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This article mainly introduces "the specific usage of DubboApplicationContextInitializer in dubbo". In daily operation, I believe many people have doubts about the specific usage of DubboApplicationContextInitializer in dubbo. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "the specific usage of DubboApplicationContextInitializer in dubbo"! Next, please follow the editor to study!

DubboApplicationContextInitializer

Dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/autoconfigure/src/main/java/org/apache/dubbo/spring/boot/context/DubboApplicationContextInitializer.java

Public class DubboApplicationContextInitializer implements ApplicationContextInitializer, Ordered {@ Override public void initialize (ConfigurableApplicationContext applicationContext) {overrideBeanDefinitions (applicationContext);} private void overrideBeanDefinitions (ConfigurableApplicationContext applicationContext) {applicationContext.addBeanFactoryPostProcessor (new OverrideBeanDefinitionRegistryPostProcessor ()); applicationContext.addBeanFactoryPostProcessor (new DubboConfigBeanDefinitionConflictProcessor ());} @ Override public int getOrder () {return HIGHEST_PRECEDENCE;}}

DubboApplicationContextInitializer implements ApplicationContextInitializer, Ordered interface, and the initialize method executes overrideBeanDefinitions. It adds OverrideBeanDefinitionRegistryPostProcessor to applicationContext, and DubboConfigBeanDefinitionConflictProcessor;getOrder returns HIGHEST_PRECEDENCE.

OverrideBeanDefinitionRegistryPostProcessor

Dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/autoconfigure/src/main/java/org/apache/dubbo/spring/boot/beans/factory/config/OverrideBeanDefinitionRegistryPostProcessor.java

Public class OverrideBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {@ Override public void postProcessBeanDefinitionRegistry (BeanDefinitionRegistry registry) throws BeansException {registerInfrastructureBean (registry, BEAN_NAME, DubboConfigBeanCustomizer.class);} @ Override public void postProcessBeanFactory (ConfigurableListableBeanFactory beanFactory) throws BeansException {}}

OverrideBeanDefinitionRegistryPostProcessor implements the BeanDefinitionRegistryPostProcessor interface, and its postProcessBeanDefinitionRegistry method calls the BeanRegistrar.registerInfrastructureBean method to register DubboConfigBeanCustomizer

BeanRegistrar

Dubboth2.7.3Mutual sources.jarpickplicorgUnixapacheanddubboqqqqingLigandutillyBeanRegistrar.java

Public class BeanRegistrar {/ * Register InfrastructureBean * * @ param beanDefinitionRegistry {@ link BeanDefinitionRegistry} * @ param beanType the type of bean * @ param beanName the name of bean * / public static void registerInfrastructureBean (BeanDefinitionRegistry beanDefinitionRegistry, String beanName Class beanType) {if (! beanDefinitionRegistry.containsBeanDefinition (beanName)) {RootBeanDefinition beanDefinition = new RootBeanDefinition (beanType) BeanDefinition.setRole (BeanDefinition.ROLE_INFRASTRUCTURE); beanDefinitionRegistry.registerBeanDefinition (beanName, beanDefinition);}

RegisterInfrastructureBean registers BeanDefinition.ROLE_INFRASTRUCTURE 's bean if beanDefinitionRegistry does not have the beanDefinition.

DubboConfigBeanCustomizer

Dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/autoconfigure/src/main/java/org/apache/dubbo/spring/boot/beans/factory/config/DubboConfigBeanCustomizer.java

@ Deprecatedclass DubboConfigBeanCustomizer extends NamePropertyDefaultValueDubboConfigBeanCustomizer {@ Override public void customize (String beanName, AbstractConfig dubboConfigBean) {boolean valid = isValidPropertyName (dubboConfigBean, beanName); if (valid) {super.customize (beanName, dubboConfigBean);}} private boolean isValidPropertyName (AbstractConfig dubboConfigBean, String propertyValue) {boolean valid = true; String propertyName = "name" / AbstractConfig.checkName (String,String) Method method = findMethod (AbstractConfig.class, "checkName", String.class, String.class); try {if (! method.isAccessible ()) {method.setAccessible (true);} if (BeanUtils.getPropertyDescriptor (dubboConfigBean.getClass (), propertyName)! = null) {invokeMethod (method, null, propertyName, propertyValue) } catch (IllegalStateException e) {valid = false;} return valid;}}

DubboConfigBeanCustomizer inherits NamePropertyDefaultValueDubboConfigBeanCustomizer, and its customize method verifies propertyName first, and executes the customize method of the parent class only in the case of valid.

DubboConfigBeanDefinitionConflictProcessor

Dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/autoconfigure/src/main/java/org/apache/dubbo/spring/boot/beans/factory/config/DubboConfigBeanDefinitionConflictProcessor.java

Public class DubboConfigBeanDefinitionConflictProcessor implements BeanDefinitionRegistryPostProcessor, Ordered {private final Logger logger = LoggerFactory.getLogger (getClass ()); private BeanDefinitionRegistry registry; private Environment environment; @ Override public void postProcessBeanDefinitionRegistry (BeanDefinitionRegistry registry) throws BeansException {this.registry = registry;} @ Override public void postProcessBeanFactory (ConfigurableListableBeanFactory beanFactory) throws BeansException {resolveUniqueApplicationConfigBean (registry, beanFactory) } / * * Resolve the unique {@ link ApplicationConfig} Bean * * @ param registry {@ link BeanDefinitionRegistry} instance * @ param beanFactory {@ link ConfigurableListableBeanFactory} instance * @ see EnableDubboConfig * / private void resolveUniqueApplicationConfigBean (BeanDefinitionRegistry registry, ConfigurableListableBeanFactory beanFactory) {this.environment = beanFactory.getBean (ENVIRONMENT_BEAN_NAME, Environment.class) String [] beansNames = beanNamesForTypeIncludingAncestors (beanFactory, ApplicationConfig.class); if (beansNames.length

< 2) { // If the number of ApplicationConfig beans is less than two, return immediately. return; } // Remove ApplicationConfig Beans that are configured by "dubbo.application.*" Stream.of(beansNames) .filter(this::isConfiguredApplicationConfigBeanName) .forEach(registry::removeBeanDefinition); beansNames = beanNamesForTypeIncludingAncestors(beanFactory, ApplicationConfig.class); if (beansNames.length >

1) {throw new IllegalStateException (String.format ("There are more than one instances of% s, whose bean definitions:% s", ApplicationConfig.class.getSimpleName (), Stream.of (beansNames) .map (registry::getBeanDefinition) .targets (Collectors.toList () }} private boolean isConfiguredApplicationConfigBeanName (String beanName) {boolean removed = BeanFactoryUtils.isGeneratedBeanName (beanName) / / Dubbo ApplicationConfig id as bean name | | Objects.equals (beanName, environment.getProperty ("dubbo.application.id")) If (removed) {if (logger.isWarnEnabled ()) {logger.warn ("The {} bean [name: {}] has been removed!", ApplicationConfig.class.getSimpleName (), beanName);} return removed;} @ Override public int getOrder () {return LOWEST_PRECEDENCE;}}

DubboConfigBeanDefinitionConflictProcessor implements BeanDefinitionRegistryPostProcessor and Ordered interface; the postProcessBeanFactory method executes resolveUniqueApplicationConfigBean to verify whether there are multiple instances of the same beanDefinition, and if so, it throws IllegalStateException;getOrder and returns LOWEST_PRECEDENCE.

Summary

DubboApplicationContextInitializer implements ApplicationContextInitializer, Ordered interface, and the initialize method executes overrideBeanDefinitions. It adds OverrideBeanDefinitionRegistryPostProcessor to applicationContext, and DubboConfigBeanDefinitionConflictProcessor;getOrder returns HIGHEST_PRECEDENCE.

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