Spring 事务执行过程源码解析

阳光穿透心脏的1/2处 2022-11-13 05:27 269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 #

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## 1.1 数据库 ##

![在这里插入图片描述][20210325225324377.png]

CREATE TABLE `t_student` (
      `c_id` int(11) NOT NULL AUTO_INCREMENT,
      `c_name` varchar(255) DEFAULT NULL,
      `c_age` int(12) DEFAULT NULL,
      PRIMARY KEY (`c_id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

## 1.2 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>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</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>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.44</version>
            </dependency>
            <dependency>
                <groupId>c3p0</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.1.2</version>
            </dependency>
        </dependencies>

## 1.3 SpringConfig ##

@Configuration
    @EnableTransactionManagement
    public class SpringConfig { 
        //创建数据源
        @Bean
        public DataSource dataSource() throws PropertyVetoException { 
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            dataSource.setUser("root");
            dataSource.setPassword("123456");
            dataSource.setDriverClass("com.mysql.jdbc.Driver");
            dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
            return dataSource;
        }
    
        /** * JDBC */
        @Bean
        public JdbcTemplate jdbcTemplate() throws PropertyVetoException{ 
            return new JdbcTemplate(dataSource());
        }
    
        /** * 配置事务管理器 */
        @Bean
        public TransactionManager platformTransactionManager(DataSource dataSource) throws PropertyVetoException { 
            return new DataSourceTransactionManager(dataSource);
        }
    }

## 1.4 Service ##

public interface StudentService { 
    
    
        void insertStudent();
    
    }
    
    @Service
    public class StudentServiceImpl implements StudentService { 
    
        @Autowired
        private JdbcTemplate jdbcTemplate;
    
        @Transactional
        @Override
        public void insertStudent() { 
            String sql = "insert into `t_student` (c_name, c_age) values(?,?)";
            jdbcTemplate.update(sql, "张三", 18);
        }
    
    
    }

## 1.5 Test ##

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

# 1.6 运行 #

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# 2 @EnableTransactionManagement 解析 #

**作用：** 开启事务。  
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## 2.1TransactionManagementConfigurationSelector ##

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## 2.2 AutoProxyRegistrar ##

**描述：** 该类作向ioc中加入事务执行入口类InfrastructureAdvisorAutoProxyCreator.class，当bean实例化时进行后置加强。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 6]  
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## 2.3 ProxyTransactionManagementConfiguration ##

**描述：** 事务核心类，事务其实属于aop的一种典型实现，所以事务加强也有相应的pointcut和advice。

@Configuration(proxyBeanMethods = false)
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public class ProxyTransactionManagementConfiguration extends AbstractTransactionManagementConfiguration { 
    
    	@Bean(name = TransactionManagementConfigUtils.TRANSACTION_ADVISOR_BEAN_NAME)
    	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    	public BeanFactoryTransactionAttributeSourceAdvisor transactionAdvisor(
    			TransactionAttributeSource transactionAttributeSource, TransactionInterceptor transactionInterceptor) { 
    		/** * 创建事务切面，advisor(pointcut advice) */
    		BeanFactoryTransactionAttributeSourceAdvisor advisor = new BeanFactoryTransactionAttributeSourceAdvisor();
    		//设置属性
    		advisor.setTransactionAttributeSource(transactionAttributeSource);
    		//设置advice
    		advisor.setAdvice(transactionInterceptor);
    		if (this.enableTx != null) { 
    			advisor.setOrder(this.enableTx.<Integer>getNumber("order"));
    		}
    		return advisor;
    	}
    
    	/** * 事务属性 */
    	@Bean
    	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    	public TransactionAttributeSource transactionAttributeSource() { 
    		return new AnnotationTransactionAttributeSource();
    	}
    
    
    	/** * advice */
    	@Bean
    	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    	public TransactionInterceptor transactionInterceptor(TransactionAttributeSource transactionAttributeSource) { 
    		//创建事务切面
    		TransactionInterceptor interceptor = new TransactionInterceptor();
    		//设置事务处理器
    		interceptor.setTransactionAttributeSource(transactionAttributeSource);
    		//设置事务管理器
    		if (this.txManager != null) { 
    			interceptor.setTransactionManager(this.txManager);
    		}
    		return interceptor;
    	}
    
    }

### 切点： ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 8]  
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**描述：** 是切点就有类匹配和方法匹配，TransactionAttributeSourcePointcut事务切点主要核心是方法匹配，类匹配没怎么干事。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 10]  
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**描述：** 匹配核心源码如下，首先必须是public , 匹配方法上是否带有Transactional注解，最后匹配类上是否带有Transactional注解。

@Nullable
    	protected TransactionAttribute computeTransactionAttribute(Method method, @Nullable Class<?> targetClass) { 
    		// Don't allow no-public methods as required.
    
    		/** * 【1】 不是public方法不生成代理 */
    		if (allowPublicMethodsOnly() && !Modifier.isPublic(method.getModifiers())) { 
    			return null;
    		}
    
    		// The method may be on an interface, but we need attributes from the target class.
    		// If the target class is null, the method will be unchanged.
    		/** * 【2】 获取原始方法 */
    		Method specificMethod = AopUtils.getMostSpecificMethod(method, targetClass);
    
    		// First try is the method in the target class.
    		/** * 【3】 方法匹配，找@Transactional注解，并且把注解属性封装成TransactionAttribute对象 */
    		TransactionAttribute txAttr = findTransactionAttribute(specificMethod);
    		if (txAttr != null) { 
    			return txAttr;
    		}
    
    		// Second try is the transaction attribute on the target class.
    		/** * 【4】 如果方法上没有注解，则判断类上是否有注解 */
    		txAttr = findTransactionAttribute(specificMethod.getDeclaringClass());
    		if (txAttr != null && ClassUtils.isUserLevelMethod(method)) { 
    			return txAttr;
    		}
    
    		if (specificMethod != method) { 
    			// Fallback is to look at the original method.
    			txAttr = findTransactionAttribute(method);
    			if (txAttr != null) { 
    				return txAttr;
    			}
    			// Last fallback is the class of the original method.
    			txAttr = findTransactionAttribute(method.getDeclaringClass());
    			if (txAttr != null && ClassUtils.isUserLevelMethod(method)) { 
    				return txAttr;
    			}
    		}
    
    		return null;
    	}

### advice ###

**advice：** 事务加强方法  
![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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@Nullable
    	protected Object invokeWithinTransaction(Method method, @Nullable Class<?> targetClass,
    			final InvocationCallback invocation) throws Throwable { 
    
    		// If the transaction attribute is null, the method is non-transactional.
    
    		//获取事务属性
    		TransactionAttributeSource tas = getTransactionAttributeSource();
    
    		/** * 【1】 获取方法相关的事务属性（方法匹配pointcut过程） */
    		final TransactionAttribute txAttr = (tas != null ? tas.getTransactionAttribute(method, targetClass) : null);
    
    		/** * 【2】 获取事务管理器 */
    		final TransactionManager tm = determineTransactionManager(txAttr);
    
    		if (this.reactiveAdapterRegistry != null && tm instanceof ReactiveTransactionManager) { 
    			ReactiveTransactionSupport txSupport = this.transactionSupportCache.computeIfAbsent(method, key -> { 
    				if (KotlinDetector.isKotlinType(method.getDeclaringClass()) && KotlinDelegate.isSuspend(method)) { 
    					throw new TransactionUsageException(
    							"Unsupported annotated transaction on suspending function detected: " + method +
    							". Use TransactionalOperator.transactional extensions instead.");
    				}
    				ReactiveAdapter adapter = this.reactiveAdapterRegistry.getAdapter(method.getReturnType());
    				if (adapter == null) { 
    					throw new IllegalStateException("Cannot apply reactive transaction to non-reactive return type: " +
    							method.getReturnType());
    				}
    				return new ReactiveTransactionSupport(adapter);
    			});
    			return txSupport.invokeWithinTransaction(
    					method, targetClass, invocation, txAttr, (ReactiveTransactionManager) tm);
    		}
    
    		PlatformTransactionManager ptm = asPlatformTransactionManager(tm);
    		//获取jointPoint
    		final String joinpointIdentification = methodIdentification(method, targetClass, txAttr);
    
    		if (txAttr == null || !(ptm instanceof CallbackPreferringPlatformTransactionManager)) { 
    			// Standard transaction demarcation with getTransaction and commit/rollback calls.
    
    			/** * 【3】 开启事务 */
    			TransactionInfo txInfo = createTransactionIfNecessary(ptm, txAttr, joinpointIdentification);
    
    			Object retVal;
    			try { 
    				// This is an around advice: Invoke the next interceptor in the chain.
    				// This will normally result in a target object being invoked.
    				/** * 【4】 方法调取 */
    				retVal = invocation.proceedWithInvocation();
    			}
    			catch (Throwable ex) { 
    				// target invocation exception
    				/** * 【5】 回滚 */
    				completeTransactionAfterThrowing(txInfo, ex);
    				throw ex;
    			}
    			finally { 
    				cleanupTransactionInfo(txInfo);
    			}
    
    			if (retVal != null && vavrPresent && VavrDelegate.isVavrTry(retVal)) { 
    				// Set rollback-only in case of Vavr failure matching our rollback rules...
    				TransactionStatus status = txInfo.getTransactionStatus();
    				if (status != null && txAttr != null) { 
    					retVal = VavrDelegate.evaluateTryFailure(retVal, txAttr, status);
    				}
    			}
    
    			/** * 【7】 提交 */
    			commitTransactionAfterReturning(txInfo);
    			return retVal;
    		}

# 3 Debug #

## 3.1 修改代码 ##

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## 3.2 代理对象的创建 ##

**描述：** 流程和aop一样，在studentServiceImpl实例后置加强时，用所有的advisor匹配当前类、方法，获取当前类有效的advisors，如果advisors不为空，那么创建代理对象，如果当前对象是接口实现类那么使用jdk，否则使用cglib，并把proxyFactory、当前匹配advisors存入代理对象中。  
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## 3.3 事务执行 ##

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**结果：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 26]

[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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