Spring Aop初始化源码分析

àì夳堔傛蜴生んèń 2022-11-12 01:47 191阅读 0赞

# 引言 #

**概述：** AOP系列文章：  
[【1】Spring Aop初始化源码分析][1_Spring Aop]  
[【2】Spring AOP创建代理对象源码解析][2_Spring AOP]  
[【3】Spring AOP 链式调用过程源码解析][3_Spring AOP]  
[【4】Spring 事务执行过程源码解析][4_Spring]

# 1 工程简介 #

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## 1.1 pom ##

<properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <spring.version>5.2.8.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.20</version>
            </dependency>
            
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.10</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.1.2</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.1.2</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${ spring.version}</version>
            </dependency>
        </dependencies>

## 1.2 AopConfig ##

@Configuration
    @EnableAspectJAutoProxy
    @Aspect
    public class AopConfig { 
    
        /** * 声明切点 */
        @Pointcut("execution(* com.rosh.service.*.*(..))")
        public void pointCut() { 
    
        }
    
        @Around("pointCut()")
        public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable { 
            System.out.println("==============调用前=================");
            Object proceed = proceedingJoinPoint.proceed();
            System.out.println("==============调用后=================");
            return proceed;
        }
    
    
    }

## 1.3 StudentService ##

@Service
    public class StudentService { 
    
        public void addStudent() { 
            System.out.println("添加学生");
        }
    
    
    }

## 1.4 RoshTest ##

public class RoshTest { 
    
        @Test
        public void mainTest(){ 
    
            AnnotationConfigApplicationContext applicationContext=new AnnotationConfigApplicationContext("com.rosh");
    
            StudentService studentService = (StudentService) applicationContext.getBean("studentService");
    
            studentService.addStudent();
    
        }
    
    }

## 1.5 运行结果 ##

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# 2 @EnableAspectJAutoProxy作用 #

**描述：** 开启Spring AOP功能。

(1) IOC中加入AspectJAutoProxyRegistrar.class  
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(2) 注册 AnnotationAwareAspectJAutoProxyCreator.class  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 3]

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# 3 AnnotationAwareAspectJAutoProxyCreator.class 源码分析 #

**描述：** 该类是AOP核心类。该类实现了BeanPostProcessor接口，说明在bean初始化时，进行后置加强。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 6]  
该类作用是，当bean初始化时，被该类后置加强：

(1) 查找有效的advisor列表。(advisor=advice+pointCut)
    (2) 匹配当前bean，是否在pointCut表达式范围，匹配方法是否需要加强，把匹配到的advisor列表返回。
    (3) 根据有效的advisor列表创建代理对象、

## 3.1 后置加强逻辑 ##

@Override
    	public Object postProcessAfterInitialization(@Nullable Object bean, String beanName) { 
    		if (bean != null) { 
    			Object cacheKey = getCacheKey(bean.getClass(), beanName);
    			if (this.earlyProxyReferences.remove(cacheKey) != bean) { 
    				return wrapIfNecessary(bean, beanName, cacheKey);
    			}
    		}
    		return bean;
    	}

## 3.2 wrapIfNecessary方法 ##

protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) { 
    		if (StringUtils.hasLength(beanName) && this.targetSourcedBeans.contains(beanName)) { 
    			return bean;
    		}
    		if (Boolean.FALSE.equals(this.advisedBeans.get(cacheKey))) { 
    			return bean;
    		}
    		if (isInfrastructureClass(bean.getClass()) || shouldSkip(bean.getClass(), beanName)) { 
    			this.advisedBeans.put(cacheKey, Boolean.FALSE);
    			return bean;
    		}
    
    		// Create proxy if we have advice.
    		/** * 【1】获取当前bean有效的Advisor，Advisor = advice + pointCut */
    		Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);
    
    		if (specificInterceptors != DO_NOT_PROXY) { 
    			this.advisedBeans.put(cacheKey, Boolean.TRUE);
    
    			/** * 【2】创建代理对象 */
    			Object proxy = createProxy(
    					bean.getClass(), beanName, specificInterceptors, new SingletonTargetSource(bean));
    			this.proxyTypes.put(cacheKey, proxy.getClass());
    			return proxy;
    		}
    
    		this.advisedBeans.put(cacheKey, Boolean.FALSE);
    		return bean;
    	}

## 3.3 getAdvicesAndAdvisorsForBean 方法解析 ##

@Override
    	@Nullable
    	protected Object[] getAdvicesAndAdvisorsForBean(
    			Class<?> beanClass, String beanName, @Nullable TargetSource targetSource) { 
    
    		/** * 查找Advisor */
    		List<Advisor> advisors = findEligibleAdvisors(beanClass, beanName);
    		if (advisors.isEmpty()) { 
    			return DO_NOT_PROXY;
    		}
    		return advisors.toArray();
    	}

**描述：** 该方法获取有效的Advisor，主要作用，发现所有的advisor其次匹配当前bean。

protected List<Advisor> findEligibleAdvisors(Class<?> beanClass, String beanName) { 
    
    		/** * 【1】找到工程中所有Advisor（解析带有@Aspect注解类生成Advisor对象） */
    		List<Advisor> candidateAdvisors = findCandidateAdvisors();
    
    		/** * 【2】 匹配当前类 */
    		List<Advisor> eligibleAdvisors = findAdvisorsThatCanApply(candidateAdvisors, beanClass, beanName);
    		extendAdvisors(eligibleAdvisors);
    		if (!eligibleAdvisors.isEmpty()) { 
    			eligibleAdvisors = sortAdvisors(eligibleAdvisors);
    		}
    		return eligibleAdvisors;
    	}

### 3.3.1 findCandidateAdvisors ###

**作用：** 查找所有的advisor。

@Override
    	protected List<Advisor> findCandidateAdvisors() { 
    		// Add all the Spring advisors found according to superclass rules.
    		//找到所有的Advisor
    		List<Advisor> advisors = super.findCandidateAdvisors();
    		// Build Advisors for all AspectJ aspects in the bean factory.
    
    		/** * 创建候选切面 对@Aspect注解进行处理 */
    		if (this.aspectJAdvisorsBuilder != null) { 
    			advisors.addAll(this.aspectJAdvisorsBuilder.buildAspectJAdvisors());
    		}
    		return advisors;
    	}

**核心方法：** buildAspectJAdvisors()

public List<Advisor> buildAspectJAdvisors() { 
    		List<String> aspectNames = this.aspectBeanNames;
    
    		if (aspectNames == null) { 
    			synchronized (this) { 
    				aspectNames = this.aspectBeanNames;
    				if (aspectNames == null) { 
    					List<Advisor> advisors = new ArrayList<>();
    					aspectNames = new ArrayList<>();
    
    					/** * 从spring 中获取所有的类 */
    					String[] beanNames = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(
    							this.beanFactory, Object.class, true, false);
    					for (String beanName : beanNames) { 
    						if (!isEligibleBean(beanName)) { 
    							continue;
    						}
    						// We must be careful not to instantiate beans eagerly as in this case they
    						// would be cached by the Spring container but would not have been weaved.
    
    						/** * 获取beanName 的class */
    						Class<?> beanType = this.beanFactory.getType(beanName);
    						if (beanType == null) { 
    							continue;
    						}
    
    						/** * 判断类上是否有@Aspect注解 */
    						if (this.advisorFactory.isAspect(beanType)) { 
    							aspectNames.add(beanName);
    							AspectMetadata amd = new AspectMetadata(beanType, beanName);
    							if (amd.getAjType().getPerClause().getKind() == PerClauseKind.SINGLETON) { 
    
    								//创建获取有@Aspect注解类的实例工厂，负责获取有@Aspect注解的实例
    								MetadataAwareAspectInstanceFactory factory =
    										new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName);
    
    								//创建切面Advisor对象
    								List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory);
    								if (this.beanFactory.isSingleton(beanName)) { 
    									this.advisorsCache.put(beanName, classAdvisors);
    								}
    								else { 
    									this.aspectFactoryCache.put(beanName, factory);
    								}
    								advisors.addAll(classAdvisors);
    							}
    							else { 
    								// Per target or per this.
    								if (this.beanFactory.isSingleton(beanName)) { 
    									throw new IllegalArgumentException("Bean with name '" + beanName +
    											"' is a singleton, but aspect instantiation model is not singleton");
    								}
    								MetadataAwareAspectInstanceFactory factory =
    										new PrototypeAspectInstanceFactory(this.beanFactory, beanName);
    								this.aspectFactoryCache.put(beanName, factory);
    								advisors.addAll(this.advisorFactory.getAdvisors(factory));
    							}
    						}
    					}
    					this.aspectBeanNames = aspectNames;
    					return advisors;
    				}
    			}
    		}
    
    		if (aspectNames.isEmpty()) { 
    			return Collections.emptyList();
    		}
    		List<Advisor> advisors = new ArrayList<>();
    		for (String aspectName : aspectNames) { 
    			List<Advisor> cachedAdvisors = this.advisorsCache.get(aspectName);
    			if (cachedAdvisors != null) { 
    				advisors.addAll(cachedAdvisors);
    			}
    			else { 
    				MetadataAwareAspectInstanceFactory factory = this.aspectFactoryCache.get(aspectName);
    				advisors.addAll(this.advisorFactory.getAdvisors(factory));
    			}
    		}
    		return advisors;
    	}

### 3.3.2 findAdvisorsThatCanApply ###

**描述：** 用所有advisor匹配当前class获取当前类有效的advisor列表。

protected List<Advisor> findAdvisorsThatCanApply(
    			List<Advisor> candidateAdvisors, Class<?> beanClass, String beanName) { 
    
    		ProxyCreationContext.setCurrentProxiedBeanName(beanName);
    		try { 
    			/** * 判断当前类是否在这些切面的pointCut中 */
    			return AopUtils.findAdvisorsThatCanApply(candidateAdvisors, beanClass);
    		}
    		finally { 
    			ProxyCreationContext.setCurrentProxiedBeanName(null);
    		}
    	}

**描述：** 找到有效的Advisor后匹配当前bean是否需要加强

public static List<Advisor> findAdvisorsThatCanApply(List<Advisor> candidateAdvisors, Class<?> clazz) { 
    		if (candidateAdvisors.isEmpty()) { 
    			return candidateAdvisors;
    		}
    		List<Advisor> eligibleAdvisors = new ArrayList<>();
    		for (Advisor candidate : candidateAdvisors) { 
    			if (candidate instanceof IntroductionAdvisor && canApply(candidate, clazz)) { 
    				eligibleAdvisors.add(candidate);
    			}
    		}
    		boolean hasIntroductions = !eligibleAdvisors.isEmpty();
    
    		/** * 匹配 */
    		for (Advisor candidate : candidateAdvisors) { 
    			if (candidate instanceof IntroductionAdvisor) { 
    				// already processed
    				continue;
    			}
    
    			/** * 判断当前类、方法是否匹配PointCut，如果匹配，把有效切面存入eligibleAdvisors */
    			if (canApply(candidate, clazz, hasIntroductions)) { 
    				eligibleAdvisors.add(candidate);
    			}
    		}
    		return eligibleAdvisors;
    	}

**描述：** 真正匹配方法，判断当前类是否在pointCut表达式中，在匹配当前方法是否需要加强。

public static boolean canApply(Pointcut pc, Class<?> targetClass, boolean hasIntroductions) { 
    		Assert.notNull(pc, "Pointcut must not be null");
    
    		/** * 【1】判断当前类是否匹配Pointcut */
    		if (!pc.getClassFilter().matches(targetClass)) { 
    			return false;
    		}
    
    		MethodMatcher methodMatcher = pc.getMethodMatcher();
    		if (methodMatcher == MethodMatcher.TRUE) { 
    			// No need to iterate the methods if we're matching any method anyway...
    			return true;
    		}
    
    		IntroductionAwareMethodMatcher introductionAwareMethodMatcher = null;
    		if (methodMatcher instanceof IntroductionAwareMethodMatcher) { 
    			introductionAwareMethodMatcher = (IntroductionAwareMethodMatcher) methodMatcher;
    		}
    
    		Set<Class<?>> classes = new LinkedHashSet<>();
    		if (!Proxy.isProxyClass(targetClass)) { 
    			classes.add(ClassUtils.getUserClass(targetClass));
    		}
    		classes.addAll(ClassUtils.getAllInterfacesForClassAsSet(targetClass));
    
    		/** * 【2】 判断类中方法是否匹配 */
    		for (Class<?> clazz : classes) { 
    			Method[] methods = ReflectionUtils.getAllDeclaredMethods(clazz);
    			for (Method method : methods) { 
    				if (introductionAwareMethodMatcher != null ?
    						introductionAwareMethodMatcher.matches(method, targetClass, hasIntroductions) :
    						methodMatcher.matches(method, targetClass)) { 
    					return true;
    				}
    			}
    		}
    
    		return false;
    	}

# 4 buildAspectJAdvisors() 方法debug #

**描述：** 该方法是获取当前项目中所有advisor。一个advisor由pointCut和advice组成，代表一个切面。

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**描述：** 创建pointCut对象

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**描述：** 创建advisor对象，传入参数pointCut。advisor创建时，会创建内部advice对象。  
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**描述：** 创建advice  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 12]  
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# 5 匹配流程debug #

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**描述：** 匹配类，切点进入当前类，在matches方法中，会把切点转成表达式。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 19]  
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**描述：** 如果类、方法都匹配advisor，那么当前advisor可以加强当前bean  
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[1_Spring Aop]: https://blog.csdn.net/qq_34125999/article/details/115057552
[2_Spring AOP]: https://blog.csdn.net/qq_34125999/article/details/115107521
[3_Spring AOP]: https://blog.csdn.net/qq_34125999/article/details/115155125
[4_Spring]: https://blog.csdn.net/qq_34125999/article/details/115220975
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