update spring-aop README.md spring-projects#1

FadeDemo · Mar 29, 2022 · 5574de7 · 5574de7
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diff --git a/spring-aop/doc/README.md b/spring-aop/doc/README.md
@@ -4,3 +4,34 @@
 
 todo
 
+### 几种通知类型的执行顺序
+
+todo
+
+### AOP的整个流程
+
+XML方式（以测试资源目录下的 `aopExample.xml` 中的 `testBean` 的获取为例 ）：
+
+1. 解析XML文件时，在 `AopNamespaceHandler#init` 中注册 `<aop:aspectj-autoproxy />` 标签对应的解析器 `AspectJAutoProxyBeanDefinitionParser`
+
+![aop#1](resources/2022-03-29_21-19.png)
+
+2. 调用 `AspectJAutoProxyBeanDefinitionParser#parse` 方法注册 `AnnotationAwareAspectJAutoProxyCreator` 
+
+![aop#2](resources/2022-03-29_21-26.png)
+
+3. 因为 `AnnotationAwareAspectJAutoProxyCreator` 实现了 `BeanPostProcessor` 接口，所以会在 `AbstractApplicationContext#registerBeanPostProcessors` 中把它注册到 `AbstractBeanFactory` 的 `beanPostProcessors` 属性中
+
+![aop#3](resources/2022-03-29_21-41.png)
+
+4. 又因为 `AnnotationAwareAspectJAutoProxyCreator` 实现的是 `BeanPostProcessor` 的子接口 `InstantiationAwareBeanPostProcessor` ，所以在获取bean时，它的 `applyBeanPostProcessorsBeforeInstantiation` 方法和 `applyBeanPostProcessorsAfterInitialization` 方法会被 `AbstractAutowireCapableBeanFactory#resolveBeforeInstantiation` 调用
+
+![aop#4](resources/2022-03-29_21-54.png)
+
+5. 
+
+### AOP概念与Spring中实现的对应关系
+
+* 切面 —— `@Aspect` 注解、 `Advisor` 接口及其实现类
+* 通知 —— `Advice` 接口及其实现类、 `@Before` 、 `@After` 、 `@Around` 、 `@AfterThrowing` 、 `@AfterReturing` 注解
+* 
diff --git a/spring-aop/doc/resources/2022-03-29_21-19.png b/spring-aop/doc/resources/2022-03-29_21-19.png
diff --git a/spring-aop/doc/resources/2022-03-29_21-26.png b/spring-aop/doc/resources/2022-03-29_21-26.png
diff --git a/spring-aop/doc/resources/2022-03-29_21-41.png b/spring-aop/doc/resources/2022-03-29_21-41.png
diff --git a/spring-aop/doc/resources/2022-03-29_21-54.png b/spring-aop/doc/resources/2022-03-29_21-54.png
diff --git a/spring-context/src/main/java/org/springframework/context/weaving/AspectJWeavingEnabler.java b/spring-context/src/main/java/org/springframework/context/weaving/AspectJWeavingEnabler.java
@@ -97,6 +97,10 @@ public static void enableAspectJWeaving(
 				throw new IllegalStateException("No LoadTimeWeaver available");
 			}
 		}
+		/**
+		 * <p>使用 {@link DefaultContextLoadTimeWeaver} 类型bean中的
+		 * {@link DefaultContextLoadTimeWeaver#loadTimeWeaver} 属性注册转换器</p>
+		 * */
 		weaverToUse.addTransformer(
 				new AspectJClassBypassingClassFileTransformer(new ClassPreProcessorAgentAdapter()));
 	}
@@ -118,10 +122,11 @@ public AspectJClassBypassingClassFileTransformer(ClassFileTransformer delegate)
 		@Override
 		public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
 				ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
-
+			// 以org.aspectj或org/aspectj开头的类不进行处理
 			if (className.startsWith("org.aspectj") || className.startsWith("org/aspectj")) {
 				return classfileBuffer;
 			}
+			// 委托给AspectJ代理继续处理
 			return this.delegate.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
 		}
 	}