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  • springAOP分析

    参考https://www.cnblogs.com/liuyk-code/p/9886033.html

    在springboot中自动引入了配置文件AopAutoConfiguration

    @Configuration
    @ConditionalOnClass({ EnableAspectJAutoProxy.class, Aspect.class, Advice.class,
            AnnotatedElement.class })
    @ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
    public class AopAutoConfiguration {
    
        @Configuration
        @EnableAspectJAutoProxy(proxyTargetClass = false)
        @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false", matchIfMissing = false)
        public static class JdkDynamicAutoProxyConfiguration {
    
        }
    
        @Configuration
        @EnableAspectJAutoProxy(proxyTargetClass = true)
        @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true", matchIfMissing = true)
        public static class CglibAutoProxyConfiguration {
    
        }
    
    }

    满足条件的时候有引入了EnableAspectJAutoProxy

    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Import(AspectJAutoProxyRegistrar.class)
    public @interface EnableAspectJAutoProxy {
    
        /**
         * Indicate whether subclass-based (CGLIB) proxies are to be created as opposed
         * to standard Java interface-based proxies. The default is {@code false}.
         */
        boolean proxyTargetClass() default false;
    
        /**
         * Indicate that the proxy should be exposed by the AOP framework as a {@code ThreadLocal}
         * for retrieval via the {@link org.springframework.aop.framework.AopContext} class.
         * Off by default, i.e. no guarantees that {@code AopContext} access will work.
         * @since 4.3.1
         */
        boolean exposeProxy() default false;
    
    }

    这个AspectJAutoProxyRegistrar在刷新容器的时候BeanPostProcessor后置处理器,在bean创建后执行这个后置处理器看是否需要AOP代理

    class AspectJAutoProxyRegistrar implements ImportBeanDefinitionRegistrar {
    
        /**
         * Register, escalate, and configure the AspectJ auto proxy creator based on the value
         * of the @{@link EnableAspectJAutoProxy#proxyTargetClass()} attribute on the importing
         * {@code @Configuration} class.
         */
        @Override
        public void registerBeanDefinitions(
                AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
    
            AopConfigUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(registry);
    
            AnnotationAttributes enableAspectJAutoProxy =
                    AnnotationConfigUtils.attributesFor(importingClassMetadata, EnableAspectJAutoProxy.class);
            if (enableAspectJAutoProxy != null) {
                if (enableAspectJAutoProxy.getBoolean("proxyTargetClass")) {
                    AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);
                }
                if (enableAspectJAutoProxy.getBoolean("exposeProxy")) {
                    AopConfigUtils.forceAutoProxyCreatorToExposeProxy(registry);
                }
            }
        }
    
    }

    继承跟踪到AopConfigUtils#registerAspectJAnnotationAutoProxyCreatorIfNecessary

        @Nullable
        public static BeanDefinition registerAspectJAnnotationAutoProxyCreatorIfNecessary(BeanDefinitionRegistry registry,
                @Nullable Object source) {
    
            return registerOrEscalateApcAsRequired(AnnotationAwareAspectJAutoProxyCreator.class, registry, source);
        }
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  • 原文地址:https://www.cnblogs.com/grasp/p/11978138.html
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