#getInvoker() 方法,获得真实的,非 InvokerDelegete 的 Invoker 对象.  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 1][]

3️⃣.调用protocol.export接口 经过ProtocolFilterWrapper.invoker方法 创过滤器链再暴露服务:

protocol.export(buildInvokerChain(invoker, Constants.SERVICE_FILTER_KEY, Constants.PROVIDER));
    
    /**
     * 构建过滤器链
     * @param invoker injvm://127.0.0.1/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&default.accepts=1000&default.threadpool=fixed&default.threads=100&default.timeout=5000&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&owner=uce&pid=9932&side=provider&timestamp=1527930395583
     * @param key service.filter 该参数用于获得 ServiceConfig 或 ReferenceConfig 配置的自定义过滤器
     * 以 ServiceConfig 举例子，例如 url = injvm://127.0.0.1/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&bind.ip=192.168.3.17&bind.port=20880&default.delay=-1&default.retries=0&default.service.filter=demo&delay=-1&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&methods=sayHello&pid=81844&qos.port=22222&service.filter=demo&side=provider&timestamp=1520682156043 中，
     * service.filter=demo，这是笔者配置自定义的 DemoFilter 过滤器。
     * <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" filter="demo" />
     * @param group provider 属性，分组
     * 在暴露服务时，group = provider 。
     * 在引用服务时，group = consumer 。
     * @param <T>
     * @return
     */
    private static <T> Invoker<T> buildInvokerChain(final Invoker<T> invoker, String key, String group) {
     Invoker<T> last = invoker;
     List<Filter> filters = ExtensionLoader.getExtensionLoader(Filter.class).getActivateExtension(invoker.getUrl(), key, group);
     /* EchoFilter
     ClassLoaderFilter
     GenericFilter
     ContextFilter
     TraceFilter
     TimeoutFilter
     MonitorFilter
     ExceptionFilter
     DemoFilter 【自定义】*/
     //倒序循环 Filter ，创建带 Filter 链的 Invoker 对象。因为是通过嵌套声明匿名类循环调用的方式，所以要倒序。可以手工模拟下这个过程。通过这样的方式，实际过滤的顺序，还是我们上面看到的正序
     if (filters.size() > 0) {
     for (int i = filters.size() - 1; i >= 0; i--) {
     final Filter filter = filters.get(i);
     final Invoker<T> next = last;
     last = new Invoker<T>() {
     @Override
     public Class<T> getInterface() {
     return invoker.getInterface();
     }
     @Override
     public URL getUrl() {
     return invoker.getUrl();
     }
     @Override
     public boolean isAvailable() {
     return invoker.isAvailable();
     }
     @Override
     public Result invoke(Invocation invocation) throws RpcException {
     return filter.invoke(next, invocation);
     }
     @Override
     public void destroy() {
     invoker.destroy();
     }
     @Override
     public String toString() {
     return invoker.toString();
     }
     };
     }
     }
     return last;
    }
    List<Filter> filters = ExtensionLoader.getExtensionLoader(Filter.class).getActivateExtension(invoker.getUrl(), key, group);
    
    获取Active的属于指定组的过过滤器列表
    
    参考文章：https://my.oschina.net/LucasZhu/blog/1835048
    
    接下来执行DubboProrocol进行服务暴露的过程。
    
    public <T> Exporter<T> export(Invoker<T> invoker) throws RpcException {
     URL url = invoker.getUrl();
     // export service.
     String key = serviceKey(url);
     // 创建 DubboExporter 对象，并添加到 `exporterMap` 。
     DubboExporter<T> exporter = new DubboExporter<T>(invoker, key, exporterMap);
     exporterMap.put(key, exporter);
     //export an stub service for dispaching event
     Boolean isStubSupportEvent = url.getParameter(Constants.STUB_EVENT_KEY, Constants.DEFAULT_STUB_EVENT);
     Boolean isCallbackservice = url.getParameter(Constants.IS_CALLBACK_SERVICE, false);
     if (isStubSupportEvent && !isCallbackservice) {
     String stubServiceMethods = url.getParameter(Constants.STUB_EVENT_METHODS_KEY);
     if (stubServiceMethods == null || stubServiceMethods.length() == 0) {
     if (logger.isWarnEnabled()) {
     logger.warn(new IllegalStateException("consumer [" + url.getParameter(Constants.INTERFACE_KEY) +
     "], has set stubproxy support event ,but no stub methods founded."));
     }
     } else {
     stubServiceMethodsMap.put(url.getServiceKey(), stubServiceMethods);
     }
     }
     // 启动服务器
     openServer(url);
     return exporter;
    }

1️⃣.获取invoker的 URL信息;

2️⃣.获取key信息 为URL中interface与暴露端口的拼装字符串:com.alibaba.dubbo.demo.DemoService:20880

3️⃣.创建DubboExporter对象 并且入参为exporterMap;

4️⃣.将exporter对象添加到exporterMap中.

/**
     * 启动服务器
     *
     * @param url URL
     */
    private void openServer(URL url) {
     // find server.
     String key = url.getAddress();
     //client 也可以暴露一个只有server可以调用的服务。
     boolean isServer = url.getParameter(Constants.IS_SERVER_KEY, true);
     if (isServer) {
     ExchangeServer server = serverMap.get(key);
     if (server == null) {
     serverMap.put(key, createServer(url));
     } else {
     //server支持reset,配合override功能使用
     server.reset(url);
     }
     }
    }
    调用createServer()方法 并存入DubboProtocol的serverMap中
    
    private ExchangeServer createServer(URL url) {
     //默认开启server关闭时发送readonly事件
     url = url.addParameterIfAbsent(Constants.CHANNEL_READONLYEVENT_SENT_KEY, Boolean.TRUE.toString());
     //默认开启heartbeat
     url = url.addParameterIfAbsent(Constants.HEARTBEAT_KEY, String.valueOf(Constants.DEFAULT_HEARTBEAT));
     String str = url.getParameter(Constants.SERVER_KEY, Constants.DEFAULT_REMOTING_SERVER);
     // 校验 Server 的 Dubbo SPI 拓展是否存在
     if (str != null && str.length() > 0 && !ExtensionLoader.getExtensionLoader(Transporter.class).hasExtension(str))
     throw new RpcException("Unsupported server type: " + str + ", url: " + url);
     // 设置codec为 `"Dubbo"`
     url = url.addParameter(Constants.CODEC_KEY, Version.isCompatibleVersion() ? COMPATIBLE_CODEC_NAME : DubboCodec.NAME);
     ExchangeServer server;
     try {
     server = Exchangers.bind(url, requestHandler);
     } catch (RemotingException e) {
     throw new RpcException("Fail to start server(url: " + url + ") " + e.getMessage(), e);
     }
     str = url.getParameter(Constants.CLIENT_KEY);
     if (str != null && str.length() > 0) {
     Set<String> supportedTypes = ExtensionLoader.getExtensionLoader(Transporter.class).getSupportedExtensions();
     if (!supportedTypes.contains(str)) {
     throw new RpcException("Unsupported client type: " + str);
     }
     }
     return server;
    }

1️⃣.默认开启server 关闭时发送readonly事件: channel.readonly.sent : true

2️⃣.默认开启 heartbeat;

3️⃣.获取服务暴露的 server 传输,默认为netty;

4️⃣.设置编码器为Dubbo也就是 DubboCountCodec;

5️⃣.Exchangers\#bind(url, requestHandler) 启动服务器,requestHandler结构如下:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 2][]

#### Exchangers\#bind()实现代码: ####

private ExchangeHandler requestHandler = new ExchangeHandlerAdapter() {
     public Object reply(ExchangeChannel channel, Object message) throws RemotingException {
     if (message instanceof Invocation) {
     Invocation inv = (Invocation) message;
     Invoker<?> invoker = getInvoker(channel, inv);
     //如果是callback 需要处理高版本调用低版本的问题
     if (Boolean.TRUE.toString().equals(inv.getAttachments().get(IS_CALLBACK_SERVICE_INVOKE))) {
     String methodsStr = invoker.getUrl().getParameters().get("methods");
     boolean hasMethod = false;
     if (methodsStr == null || methodsStr.indexOf(",") == -1) {
     hasMethod = inv.getMethodName().equals(methodsStr);
     } else {
     String[] methods = methodsStr.split(",");
     for (String method : methods) {
     if (inv.getMethodName().equals(method)) {
     hasMethod = true;
     break;
     }
     }
     }
     if (!hasMethod) {
     logger.warn(new IllegalStateException("The methodName " + inv.getMethodName() + " not found in callback service interface ,invoke will be ignored. please update the api interface. url is:" + invoker.getUrl()) + " ,invocation is :" + inv);
     return null;
     }
     }
     RpcContext.getContext().setRemoteAddress(channel.getRemoteAddress());
     return invoker.invoke(inv);
     }
     throw new RemotingException(channel, "Unsupported request: " + message == null ? null : (message.getClass().getName() + ": " + message) + ", channel: consumer: " + channel.getRemoteAddress() + " --> provider: " + channel.getLocalAddress());
     }
     @Override
     public void received(Channel channel, Object message) throws RemotingException {
     if (message instanceof Invocation) {
     reply((ExchangeChannel) channel, message);
     } else {
     super.received(channel, message);
     }
     }
     @Override
     public void connected(Channel channel) throws RemotingException {
     invoke(channel, Constants.ON_CONNECT_KEY);
     }
     @Override
     public void disconnected(Channel channel) throws RemotingException {
     if (logger.isInfoEnabled()) {
     logger.info("disconected from " + channel.getRemoteAddress() + ",url:" + channel.getUrl());
     }
     invoke(channel, Constants.ON_DISCONNECT_KEY);
     }
     private void invoke(Channel channel, String methodKey) {
     Invocation invocation = createInvocation(channel, channel.getUrl(), methodKey);
     if (invocation != null) {
     try {
     received(channel, invocation);
     } catch (Throwable t) {
     logger.warn("Failed to invoke event method " + invocation.getMethodName() + "(), cause: " + t.getMessage(), t);
     }
     }
     }
     private Invocation createInvocation(Channel channel, URL url, String methodKey) {
     String method = url.getParameter(methodKey);
     if (method == null || method.length() == 0) {
     return null;
     }
     RpcInvocation invocation = new RpcInvocation(method, new Class<?>[0], new Object[0]);
     invocation.setAttachment(Constants.PATH_KEY, url.getPath());
     invocation.setAttachment(Constants.GROUP_KEY, url.getParameter(Constants.GROUP_KEY));
     invocation.setAttachment(Constants.INTERFACE_KEY, url.getParameter(Constants.INTERFACE_KEY));
     invocation.setAttachment(Constants.VERSION_KEY, url.getParameter(Constants.VERSION_KEY));
     if (url.getParameter(Constants.STUB_EVENT_KEY, false)) {
     invocation.setAttachment(Constants.STUB_EVENT_KEY, Boolean.TRUE.toString());
     }
     return invocation;
     }
    };
    Exchangeers.bind(URL url, ExchangeHandler handler)
    
    public static ExchangeServer bind(URL url, ExchangeHandler handler) throws RemotingException {
     if (url == null) {
     throw new IllegalArgumentException("url == null");
     }
     if (handler == null) {
     throw new IllegalArgumentException("handler == null");
     }
     url = url.addParameterIfAbsent(Constants.CODEC_KEY, "exchange");
     return getExchanger(url).bind(url, handler);
    }
    public static Exchanger getExchanger(URL url) {
     String type = url.getParameter(Constants.EXCHANGER_KEY, Constants.DEFAULT_EXCHANGER);
     return getExchanger(type);
    }
    public static Exchanger getExchanger(String type) {
     return ExtensionLoader.getExtensionLoader(Exchanger.class).getExtension(type);
    }
    接口作用是设置exchanger params为header 并且获取Exchanger.class的header扩展接口HeaderExchanger， 并调用bind方法：
    
    public class HeaderExchanger implements Exchanger {
     public static final String NAME = "header";
     public ExchangeClient connect(URL url, ExchangeHandler handler) throws RemotingException {
     return new HeaderExchangeClient(Transporters.connect(url, new DecodeHandler(new HeaderExchangeHandler(handler))), true);
     }
     public ExchangeServer bind(URL url, ExchangeHandler handler) throws RemotingException {
     return new HeaderExchangeServer(Transporters.bind(url, new DecodeHandler(new HeaderExchangeHandler(handler))));
     }
    }

先将 DubboProtocol入参 传过来的ExchangeHandler对象ExchangeHandlerAdapter() 进行包装组成handler链:最后返回ChannelHandler对象,接下来调用:Transporters.bind(url, new DecodeHandler(new HeaderExchangeHandler(handler))).

Server Transporters.bind(URL url, ChannelHandler... handlers)

Transpoter$Adaptive.bind()  
![Image 1][]![20190611201335338.png][]

数据透传 NettyTransporter.java

Server NettyTransporter.bind(URL url, ChannelHandler listener)

public Server bind(URL url, ChannelHandler listener) throws RemotingException \{  
return new NettyServer(url, listener);  
\}  
作用是:

返回一个NettyServer实例:

public NettyServer(URL url, ChannelHandler handler) throws RemotingException {
     super(url, ChannelHandlers.wrap(handler, ExecutorUtil.setThreadName(url, SERVER_THREAD_POOL_NAME)));
    }
    ExecutorUtil.setThreadName(url, SERVER_THREAD_POOL_NAME)) 只用是生成获取ThreadName的名称 为URL添加threadname的param
    
    ChannelHandlers.wrap(ChannelHandler handler, URL url) 代码如下：
    
    public class ChannelHandlers {
     private static ChannelHandlers INSTANCE = new ChannelHandlers();
     protected ChannelHandlers() {
     }
     public static ChannelHandler wrap(ChannelHandler handler, URL url) {
     return ChannelHandlers.getInstance().wrapInternal(handler, url);
     }
     protected static ChannelHandlers getInstance() {
     return INSTANCE;
     }
     static void setTestingChannelHandlers(ChannelHandlers instance) {
     INSTANCE = instance;
     }
     protected ChannelHandler wrapInternal(ChannelHandler handler, URL url) {
     return new MultiMessageHandler(new HeartbeatHandler(ExtensionLoader.getExtensionLoader(Dispatcher.class)
     .getAdaptiveExtension().dispatch(handler, url)));
     }
    }
    ExtensionLoader.getExtensionLoader(Dispatcher.class).getAdaptiveExtension().dispatch(handler, url)：

![Image 1][]![20190611201348752.png][]

获取到AllDispatcher分发器进行透传:

public class AllDispatcher implements Dispatcher {
     public static final String NAME = "all";
     public ChannelHandler dispatch(ChannelHandler handler, URL url) {
     return new AllChannelHandler(handler, url);
     }
    }

结构如图所示:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 3][]

调用WrappedChannelHandler的构造方法:

public WrappedChannelHandler(ChannelHandler handler, URL url) {
     this.handler = handler;
     this.url = url;
     executor = (ExecutorService) ExtensionLoader.getExtensionLoader(ThreadPool.class).getAdaptiveExtension().getExecutor(url);
     String componentKey = Constants.EXECUTOR_SERVICE_COMPONENT_KEY;
     if (Constants.CONSUMER_SIDE.equalsIgnoreCase(url.getParameter(Constants.SIDE_KEY))) {
     componentKey = Constants.CONSUMER_SIDE;
     }
     DataStore dataStore = ExtensionLoader.getExtensionLoader(DataStore.class).getDefaultExtension();
     dataStore.put(componentKey, Integer.toString(url.getPort()), executor);
    }

这段代码的功能为:

1️⃣.将 之前头创的DecoderHandler对象再进包装 包装为AllChannelHandler;

2️⃣.生成线程池对象Executor对象;

3️⃣.获取默认的DataStore对象，并将线程池对象放入DataStore 中 key为: java.util.concurrent.ExecutorService 字符串和服务暴露的端口,值为线程池对象:

return new MultiMessageHandler(new HeartbeatHandler(ExtensionLoader.getExtensionLoader(Dispatcher.class).getAdaptiveExtension().dispatch(handler, url)));

接下来将返回的AllChannelHandler对象用HeartbeatHandler 和 MultiMessageHandler 进行包装处理并返回ChannelHandler.wrap() 的上一端.

NettyTransporter.bind(URL url, ChannelHandler listener) -> new NettyServer(URL url, ChannelHandler handler)
    
    -> super(url, ChannelHandlers.wrap(handler, ExecutorUtil.setThreadName(url, SERVER_THREAD_POOL_NAME)));

接下来是创建NettyServer对象的最后一步:

NettyServer ==>
    public NettyServer(URL url, ChannelHandler handler) throws RemotingException {
     super(url, ChannelHandlers.wrap(handler, ExecutorUtil.setThreadName(url, SERVER_THREAD_POOL_NAME)));
    }
    AbstractServer==>
    public AbstractServer(URL url, ChannelHandler handler) throws RemotingException {
     super(url, handler);
     localAddress = getUrl().toInetSocketAddress();
     String host = url.getParameter(Constants.ANYHOST_KEY, false)
     || NetUtils.isInvalidLocalHost(getUrl().getHost())
     ? NetUtils.ANYHOST : getUrl().getHost();
     bindAddress = new InetSocketAddress(host, getUrl().getPort());
     this.accepts = url.getParameter(Constants.ACCEPTS_KEY, Constants.DEFAULT_ACCEPTS);
     this.idleTimeout = url.getParameter(Constants.IDLE_TIMEOUT_KEY, Constants.DEFAULT_IDLE_TIMEOUT);
     try {
     doOpen();
     if (logger.isInfoEnabled()) {
     logger.info("Start " + getClass().getSimpleName() + " bind " + getBindAddress() + ", export " + getLocalAddress());
     }
     } catch (Throwable t) {
     throw new RemotingException(url.toInetSocketAddress(), null, "Failed to bind " + getClass().getSimpleName()
     + " on " + getLocalAddress() + ", cause: " + t.getMessage(), t);
     }
     //fixme replace this with better method
     DataStore dataStore = ExtensionLoader.getExtensionLoader(DataStore.class).getDefaultExtension();
     executor = (ExecutorService) dataStore.get(Constants.EXECUTOR_SERVICE_COMPONENT_KEY, Integer.toString(url.getPort()));
    }
    AbstractEndpoint ==>
    public AbstractEndpoint(URL url, ChannelHandler handler) {
     super(url, handler);
     this.codec = getChannelCodec(url);
     this.timeout = url.getPositiveParameter(Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT);
     this.connectTimeout = url.getPositiveParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT);
    }
    AbstractPeer==>
    public AbstractPeer(URL url, ChannelHandler handler) {
     if (url == null) {
     throw new IllegalArgumentException("url == null");
     }
     if (handler == null) {
     throw new IllegalArgumentException("handler == null");
     }
     this.url = url;
     this.handler = handler;
    }

调用栈如上所示:

因为之前设置了codec为dubbo 所以返回DubboCountCodec实例.

获取超时时间timeout,和链接的超时时间connectTimeout.

localAddress为本地IP:PORT port为服务暴露的端口.

host 为0.0.0.0

bindAddress为 host:port port为服务暴露的端口

this.accept 为默认获取最大连接数

idleTimeout为 url中 idle.timeout

核心代码: doOpen()

@Override
    protected void doOpen() throws Throwable {
     NettyHelper.setNettyLoggerFactory();
     ExecutorService boss = Executors.newCachedThreadPool(new NamedThreadFactory("NettyServerBoss", true));
     ExecutorService worker = Executors.newCachedThreadPool(new NamedThreadFactory("NettyServerWorker", true));
     ChannelFactory channelFactory = new NioServerSocketChannelFactory(boss, worker, getUrl().getPositiveParameter(Constants.IO_THREADS_KEY, Constants.DEFAULT_IO_THREADS));
     bootstrap = new ServerBootstrap(channelFactory);
     final NettyHandler nettyHandler = new NettyHandler(getUrl(), this);
     channels = nettyHandler.getChannels();
     // https://issues.jboss.org/browse/NETTY-365
     // https://issues.jboss.org/browse/NETTY-379
     // final Timer timer = new HashedWheelTimer(new NamedThreadFactory("NettyIdleTimer", true));
     bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
     public ChannelPipeline getPipeline() {
     NettyCodecAdapter adapter = new NettyCodecAdapter(getCodec(), getUrl(), NettyServer.this);
     ChannelPipeline pipeline = Channels.pipeline();
     /*int idleTimeout = getIdleTimeout();
     if (idleTimeout > 10000) {
     pipeline.addLast("timer", new IdleStateHandler(timer, idleTimeout / 1000, 0, 0));
     }*/
     pipeline.addLast("decoder", adapter.getDecoder());
     pipeline.addLast("encoder", adapter.getEncoder());
     pipeline.addLast("handler", nettyHandler);
     return pipeline;
     }
     });
     // bind
     channel = bootstrap.bind(getBindAddress());
    }

1️⃣.首先进行Netty的日志配置:

接下来先生成 NettyCodecAdapter 入参为之前生成的codec , URL信息(主要用到buffer属性配置Netty缓冲区)及 this (Handler) 对象

接下来就是设置Netty的Encoder Decoder 来进行数据的编码与解码 其会调用 this的handler链来进行数据处理。Dubbo2.5.6采用的是Netty3来进行通讯的，此处就不进行赘述。

AbstractServer 接下来获取到从DataStore对象中获取之前缓存的线程池 ，设置 NettyServer的 executor属性。

自此，Dubbo服务暴露的代码解析完毕，NettyServer的类结构图如下:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 4][]

### 三. 心跳服务 ###

Dubbo provider的心跳服务是 HeaderExchanger bind代码执行的最后一步：参数是上面生成的Server对象 (NettyServer)。  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 5][]

public HeaderExchangeServer(Server server) {
     if (server == null) {
     throw new IllegalArgumentException("server == null");
     }
     this.server = server;
     this.heartbeat = server.getUrl().getParameter(Constants.HEARTBEAT_KEY, 0);
     this.heartbeatTimeout = server.getUrl().getParameter(Constants.HEARTBEAT_TIMEOUT_KEY, heartbeat * 3);
     if (heartbeatTimeout < heartbeat * 2) {
     throw new IllegalStateException("heartbeatTimeout < heartbeatInterval * 2");
     }
     startHeatbeatTimer();
    }

1️⃣.初始化 server信息;

2️⃣.获取server URL中heartbeat信息及心跳超时信息,默认为heartbeat的三倍;

3️⃣.执行心跳代码 startHeatbeatTimer()

private void startHeatbeatTimer() {
     stopHeartbeatTimer();
     if (heartbeat > 0) {
     heatbeatTimer = scheduled.scheduleWithFixedDelay(
     new HeartBeatTask(new HeartBeatTask.ChannelProvider() {
     public Collection<Channel> getChannels() {
     return Collections.unmodifiableCollection(
     HeaderExchangeServer.this.getChannels());
     }
     }, heartbeat, heartbeatTimeout),
     heartbeat, heartbeat, TimeUnit.MILLISECONDS);
     }
    }

1️⃣.停止定时任务——首先停止定时器中所有任务,置空 beatbeatTimer;

2️⃣.重新设置定时器,循环检测:

接下来在DubboProtocol的openServer(URL) 方法中将创建的ExchangeServer对象放入 DubboProtocol的 serverMap 集合对象中

key为服务的ip:port 如 192.168.20.218:20880

value为之前创建的ExchangeServer对象

DubboProtocol export方法到此执行完毕，最终返回的是 DubboExporter对象包装了入参的invoker对象，serviceKey信息，及服务暴露的 exporterMap对象。  
![Image 1][]  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 6][]

### 四. 服务注册 ###

我们接着来看RegistryProtocol 接下来的执行代码:

public <T> Exporter<T> export(final Invoker<T> originInvoker) throws RpcException {
     // 暴露服务
     //export invoker
     final ExporterChangeableWrapper<T> exporter = doLocalExport(originInvoker);
     //registry provider 添加定时任务 ping request response
     final Registry registry = getRegistry(originInvoker);
     // 获得服务提供者 URL
     final URL registedProviderUrl = getRegistedProviderUrl(originInvoker);
     registry.register(registedProviderUrl);
     // 订阅override数据
     // FIXME 提供者订阅时，会影响同一JVM即暴露服务，又引用同一服务的的场景，因为subscribed以服务名为缓存的key，导致订阅信息覆盖。
     final URL overrideSubscribeUrl = getSubscribedOverrideUrl(registedProviderUrl);
     final OverrideListener overrideSubscribeListener = new OverrideListener(overrideSubscribeUrl, originInvoker);
     overrideListeners.put(overrideSubscribeUrl, overrideSubscribeListener);
     registry.subscribe(overrideSubscribeUrl, overrideSubscribeListener);
     //保证每次export都返回一个新的exporter实例
     return new Exporter<T>() {
     public Invoker<T> getInvoker() {
     return exporter.getInvoker();
     }
     public void unexport() {
     try {
     exporter.unexport();
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     try {
     registry.unregister(registedProviderUrl);
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     try {
     overrideListeners.remove(overrideSubscribeUrl);
     registry.unsubscribe(overrideSubscribeUrl, overrideSubscribeListener);
     } catch (Throwable t) {
     logger.warn(t.getMessage(), t);
     }
     }
     };
    }

1️⃣.ExporterChangeableWrapper doLocalExport(final InvokeroriginInvoker) 为暴露服务的执行过程,上面流程已经走过.

返回的数据格式如下:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 7][]

2️⃣.根据originInvoker中注册中心信息获取对应的Registry对象,因为这里是zookeeper协议,所以为ZookeeperRegistry对象.

3️⃣.从注册中心的URL中获得 export 参数对应的值,即服务提供者的URL.

4️⃣.registry.register(registedProviderUrl);用之前创建的注册中心对象注册服务.

5️⃣.

// TODO
    
    上面提到 Registry getRegistry(final Invoker<?> originInvoker) 是根据invoker的地址获取registry实例代码如下：
    
    private Registry getRegistry(final Invoker<?> originInvoker) {
     // registry://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-provider&dubbo=2.0.0&export=dubbo%3A%2F%2F192.168.20.218%3A20880%2Fcom.alibaba.dubbo.demo.DemoService%3Fanyhost%3Dtrue%26application%3Ddemo-provider%26default.accepts%3D1000%26default.threadpool%3Dfixed%26default.threads%3D100%26default.timeout%3D5000%26dubbo%3D2.0.0%26generic%3Dfalse%26interface%3Dcom.alibaba.dubbo.demo.DemoService%26methods%3DsayHello%26owner%3Duce%26pid%3D12028%26side%3Dprovider%26timestamp%3D1531912729429&owner=uce&pid=12028&registry=zookeeper&timestamp=1531912729343
     URL registryUrl = originInvoker.getUrl();
     if (Constants.REGISTRY_PROTOCOL.equals(registryUrl.getProtocol())) {
     String protocol = registryUrl.getParameter(Constants.REGISTRY_KEY, Constants.DEFAULT_DIRECTORY);
     registryUrl = registryUrl.setProtocol(protocol).removeParameter(Constants.REGISTRY_KEY);
     }
     // zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-provider&dubbo=2.0.0&export=dubbo%3A%2F%2F192.168.20.218%3A20880%2Fcom.alibaba.dubbo.demo.DemoService%3Fanyhost%3Dtrue%26application%3Ddemo-provider%26default.accepts%3D1000%26default.threadpool%3Dfixed%26default.threads%3D100%26default.timeout%3D5000%26dubbo%3D2.0.0%26generic%3Dfalse%26interface%3Dcom.alibaba.dubbo.demo.DemoService%26methods%3DsayHello%26owner%3Duce%26pid%3D12028%26side%3Dprovider%26timestamp%3D1531912729429&owner=uce&pid=12028&timestamp=1531912729343
     return registryFactory.getRegistry(registryUrl);
    }

上面代码的意思是:

1️⃣.获取originalInvoker中的URL信息 (注册中心的配置信息);

2️⃣.将URL中信息中Param中registry参数获取到,并替换URL中的protocol属性,并删除Param中的registry信息,上面代码中的注释为执行前和执行后的的结果;

3️⃣.获取protocol 为 zookeeper对应的RegistryFactory接口的扩展对象 ZookeeperRegistryFactory 并执行getRegistry 方法:  
![Image 1][]![20190611201530901.png][]

ZookeeperRegistryFactory的继承结构和对应类中属性如下图所示:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 8][]

其中REGISTRIES = new ConcurrentHashMap(); 代表注册中心的配置,其中可以有多个注册中心配置.

AbstractRegistryFactory.getRegistry执行代码如下:

public Registry getRegistry(URL url) {
     url = url.setPath(RegistryService.class.getName())
     .addParameter(Constants.INTERFACE_KEY, RegistryService.class.getName())
     .removeParameters(Constants.EXPORT_KEY, Constants.REFER_KEY);
     String key = url.toServiceString(); // zookeeper://192.168.1.157:2181/com.alibaba.dubbo.registry.RegistryService
     // 锁定注册中心获取过程，保证注册中心单一实例
     LOCK.lock();
     try {
     Registry registry = REGISTRIES.get(key);
     if (registry != null) {
     return registry;
     }
     registry = createRegistry(url);
     if (registry == null) {
     throw new IllegalStateException("Can not create registry " + url);
     }
     REGISTRIES.put(key, registry);
     return registry;
     } finally {
     // 释放锁
     LOCK.unlock();
     }
    }

1️⃣.设置Path属性,添加interface参数信息,及移除export 和 refer 参数信息,执行结果如下:

zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-provider&dubbo=2.0.0&interface=com.alibaba.dubbo.registry.RegistryService&owner=uce&pid=12028&timestamp=1531912729343

2️⃣.获取url对应的serviceString信息:zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService，由于我使用的是本地的zookeeper 所以IP为 127.0.0.1

3️⃣.顺序地创建注册中心:Registry

ZookeeperRegistryFactory.createRegistry(URL url);
    
    public Registry createRegistry(URL url) {
     return new ZookeeperRegistry(url, zookeeperTransporter);
    }
    // 构造ZookeeperRegistry的调用链如下所示
    public ZookeeperRegistry(URL url, ZookeeperTransporter zookeeperTransporter) {
     super(url);
     if (url.isAnyHost()) {
     throw new IllegalStateException("registry address == null");
     }
     String group = url.getParameter(Constants.GROUP_KEY, DEFAULT_ROOT);
     if (!group.startsWith(Constants.PATH_SEPARATOR)) {
     group = Constants.PATH_SEPARATOR + group;
     }
     this.root = group;
     zkClient = zookeeperTransporter.connect(url);
     zkClient.addStateListener(new StateListener() {
     public void stateChanged(int state) {
     if (state == RECONNECTED) {
     try {
     recover();
     } catch (Exception e) {
     logger.error(e.getMessage(), e);
     }
     }
     }
     });
    }
    public FailbackRegistry(URL url) {
     super(url);
     int retryPeriod = url.getParameter(Constants.REGISTRY_RETRY_PERIOD_KEY, Constants.DEFAULT_REGISTRY_RETRY_PERIOD);
     this.retryFuture = retryExecutor.scheduleWithFixedDelay(new Runnable() {
     public void run() {
     // 检测并连接注册中心
     try {
     retry();
     } catch (Throwable t) { // 防御性容错
     logger.error("Unexpected error occur at failed retry, cause: " + t.getMessage(), t);
     }
     }
     }, retryPeriod, retryPeriod, TimeUnit.MILLISECONDS);
    }
    public AbstractRegistry(URL url) {
     setUrl(url);
     // 启动文件保存定时器
     syncSaveFile = url.getParameter(Constants.REGISTRY_FILESAVE_SYNC_KEY, false);
     String filename = url.getParameter(Constants.FILE_KEY, System.getProperty("user.home") + "/.dubbo/dubbo-registry-" + url.getHost() + ".cache");
     File file = null;
     if (ConfigUtils.isNotEmpty(filename)) {
     file = new File(filename);
     if (!file.exists() && file.getParentFile() != null && !file.getParentFile().exists()) {
     if (!file.getParentFile().mkdirs()) {
     throw new IllegalArgumentException("Invalid registry store file " + file + ", cause: Failed to create directory " + file.getParentFile() + "!");
     }
     }
     }
     this.file = file;
     loadProperties();
     notify(url.getBackupUrls());
    }

ZookeeperRegistry 的类继承结构图如图所示:  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 9][]

ZooKeeperRegistry.FailbackRegistry.AbstractRegistry中

1️⃣.setUrl设置url属性信息;

2️⃣.是否启用文件的异步保存;

3️⃣.注册中心对应的本地文件保存的位置信息：如C:UsersAdministrator/.dubbo/dubbo-registry-127.0.0.1.cache;

4️⃣.给file赋值 并且加载文件信息到properties属性中;

5️⃣.notify(url.getBackupUrls) 这段代码不知道什么意思.

ZooKeeperRegistry.FailbackRegistry中

1️⃣.获取定时任务的时间间隔;

2️⃣.开启定时任务定时检测失败的注册，并重新注册;

ZooKeeperRegistry 中

1️⃣.获取注册中心的group参数,默认为/dubbo , 并未root赋予group值

2️⃣.zkClient = zookeeperTransporter.connect(url); 链接zookeeper信息并添加状态监听事件，具体再更文详述吧，代码如下：

public ZkclientZookeeperClient(URL url) {
     super(url);
     client = new ZkClient(url.getBackupAddress());
     client.subscribeStateChanges(new IZkStateListener() {
     @Override
     public void handleStateChanged(KeeperState state) throws Exception {
     ZkclientZookeeperClient.this.state = state;
     if (state == KeeperState.Disconnected) {
     stateChanged(StateListener.DISCONNECTED);
     } else if (state == KeeperState.SyncConnected) {
     stateChanged(StateListener.CONNECTED);
     }
     }
     @Override
     public void handleNewSession() throws Exception {
     stateChanged(StateListener.RECONNECTED);
     }
     });
    }

3️⃣.添加重连状态的状态监听事件 调用 recover()方法.

至此 ZookeeperRegistry创建完毕.

ZookeeperRegistryFactory中最后将registry放入ZookeeperRegistryFactory.REGISTRIES中.

key 为zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService

value 为之前创建的ZookeeperRegistry对象.

接着返回RegistryProtocol 的export方法.

1️⃣.上面说到了调用doLocalExport(originInvoker):进行服务暴露的过程及调用getRegistry(originInvoker)方法通过ZookeeperRegistryFactory 工厂生成 ZookeeperRegistry 方法，然后加入到工厂REGISTRIES 缓存中,并返回ZookeeperRegistry 实例的过程;

2️⃣.接下来RegistryProtocol 的export方法中调用 final URL registedProviderUrl = getRegistedProviderUrl(originInvoker):获取服务提供者的URL信息,它是从注册中心的URL中获得export参数对应的值转换的URL信息(去除掉不需要在注册中心上看到的字段).  
![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N5YzAwMDY2Ng_size_16_color_FFFFFF_t_70 10][]

3️⃣.接下来调用registry.register(registedProviderUrl):进行服务的注册将暴露的服务信息注册到注册中心,并且将已经注册的服务URL缓存到ZookeeperRegistry.registered 已注册服务的缓存中.

FailbackRegistry.register
    /**
     * 进行服务注册逻辑的实现
     */
    @Override
    public void register(URL url) {
     if (destroyed.get()){
     return;
     }
     // 调用AbstractRegistry.register进行服务对应URL的缓存
     super.register(url);
     failedRegistered.remove(url);
     failedUnregistered.remove(url);
     try {
     // 向服务器端发送注册请求，将服务注册到注册中心，可以使用各个注册协议(注册中心)的实现 此处使用zookeeper ZookeeperRegistry.doRegister
     doRegister(url);
     } catch (Exception e) {
     Throwable t = e;
     // 如果开启了启动时检测，则直接抛出异常
     boolean check = getUrl().getParameter(Constants.CHECK_KEY, true)
     && url.getParameter(Constants.CHECK_KEY, true)
     && !Constants.CONSUMER_PROTOCOL.equals(url.getProtocol());
     boolean skipFailback = t instanceof SkipFailbackWrapperException;
     if (check || skipFailback) {
     if (skipFailback) {
     t = t.getCause();
     }
     throw new IllegalStateException("Failed to register " + url + " to registry " + getUrl().getAddress() + ", cause: " + t.getMessage(), t);
     } else {
     logger.error("Failed to register " + url + ", waiting for retry, cause: " + t.getMessage(), t);
     }
     // 将失败的注册请求记录到失败列表，定时重试
     failedRegistered.add(url);
     }
    }
    AbstractRegistry.register
    public void register(URL url) {
     if (url == null) {
     throw new IllegalArgumentException("register url == null");
     }
     if (logger.isInfoEnabled()) {
     logger.info("Register: " + url);
     }
     // 缓存已经注册的服务
     registered.add(url);
    }
    ZookeeperRegistry.doRegister
    protected void doRegister(URL url) {
     try {
     // 此处为具体服务暴露的代码 toUrlPath 根据URL生成写入zk的路径信息
     zkClient.create(toUrlPath(url), url.getParameter(Constants.DYNAMIC_KEY, true));
     } catch (Throwable e) {
     throw new RpcException("Failed to register " + url + " to zookeeper " + getUrl() + ", cause: " + e.getMessage(), e);
     }
    }

4️⃣.由registryProviderUrl获取overrideSubscribeUrl 再构建OverrideListener.

[Image 1]: 
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