/**
 * TODO 自定義BeanFactoryPostProcessor
 *      執(zhí)行時(shí)間:所有的Bean定義信息已經(jīng)加載到容器中，但是Bean實(shí)例還沒(méi)有被初始化.
 *
 * @author : lzb
 * @date: 2021-03-15 17:42
 */
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("IOC 容器調(diào)用了MyBeanFactoryPostProcessor中重寫的postProcessBeanFactory方法");
        for(String name:beanFactory.getBeanDefinitionNames()) {
            if("person".equals(name)) {
                System.out.println("將Person對(duì)象設(shè)置為懶加載");
                BeanDefinition beanDefinition = beanFactory.getBeanDefinition(name);
                beanDefinition.setLazyInit(true);
            }
        }
    }
}

/**
 * 定義一個(gè)主配置類，標(biāo)識(shí)為@Configuration，通過(guò)@Bean方式初始化，注入IOC容器
 */
@Configuration
public class MainConfig {

	@Bean
	public MyBeanFactoryPostProcessor myBeanFactoryPostProcessor  () {
		return new MyBeanFactoryPostProcessor();
	}
}

/**
 * 使用@ComponentScan定義組件掃描包范圍，在可掃描的保范圍內(nèi)，
 * 然后使用@Component方式，將其定義為一個(gè)組件初始化，注入IOC容器
 */
@Component
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("IOC 容器調(diào)用了MyBeanFactoryPostProcessor中重寫的postProcessBeanFactory方法");
		// 獲取Bean定義名稱，進(jìn)行遍歷
        for(String name:beanFactory.getBeanDefinitionNames()) {
			// 如果是person對(duì)象
            if("person".equals(name)) { 
                System.out.println("將Person對(duì)象設(shè)置為懶加載");
                // 獲取person的BeanDefinition(Bean定義對(duì)象)
                BeanDefinition beanDefinition = beanFactory.getBeanDefinition(name); 
                // 將Person對(duì)象設(shè)置為懶加載
                beanDefinition.setLazyInit(true);   
            }
        }
    }
}