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如上图所示的Dubbo的暴露服务的过程,不难看出它也和消费者端很像,也需要一个像reference的对象来维护service关联的所有对象及其属性,这里的reference就是provider。由于ServiceBean实现了
InitializingBean接口,所有在spring实例化这个bean后会调用接口方法afterPropertiesSet:
- public void afterPropertiesSet() throws Exception {
- //如果没有配置provider
- if (getProvider() == null) {
- //获取IOC容器里的所有provider
- Map<String, ProviderConfig> providerConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ProviderConfig.class, false, false);
- if (providerConfigMap != null && providerConfigMap.size() > 0) {
- Map<String, ProtocolConfig> protocolConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ProtocolConfig.class, false, false);
- if ((protocolConfigMap == null || protocolConfigMap.size() == 0)
- && providerConfigMap.size() > 1) { // 兼容旧版本
- List<ProviderConfig> providerConfigs = new ArrayList<ProviderConfig>();
- for (ProviderConfig config : providerConfigMap.values()) {
- if (config.isDefault() != null && config.isDefault().booleanValue()) {
- providerConfigs.add(config);
- }
- }
- //关联所有providers
- if (providerConfigs.size() > 0) {
- setProviders(providerConfigs);
- }
- } else {
- ProviderConfig providerConfig = null;
- for (ProviderConfig config : providerConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- if (providerConfig != null) {
- throw new IllegalStateException("Duplicate provider configs: " + providerConfig + " and " + config);
- }
- providerConfig = config;
- }
- }
- if (providerConfig != null) {
- setProvider(providerConfig);
- }
- }
- }
- }
- //如果没有配置application,且没有配置provider
- if (getApplication() == null
- && (getProvider() == null || getProvider().getApplication() == null)) {
- //获取所有applications
- Map<String, ApplicationConfig> applicationConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ApplicationConfig.class, false, false);
- if (applicationConfigMap != null && applicationConfigMap.size() > 0) {
- ApplicationConfig applicationConfig = null;
- for (ApplicationConfig config : applicationConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- if (applicationConfig != null) {
- throw new IllegalStateException("Duplicate application configs: " + applicationConfig + " and " + config);
- }
- applicationConfig = config;
- }
- }
- //关联application
- if (applicationConfig != null) {
- setApplication(applicationConfig);
- }
- }
- }
- //如果没有配置module,且没有配置provider
- if (getModule() == null
- && (getProvider() == null || getProvider().getModule() == null)) {
- Map<String, ModuleConfig> moduleConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ModuleConfig.class, false, false);
- if (moduleConfigMap != null && moduleConfigMap.size() > 0) {
- ModuleConfig moduleConfig = null;
- for (ModuleConfig config : moduleConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- if (moduleConfig != null) {
- throw new IllegalStateException("Duplicate module configs: " + moduleConfig + " and " + config);
- }
- moduleConfig = config;
- }
- }
- //关联module
- if (moduleConfig != null) {
- setModule(moduleConfig);
- }
- }
- }
- //如果没有配置registries,且没有配置provider
- if ((getRegistries() == null || getRegistries().size() == 0)
- && (getProvider() == null || getProvider().getRegistries() == null || getProvider().getRegistries().size() == 0)
- && (getApplication() == null || getApplication().getRegistries() == null || getApplication().getRegistries().size() == 0)) {
- Map<String, RegistryConfig> registryConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, RegistryConfig.class, false, false);
- if (registryConfigMap != null && registryConfigMap.size() > 0) {
- List<RegistryConfig> registryConfigs = new ArrayList<RegistryConfig>();
- for (RegistryConfig config : registryConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- registryConfigs.add(config);
- }
- }
- //关联registries
- if (registryConfigs != null && registryConfigs.size() > 0) {
- super.setRegistries(registryConfigs);
- }
- }
- }
- //如果没有配置monitor,且没有配置provider
- if (getMonitor() == null
- && (getProvider() == null || getProvider().getMonitor() == null)
- && (getApplication() == null || getApplication().getMonitor() == null)) {
- Map<String, MonitorConfig> monitorConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, MonitorConfig.class, false, false);
- if (monitorConfigMap != null && monitorConfigMap.size() > 0) {
- MonitorConfig monitorConfig = null;
- for (MonitorConfig config : monitorConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- if (monitorConfig != null) {
- throw new IllegalStateException("Duplicate monitor configs: " + monitorConfig + " and " + config);
- }
- monitorConfig = config;
- }
- }
- //关联monitor
- if (monitorConfig != null) {
- setMonitor(monitorConfig);
- }
- }
- }
- //如果没有配置protocol,且没有配置provider
- if ((getProtocols() == null || getProtocols().size() == 0)
- && (getProvider() == null || getProvider().getProtocols() == null || getProvider().getProtocols().size() == 0)) {
- Map<String, ProtocolConfig> protocolConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ProtocolConfig.class, false, false);
- if (protocolConfigMap != null && protocolConfigMap.size() > 0) {
- List<ProtocolConfig> protocolConfigs = new ArrayList<ProtocolConfig>();
- for (ProtocolConfig config : protocolConfigMap.values()) {
- if (config.isDefault() == null || config.isDefault().booleanValue()) {
- protocolConfigs.add(config);
- }
- }
- //关联protocol
- if (protocolConfigs != null && protocolConfigs.size() > 0) {
- super.setProtocols(protocolConfigs);
- }
- }
- }
- //如果没有配置path
- if (getPath() == null || getPath().length() == 0) {
- if (beanName != null && beanName.length() > 0
- && getInterface() != null && getInterface().length() > 0
- && beanName.startsWith(getInterface())) {
- setPath(beanName);
- }
- }
- //暴露provider
- if (! isDelay()) {
- export();
- }
- }
Dubbo在确认了所有相关对象都配置后调用export方法开始暴露过程:
- public synchronized void export() {
- //如果provider没有配置
- if (provider != null) {
- //如果exporter没有配置使用provider所关联的exporter
- if (export == null) {
- export = provider.getExport();
- }
- //如果delay(延迟暴露)没有配置,获取provider的delay
- if (delay == null) {
- delay = provider.getDelay();
- }
- }
- //如果不需要暴露接口则直接返回
- if (export != null && ! export.booleanValue()) {
- return;
- }
- //如果延迟暴露的时间(毫秒级)是存在的,开启线程并等待delay毫秒后开始暴露接口,否则直接执行暴露接口过程
- if (delay != null && delay > 0) {
- Thread thread = new Thread(new Runnable() {
- public void run() {
- try {
- Thread.sleep(delay);
- } catch (Throwable e) {
- }
- doExport();
- }
- });
- thread.setDaemon(true);
- thread.setName("DelayExportServiceThread");
- thread.start();
- } else {
- doExport();
- }
- }
- protected synchronized void doExport() {
- //如果不需要暴露接口则抛出异常
- if (unexported) {
- throw new IllegalStateException("Already unexported!");
- }
- //如果已经暴露则不需要重复暴露
- if (exported) {
- return;
- }
- exported = true;
- //如果interfaceName没配置(这样dubbo就无法找到需要暴露的service对象)则抛出异常
- if (interfaceName == null || interfaceName.length() == 0) {
- throw new IllegalStateException("<dubbo:service interface=\"\" /> interface not allow null!");
- }
- checkDefault();
- //provider已经配置的情况下,如果application、module、registries、monitor、protocol中有未配置的均可以从provider获取
- if (provider != null) {
- if (application == null) {
- application = provider.getApplication();
- }
- if (module == null) {
- module = provider.getModule();
- }
- if (registries == null) {
- registries = provider.getRegistries();
- }
- if (monitor == null) {
- monitor = provider.getMonitor();
- }
- if (protocols == null) {
- protocols = provider.getProtocols();
- }
- }
- if (module != null) {
- if (registries == null) {
- registries = module.getRegistries();
- }
- if (monitor == null) {
- monitor = module.getMonitor();
- }
- }
- if (application != null) {
- if (registries == null) {
- registries = application.getRegistries();
- }
- if (monitor == null) {
- monitor = application.getMonitor();
- }
- }
- if (ref instanceof GenericService) {
- interfaceClass = GenericService.class;
- if (StringUtils.isEmpty(generic)) {
- generic = Boolean.TRUE.toString();
- }
- } else {
- try {
- interfaceClass = Class.forName(interfaceName, true, Thread.currentThread()
- .getContextClassLoader());
- } catch (ClassNotFoundException e) {
- throw new IllegalStateException(e.getMessage(), e);
- }
- checkInterfaceAndMethods(interfaceClass, methods);
- checkRef();
- generic = Boolean.FALSE.toString();
- }
- //如果是本地服务
- if(local !=null){
- //如果是本地服务在interfaceName属性后面加上Local
- if(local=="true"){
- local=interfaceName+"Local";
- }
- Class<?> localClass;
- try {
- //加载service
- localClass = ClassHelper.forNameWithThreadContextClassLoader(local);
- } catch (ClassNotFoundException e) {
- throw new IllegalStateException(e.getMessage(), e);
- }
- if(!interfaceClass.isAssignableFrom(localClass)){
- throw new IllegalStateException("The local implemention class " + localClass.getName() + " not implement interface " + interfaceName);
- }
- }
- //如果是远程服务
- if(stub !=null){
- if(stub=="true"){
- stub=interfaceName+"Stub";
- }
- Class<?> stubClass;
- try {
- //加载service
- stubClass = ClassHelper.forNameWithThreadContextClassLoader(stub);
- } catch (ClassNotFoundException e) {
- throw new IllegalStateException(e.getMessage(), e);
- }
- if(!interfaceClass.isAssignableFrom(stubClass)){
- throw new IllegalStateException("The stub implemention class " + stubClass.getName() + " not implement interface " + interfaceName);
- }
- }
- //检查application
- checkApplication();
- //检查registries
- checkRegistry();
- //检查protocol
- checkProtocol();
- //将所有这些对象的属性关联到provider
- appendProperties(this);
- checkStubAndMock(interfaceClass);
- if (path == null || path.length() == 0) {
- path = interfaceName;
- }
- //暴露地址
- doExportUrls();
- }
- private void doExportUrls() {
- //将注册的所有url匹配上对应的协议在服务端暴露出来
- List<URL> registryURLs = loadRegistries(true);
- for (ProtocolConfig protocolConfig : protocols) {
- doExportUrlsFor1Protocol(protocolConfig, registryURLs);
- }
- }
- private void doExportUrlsFor1Protocol(ProtocolConfig protocolConfig, List<URL> registryURLs) {
- //如果没配置protocol则默认使用dubbo协议
- String name = protocolConfig.getName();
- if (name == null || name.length() == 0) {
- name = "dubbo";
- }
- //获取主机地址
- String host = protocolConfig.getHost();
- if (provider != null && (host == null || host.length() == 0)) {
- host = provider.getHost();
- }
- boolean anyhost = false;
- if (NetUtils.isInvalidLocalHost(host)) {
- anyhost = true;
- try {
- host = InetAddress.getLocalHost().getHostAddress();
- } catch (UnknownHostException e) {
- logger.warn(e.getMessage(), e);
- }
- if (NetUtils.isInvalidLocalHost(host)) {
- if (registryURLs != null && registryURLs.size() > 0) {
- for (URL registryURL : registryURLs) {
- try {
- //创建socket,连接到注册中心
- Socket socket = new Socket();
- try {
- SocketAddress addr = new InetSocketAddress(registryURL.getHost(), registryURL.getPort());
- socket.connect(addr, 1000);
- //获取服务所在主机地址
- host = socket.getLocalAddress().getHostAddress();
- break;
- } finally {
- try {
- socket.close();
- } catch (Throwable e) {}
- }
- } catch (Exception e) {
- logger.warn(e.getMessage(), e);
- }
- }
- }
- if (NetUtils.isInvalidLocalHost(host)) {
- host = NetUtils.getLocalHost();
- }
- }
- }
- //获取协议接口号
- Integer port = protocolConfig.getPort();
- if (provider != null && (port == null || port == 0)) {
- port = provider.getPort();
- }
- final int defaultPort = ExtensionLoader.getExtensionLoader(Protocol.class).getExtension(name).getDefaultPort();
- if (port == null || port == 0) {
- port = defaultPort;
- }
- if (port == null || port <= 0) {
- port = getRandomPort(name);
- if (port == null || port < 0) {
- port = NetUtils.getAvailablePort(defaultPort);
- putRandomPort(name, port);
- }
- logger.warn("Use random available port(" + port + ") for protocol " + name);
- }
- //获取application、module、provider、protocol、exporter、registries、monitor所有属性
- Map<String, String> map = new HashMap<String, String>();
- if (anyhost) {
- map.put(Constants.ANYHOST_KEY, "true");
- }
- map.put(Constants.SIDE_KEY, Constants.PROVIDER_SIDE);
- map.put(Constants.DUBBO_VERSION_KEY, Version.getVersion());
- map.put(Constants.TIMESTAMP_KEY, String.valueOf(System.currentTimeMillis()));
- if (ConfigUtils.getPid() > 0) {
- map.put(Constants.PID_KEY, String.valueOf(ConfigUtils.getPid()));
- }
- appendParameters(map, application);
- appendParameters(map, module);
- appendParameters(map, provider, Constants.DEFAULT_KEY);
- appendParameters(map, protocolConfig);
- appendParameters(map, this);
- if (methods != null && methods.size() > 0) {
- for (MethodConfig method : methods) {
- appendParameters(map, method, method.getName());
- String retryKey = method.getName() + ".retry";
- if (map.containsKey(retryKey)) {
- String retryValue = map.remove(retryKey);
- if ("false".equals(retryValue)) {
- map.put(method.getName() + ".retries", "0");
- }
- }
- List<ArgumentConfig> arguments = method.getArguments();
- if (arguments != null && arguments.size() > 0) {
- for (ArgumentConfig argument : arguments) {
- //类型自动转换.
- if(argument.getType() != null && argument.getType().length() >0){
- Method[] methods = interfaceClass.getMethods();
- //遍历所有方法
- if(methods != null && methods.length > 0){
- for (int i = 0; i < methods.length; i++) {
- String methodName = methods[i].getName();
- //匹配方法名称,获取方法签名.
- if(methodName.equals(method.getName())){
- Class<?>[] argtypes = methods[i].getParameterTypes();
- //一个方法中单个callback
- if (argument.getIndex() != -1 ){
- if (argtypes[argument.getIndex()].getName().equals(argument.getType())){
- appendParameters(map, argument, method.getName() + "." + argument.getIndex());
- }else {
- throw new IllegalArgumentException("argument config error : the index attribute and type attirbute not match :index :"+argument.getIndex() + ", type:" + argument.getType());
- }
- } else {
- //一个方法中多个callback
- for (int j = 0 ;j<argtypes.length ;j++) {
- Class<?> argclazz = argtypes[j];
- if (argclazz.getName().equals(argument.getType())){
- appendParameters(map, argument, method.getName() + "." + j);
- if (argument.getIndex() != -1 && argument.getIndex() != j){
- throw new IllegalArgumentException("argument config error : the index attribute and type attirbute not match :index :"+argument.getIndex() + ", type:" + argument.getType());
- }
- }
- }
- }
- }
- }
- }
- }else if(argument.getIndex() != -1){
- appendParameters(map, argument, method.getName() + "." + argument.getIndex());
- }else {
- throw new IllegalArgumentException("argument config must set index or type attribute.eg: <dubbo:argument index='0' .../> or <dubbo:argument type=xxx .../>");
- }
- }
- }
- } // end of methods for
- }
- if (ProtocolUtils.isGeneric(generic)) {
- map.put("generic", generic);
- map.put("methods", Constants.ANY_VALUE);
- } else {
- String revision = Version.getVersion(interfaceClass, version);
- if (revision != null && revision.length() > 0) {
- map.put("revision", revision);
- }
- String[] methods = Wrapper.getWrapper(interfaceClass).getMethodNames();
- if(methods.length == 0) {
- logger.warn("NO method found in service interface " + interfaceClass.getName());
- map.put("methods", Constants.ANY_VALUE);
- }
- else {
- map.put("methods", StringUtils.join(new HashSet<String>(Arrays.asList(methods)), ","));
- }
- }
- if (! ConfigUtils.isEmpty(token)) {
- if (ConfigUtils.isDefault(token)) {
- map.put("token", UUID.randomUUID().toString());
- } else {
- map.put("token", token);
- }
- }
- if ("injvm".equals(protocolConfig.getName())) {
- protocolConfig.setRegister(false);
- map.put("notify", "false");
- }
- // 导出服务
- String contextPath = protocolConfig.getContextpath();
- if ((contextPath == null || contextPath.length() == 0) && provider != null) {
- contextPath = provider.getContextpath();
- }
- //创建服务所在url
- URL url = new URL(name, host, port, (contextPath == null || contextPath.length() == 0 ? "" : contextPath + "/") + path, map);
- if (ExtensionLoader.getExtensionLoader(ConfiguratorFactory.class)
- .hasExtension(url.getProtocol())) {
- url = ExtensionLoader.getExtensionLoader(ConfiguratorFactory.class)
- .getExtension(url.getProtocol()).getConfigurator(url).configure(url);
- }
- String scope = url.getParameter(Constants.SCOPE_KEY);
- //配置为none不暴露
- if (! Constants.SCOPE_NONE.toString().equalsIgnoreCase(scope)) {
- //配置不是remote的情况下做本地暴露 (配置为remote,则表示只暴露远程服务)
- if (!Constants.SCOPE_REMOTE.toString().equalsIgnoreCase(scope)) {
- //暴露的地址是localhost所以远端无法访问
- exportLocal(url);
- }
- //如果配置不是local则暴露为远程服务.(配置为local,则表示只暴露远程服务)
- if (! Constants.SCOPE_LOCAL.toString().equalsIgnoreCase(scope) ){
- if (logger.isInfoEnabled()) {
- logger.info("Export dubbo service " + interfaceClass.getName() + " to url " + url);
- }
- if (registryURLs != null && registryURLs.size() > 0
- && url.getParameter("register", true)) {
- for (URL registryURL : registryURLs) {
- url = url.addParameterIfAbsent("dynamic", registryURL.getParameter("dynamic"));
- URL monitorUrl = loadMonitor(registryURL);
- if (monitorUrl != null) {
- url = url.addParameterAndEncoded(Constants.MONITOR_KEY, monitorUrl.toFullString());
- }
- if (logger.isInfoEnabled()) {
- logger.info("Register dubbo service " + interfaceClass.getName() + " url " + url + " to registry " + registryURL);
- }
- //获取invoker
- Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, registryURL.addParameterAndEncoded(Constants.EXPORT_KEY, url.toFullString()));
- //根据协议将invoker暴露成exporter,具体过程是创建一个ExchangeServer,它会绑定一个ServerSocket到配置端口
- Exporter<?> exporter = protocol.export(invoker);
- //将创建的exporter放进链表便于管理
- exporters.add(exporter);
- }
- } else {
- Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, url);
- Exporter<?> exporter = protocol.export(invoker);
- exporters.add(exporter);
- }
- }
- }
- this.urls.add(url);
- }