dubbo学习笔记 五 dubbo-config
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根据上面的路线，我们先来学习下dubbo-config
dubbo-config 分为两部分 dubbo-config-api 和dubbo -config-spring
dubbo-config-api
这里主要是一些抽象的定义，把配置信息定义为类属性
referenceConfig 为依赖 消费端的配置
serviceConfig 为提供 服务端的配置
dubbo -config-spring
这个模块主要将这些配置信息和springBean 来整合起来， 把配置转化为bean 让用户来使用。在看dubbo是如何巧妙的将spring 融合起来的之前，先简单熟悉下spring生命周期
srping 生命周期
ReferenceBean
继承与ReferenceConfig 这是一个FactoryBean 工厂bean 用来生成不同的bean。关键看getObject方法 跟进去看ReferenceConfig的init
看其如何把远程服务包装成依赖的bean
private void init() { if (initialized) { return; } initialized = true; if (interfaceName == null || interfaceName.length() == 0) { throw new IllegalStateException("<dubbo:reference interface=\"\" /> interface not allow null!"); } // 获取消费者全局配置 checkDefault(); appendProperties(this); if (getGeneric() == null && getConsumer() != null) { setGeneric(getConsumer().getGeneric()); } if (ProtocolUtils.isGeneric(getGeneric())) { interfaceClass = GenericService.class; } else { try {interfaceClass = Class.forName(interfaceName, true, Thread.currentThread() .getContextClassLoader());} catch (ClassNotFoundException e) {throw new IllegalStateException(e.getMessage(), e);} checkInterfaceAndMethods(interfaceClass, methods); } String resolve = System.getProperty(interfaceName); String resolveFile = null; if (resolve == null || resolve.length() == 0) { resolveFile = System.getProperty("dubbo.resolve.file"); if (resolveFile == null || resolveFile.length() == 0) { File userResolveFile = new File(new File(System.getProperty("user.home")), "dubbo-resolve.properties"); if (userResolveFile.exists()) { resolveFile = userResolveFile.getAbsolutePath(); } } if (resolveFile != null && resolveFile.length() > 0) { Properties properties = new Properties(); FileInputStream fis = null; try { fis = new FileInputStream(new File(resolveFile));properties.load(fis);} catch (IOException e) {throw new IllegalStateException("Unload " + resolveFile + ", cause: " + e.getMessage(), e);} finally { try { if(null != fis) fis.close(); } catch (IOException e) { logger.warn(e.getMessage(), e); }} resolve = properties.getProperty(interfaceName); } } if (resolve != null && resolve.length() > 0) { url = resolve; if (logger.isWarnEnabled()) { if (resolveFile != null && resolveFile.length() > 0) { logger.warn("Using default dubbo resolve file " + resolveFile + " replace " + interfaceName + "" + resolve + " to p2p invoke remote service."); } else { logger.warn("Using -D" + interfaceName + "=" + resolve + " to p2p invoke remote service."); } } } if (consumer != null) { if (application == null) { application = consumer.getApplication(); } if (module == null) { module = consumer.getModule(); } if (registries == null) { registries = consumer.getRegistries(); } if (monitor == null) { monitor = consumer.getMonitor(); } } 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(); } } checkApplication(); checkStubAndMock(interfaceClass); Map<String, String> map = new HashMap<String, String>(); Map<Object, Object> attributes = new HashMap<Object, Object>(); map.put(Constants.SIDE_KEY, Constants.CONSUMER_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())); } if (! isGeneric()) { 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)), ",")); } } map.put(Constants.INTERFACE_KEY, interfaceName); appendParameters(map, application); appendParameters(map, module); appendParameters(map, consumer, Constants.DEFAULT_KEY); appendParameters(map, this); String prifix = StringUtils.getServiceKey(map); 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"); } } appendAttributes(attributes, method, prifix + "." + method.getName()); checkAndConvertImplicitConfig(method, map, attributes); } } //attributes通过系统context进行存储. StaticContext.getSystemContext().putAll(attributes); ref = createProxy(map); }同时也实现了了InitializingBean的afterPropertiesSet接口
public void afterPropertiesSet() throws Exception { if (getConsumer() == null) { Map<String, ConsumerConfig> consumerConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ConsumerConfig.class, false, false); if (consumerConfigMap != null && consumerConfigMap.size() > 0) { ConsumerConfig consumerConfig = null; for (ConsumerConfig config : consumerConfigMap.values()) { if (config.isDefault() == null || config.isDefault().booleanValue()) { if (consumerConfig != null) { throw new IllegalStateException("Duplicate consumer configs: " + consumerConfig + " and " + config); } consumerConfig = config; } } if (consumerConfig != null) { setConsumer(consumerConfig); } } } if (getApplication() == null && (getConsumer() == null || getConsumer().getApplication() == null)) { 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; } } if (applicationConfig != null) { setApplication(applicationConfig); } } } if (getModule() == null && (getConsumer() == null || getConsumer().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; } } if (moduleConfig != null) { setModule(moduleConfig); } } } if ((getRegistries() == null || getRegistries().size() == 0) && (getConsumer() == null || getConsumer().getRegistries() == null || getConsumer().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); } } if (registryConfigs != null && registryConfigs.size() > 0) { super.setRegistries(registryConfigs); } } } if (getMonitor() == null && (getConsumer() == null || getConsumer().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; } } if (monitorConfig != null) { setMonitor(monitorConfig); } } } Boolean b = isInit(); if (b == null && getConsumer() != null) { b = getConsumer().isInit(); } if (b != null && b.booleanValue()) { getObject(); } }ServiceBean
实现了ApplicationListener 的onApplicationEvent 接口，同时继承ServiceConfig
public void onApplicationEvent(ApplicationEvent event) { if (ContextRefreshedEvent.class.getName().equals(event.getClass().getName())) { if (isDelay() && ! isExported() && ! isUnexported()) { if (logger.isInfoEnabled()) { logger.info("The service ready on spring started. service: " + getInterface()); } export(); } } }同时来看下export,如何把服务发布出去
private void doExportUrlsFor1Protocol(ProtocolConfig protocolConfig, List<URL> registryURLs) { String name = protocolConfig.getName(); if (name == null || name.length() == 0) { name = "dubbo"; } 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 { Socket socket = new Socket(); try { SocketAddress addr = new InetSocketAddress(registryURL.getHost(), registryURL.getPort()); socket.connect(addr, 1000); 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(); } } } 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); } 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(); } 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)) { exportLocal(url); } //如果配置不是local则暴露为远程服务.(配置为local，则表示只暴露本地服务) 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); } Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, registryURL.addParameterAndEncoded(Constants.EXPORT_KEY, url.toFullString())); Exporter<?> exporter = protocol.export(invoker); exporters.add(exporter); } } else { Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, url); Exporter<?> exporter = protocol.export(invoker); exporters.add(exporter); } } } this.urls.add(url); }AnnotationBean
基于注解的bean 如何处理referenceBean和serviceBean的 依赖问题。如何自定义注解，让spring认识呢？
这样基于Service注册的服务，spring就能扫描这些注解，并把这个class初始化为bean了。
Service 实例化化完之后执行 postProcessAfterInitialization 发布服务。
而有依赖Reference的bean, 在实例化之前 执行postProcessBeforeInitialization 实例化bean
shema
用来解析dubbo标签 构造spring bean
public void init() { registerBeanDefinitionParser("application", new DubboBeanDefinitionParser(ApplicationConfig.class, true)); registerBeanDefinitionParser("module", new DubboBeanDefinitionParser(ModuleConfig.class, true)); registerBeanDefinitionParser("registry", new DubboBeanDefinitionParser(RegistryConfig.class, true)); registerBeanDefinitionParser("monitor", new DubboBeanDefinitionParser(MonitorConfig.class, true)); registerBeanDefinitionParser("provider", new DubboBeanDefinitionParser(ProviderConfig.class, true)); registerBeanDefinitionParser("consumer", new DubboBeanDefinitionParser(ConsumerConfig.class, true)); registerBeanDefinitionParser("protocol", new DubboBeanDefinitionParser(ProtocolConfig.class, true)); registerBeanDefinitionParser("service", new DubboBeanDefinitionParser(ServiceBean.class, true)); registerBeanDefinitionParser("reference", new DubboBeanDefinitionParser(ReferenceBean.class, false)); registerBeanDefinitionParser("annotation", new DubboBeanDefinitionParser(AnnotationBean.class, true)); } 0 0
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