1.对某实现BeanDefinition的对象，先实例化，后经过属性填充。
2.DefaultListableBeanFactory对象的initializeBean(...)方法中。
3.调用实现BeanPostProcessor接口的AnnotationAwareAspectJAutoProxyCreator类对象的postProcessAfterInitialization(...)
public class AnnotationAwareAspectJAutoProxyCreator {
//解决代理对象的循环依赖
//将其放入三级缓冲中，对某对象进行赋值操作后调用getEarlyBeanReference()
//方法将代理对象提前暴露处理，等到该实例对象通过AnnotationAwareAspectJAutoProxyCreator类
//创建代理时，发现earlyProxyReferences存在对象名称，就直接返回代理对象
private final Set
4.在创建createProxy(specificInterceptors,...)方法中
//创建proxyFactory，其属性 // aopProxyFactory= new DefaultAopProxyFactory(); 根据该类创建代理对象。 // targetSource 存放对象的实例（为属性赋值）; // advisorChainFactory = new DefaultAdvisorChainFactory(); // advisors 初始化Advisor // 1.@Aspect // Advisor的实现类InstantiationModelAwarePointcutAdvisorImpl // 其属性有pointcut，instantiatedAdvice有AspectJAfterThrowingAdvice // AspectJAfterReturningAdvice，AspectJAfterAdvice，AspectJAroundAdvice // AspectJMethodBeforeAdvice // Advisor的实现类ExposeInvocationInterceptor // 其属性advice ExposeInvocationInterceptor // 2.@Transactional // Advisor的实现类BeanFactoryTransactionAttributeSourceAdvisor // 其属性pointcut, advice =TransactionInterceptor ,beanFactory ProxyFactory proxyFactory = new ProxyFactory();
5.在执行方法时（Aspect拦截的方法），被CglibAopProxy$DynamicAdvisedInterceptor类的实例对象的intercept(...)方法拦截。
// CglibAopProxy$DynamicAdvisedInterceptor类的实例对象属性为 // advised=ProxyFactory的实例对象 // 该方法得到advice // ExposeInvocationInterceptor // AspectJAfterThrowingAdvice // AfterReturningAdviceInterceptor其属性advice=AspectJAfterReturningAdvice // AspectJAfterAdvice // AspectJAroundAdvice // MethodBeforeAdviceInterceptor其属性advice=AspectJMethodBeforeAdvice // 如果是@Transactional，则返回一个值chains= // TransactionInterceptor 其属性beanFactory, // 其属性transactionAttributeSource对应的类AnnotationTransactionAttributeSource List
6.在执行方法时（@Transactional方法），被CglibAopProxy$DynamicAdvisedInterceptor类的实例对象的intercept(...)方法拦截。
//new CglibAopProxy.CglibMethodInvocation(...).proceed()
// 遍历执行interceptorsAndDynamicMethodMatchers
public class TransactionInterceptor {
public Object invoke(MethodInvocation invocation)->{
//其父类TransactionAspectSupport的方法
this.invokeWithinTransaction()->{
//DataSourceTransactionManager对象.doBegin()
//con.setAutoCommit(false);
TransactionAspectSupport.TransactionInfo txInfo =
this.createTransactionIfNecessary(tm, txAttr, joinpointIdentification);
result = null;
try {
//执行方法体
result = invocation.proceedWithInvocation();
} catch (Throwable var17) {
//回滚
this.completeTransactionAfterThrowing(txInfo, var17);
throw var17;
} finally {
//清除ThreadLocal
// transactionInfoHolder
this.cleanupTransactionInfo(txInfo);
}
//提交事务
this.commitTransactionAfterReturning(txInfo);
return result;
}
}
}
// 主要接口方法 Pointcut getPointcut()/getAdvice()
public class BeanFactoryTransactionAttributeSourceAdvisor {
// 值为AnnotationTransactionAttributeSource对象
private TransactionAttributeSource transactionAttributeSource;
// 值为DefaultListableBeanFactory
private BeanFactory beanFactory;
// 值TransactionInterceptor对象t
// 如果该对象t中的 PlatformTransactionManager transactionManager为null，则从对象t的
// transactionManagerCache.get(DEFAULT_TRANSACTION_MANAGER_KEY)
// 如果为null，则beanFactory中得到DataSourceTransactionManager对象，并放入
// transactionManagerCache中key为DEFAULT_TRANSACTION_MANAGER_KEY
// 用ProxyFactory对象的方法getInterceptorsAndDynamicInterceptionAdvice(
// method，targetClass)得到TransactionInterceptor对象
// 使用TransactionInterceptor对象.invokeWithinTransaction(...)
private transient volatile Advice advice;
}
//spring事务注解属性资源
public class AnnotationTransactionAttributeSource{
//解析公共方法
private final boolean publicMethodsOnly = true;
//值为SpringTransactionAnnotationParser
//SpringTransactionAnnotationParser.parseTransactionAnnotation(AnnotatedElement ae)
//方法: 解析类方法上的@Transaction的属性赋值给RuleBasedTransactionAttribute对象
private final Set annotationParsers；
//储存带有@Transaction注解方法
// key MethodClassKey类
// value DefaultTransactionAttribute=PROPAGATION_REQUIRED,ISOLATION_DEFAULT
// RuleBasedTransactionAttribute
private final Map attributeCache;
}
public interface TransactionDefinition {
int PROPAGATION_REQUIRED = 0;
int PROPAGATION_SUPPORTS = 1;
int PROPAGATION_MANDATORY = 2;
int PROPAGATION_REQUIRES_NEW = 3;
int PROPAGATION_NOT_SUPPORTED = 4;
int PROPAGATION_NEVER = 5;
int PROPAGATION_NESTED = 6;
int ISOLATION_DEFAULT = -1;
int ISOLATION_READ_UNCOMMITTED = 1;
int ISOLATION_READ_COMMITTED = 2;
int ISOLATION_REPEATABLE_READ = 4;
int ISOLATION_SERIALIZABLE = 8;
int TIMEOUT_DEFAULT = -1;
}
TransactionAspectSupport.TransactionInfo 其属性
transactionManager=DataSourceTransactionManager对象
transactionAttribute=PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
joinpointIdentification=org.sang.security01.OrderService.setOrder某方法
transactionStatus=DefaultTransactionStatus对象
this$0=TransactionInterceptor对象
