[GitHub] [dubbo] changfubai edited a comment on issue #829: spring 配置文件中 配置default-lazy-init="true" 时 dubbo扫描不起作用？？

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changfubai edited a comment on issue #829:
URL: https://github.com/apache/dubbo/issues/829#issuecomment-922628738


   > For this issue, there are two aspects we need to consider as follows
   > 
   > * **XML configuration supports lazy initialization or not**
   >   For XML configuration, we need to consider `default-lazy-init` in `beans` and `lazy-init` in the specified `bean`,  see them as below:
   >   ```java
   >   <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   >          xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
   >          xmlns="http://www.springframework.org/schema/beans"
   >          xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
   >       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd" default-lazy-init="true"> // default-lazy-init
   >   
   >       <dubbo:application name="application"/>
   >   
   >       <!-- service configuration -->
   >       <dubbo:service interface="org.apache.dubbo.config.spring.api.DemoService" ref="demoService"/>
   >   		// lazy-init for the specified bean
   >       <bean id="demoService" class="org.apache.dubbo.config.spring.impl.DemoServiceImpl" lazy-init="true"/>
   >   
   >   </beans>
   >   ```
   >   
   >   
   >       
   >         
   >       
   >   
   >         
   >       
   >   
   >       
   >     
   >   If the `bean` is referenced by `dubbo:service` , which cannot be lazy initialized no matter `default-lazy-init` or `lazy-init` sets `true`, because `dubbo:service` don't support lazy initialization.
   >   `DubboBeanDefinitionParser` will parse all beans like `dubbo:xxx`. There seems to be no problem here, if all of them don't support lazy initialization(there are no `lazy-init` attribute).
   >   ```java
   >   RootBeanDefinition beanDefinition = new RootBeanDefinition();
   >   beanDefinition.setBeanClass(beanClass);
   >   beanDefinition.setLazyInit(false); // There is no problem here, beause all of dubbo:xxx bean don't support lazy-init attribute
   >   ```
   > 
   > We can dissucss if all of `dubbo:xxx ` beans need to support `lazy-init` attribute
   > 
   > * **Annotation configuration supports lazy initialization or not**
   >   I have tested that Lazy annotation don't support and I have fix this issue. see [fix: Support Lazy annotation #7981](https://github.com/apache/dubbo/pull/7981)
   
   @pinxiong 
   大佬您好，我在您提完#7981 后，发现如果在privoder实现类上加上@Lazy时，provider就不会暴露到注册中心去了#8770，
   按您这里的描述，provider应该是不支持@Lazy的，只是consumer侧支持对吧？
   目前看应该是下图中把provider加上了@Lazy，导致provider延迟加载，没有触发ServiceConfig的export方法，从而没有注册到注册中心去。
   ![image](https://user-images.githubusercontent.com/20989201/133956805-b9671cd0-f053-469f-a81c-c4c8618f499c.png)
   
   目前我的改法是，去掉service的@Lazy标记。
   您看我的理解是对的么？  


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