聊聊spring tx的EnableTransactionManagement

本文主要研究一下spring tx的EnableTransactionManagement

EnableTransactionManagement

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/annotation/EnableTransactionManagement.java

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(TransactionManagementConfigurationSelector.class)
public @interface EnableTransactionManagement {

    /**
     * Indicate whether subclass-based (CGLIB) proxies are to be created ({@code true}) as
     * opposed to standard Java interface-based proxies ({@code false}). The default is
     * {@code false}. <strong>Applicable only if {@link #mode()} is set to
     * {@link AdviceMode#PROXY}</strong>.
     * <p>Note that setting this attribute to {@code true} will affect <em>all</em>
     * Spring-managed beans requiring proxying, not just those marked with
     * {@code @Transactional}. For example, other beans marked with Spring's
     * {@code @Async} annotation will be upgraded to subclass proxying at the same
     * time. This approach has no negative impact in practice unless one is explicitly
     * expecting one type of proxy vs another, e.g. in tests.
     */
    boolean proxyTargetClass() default false;

    /**
     * Indicate how transactional advice should be applied.
     * <p><b>The default is {@link AdviceMode#PROXY}.</b>
     * Please note that proxy mode allows for interception of calls through the proxy
     * only. Local calls within the same class cannot get intercepted that way; an
     * {@link Transactional} annotation on such a method within a local call will be
     * ignored since Spring's interceptor does not even kick in for such a runtime
     * scenario. For a more advanced mode of interception, consider switching this to
     * {@link AdviceMode#ASPECTJ}.
     */
    AdviceMode mode() default AdviceMode.PROXY;

    /**
     * Indicate the ordering of the execution of the transaction advisor
     * when multiple advices are applied at a specific joinpoint.
     * <p>The default is {@link Ordered#LOWEST_PRECEDENCE}.
     */
    int order() default Ordered.LOWEST_PRECEDENCE;

}
CGLIB

TransactionManagementConfigurationSelector

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/annotation/TransactionManagementConfigurationSelector.java

public class TransactionManagementConfigurationSelector extends AdviceModeImportSelector<EnableTransactionManagement> {

    /**
     * Returns {@link ProxyTransactionManagementConfiguration} or
     * {@code AspectJ(Jta)TransactionManagementConfiguration} for {@code PROXY}
     * and {@code ASPECTJ} values of {@link EnableTransactionManagement#mode()},
     * respectively.
     */
    @Override
    protected String[] selectImports(AdviceMode adviceMode) {
        switch (adviceMode) {
            case PROXY:
                return new String[] {AutoProxyRegistrar.class.getName(),
                        ProxyTransactionManagementConfiguration.class.getName()};
            case ASPECTJ:
                return new String[] {determineTransactionAspectClass()};
            default:
                return null;
        }
    }

    private String determineTransactionAspectClass() {
        return (ClassUtils.isPresent("javax.transaction.Transactional", getClass().getClassLoader()) ?
                TransactionManagementConfigUtils.JTA_TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME :
                TransactionManagementConfigUtils.TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME);
    }

}
  • TransactionManagementConfigurationSelector继承了抽象类AdviceModeImportSelector,它覆盖了selectImports,该方法根据adviceMode返回要创建的类名;如果是PROXY模式,则返回AutoProxyRegistrar.class.getName(),ProxyTransactionManagementConfiguration.class.getName();如果是ASPECTJ模式,则返回TransactionManagementConfigUtils.JTA_TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME或者是TransactionManagementConfigUtils.TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME

AbstractTransactionManagementConfiguration

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/annotation/AbstractTransactionManagementConfiguration.java

@Configuration
public abstract class AbstractTransactionManagementConfiguration implements ImportAware {

    @Nullable
    protected AnnotationAttributes enableTx;

    /**
     * Default transaction manager, as configured through a {@link TransactionManagementConfigurer}.
     */
    @Nullable
    protected PlatformTransactionManager txManager;


    @Override
    public void setImportMetadata(AnnotationMetadata importMetadata) {
        this.enableTx = AnnotationAttributes.fromMap(
                importMetadata.getAnnotationAttributes(EnableTransactionManagement.class.getName(), false));
        if (this.enableTx == null) {
            throw new IllegalArgumentException(
                    "@EnableTransactionManagement is not present on importing class " + importMetadata.getClassName());
        }
    }

    @Autowired(required = false)
    void setConfigurers(Collection<TransactionManagementConfigurer> configurers) {
        if (CollectionUtils.isEmpty(configurers)) {
            return;
        }
        if (configurers.size() > 1) {
            throw new IllegalStateException("Only one TransactionManagementConfigurer may exist");
        }
        TransactionManagementConfigurer configurer = configurers.iterator().next();
        this.txManager = configurer.annotationDrivenTransactionManager();
    }


    @Bean(name = TransactionManagementConfigUtils.TRANSACTIONAL_EVENT_LISTENER_FACTORY_BEAN_NAME)
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public static TransactionalEventListenerFactory transactionalEventListenerFactory() {
        return new TransactionalEventListenerFactory();
    }

}
  • AbstractTransactionManagementConfiguration为EnableTransactionManagement注解提供了通用的结构,这里主要是初始化了txManager,以及创建了TransactionalEventListenerFactory;它有三个子类,分别是ProxyTransactionManagementConfiguration、AspectJTransactionManagementConfiguration、AspectJJtaTransactionManagementConfiguration

ProxyTransactionManagementConfiguration

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/annotation/ProxyTransactionManagementConfiguration.java

@Configuration
public class ProxyTransactionManagementConfiguration extends AbstractTransactionManagementConfiguration {

    @Bean(name = TransactionManagementConfigUtils.TRANSACTION_ADVISOR_BEAN_NAME)
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public BeanFactoryTransactionAttributeSourceAdvisor transactionAdvisor() {
        BeanFactoryTransactionAttributeSourceAdvisor advisor = new BeanFactoryTransactionAttributeSourceAdvisor();
        advisor.setTransactionAttributeSource(transactionAttributeSource());
        advisor.setAdvice(transactionInterceptor());
        if (this.enableTx != null) {
            advisor.setOrder(this.enableTx.<Integer>getNumber("order"));
        }
        return advisor;
    }

    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public TransactionAttributeSource transactionAttributeSource() {
        return new AnnotationTransactionAttributeSource();
    }

    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public TransactionInterceptor transactionInterceptor() {
        TransactionInterceptor interceptor = new TransactionInterceptor();
        interceptor.setTransactionAttributeSource(transactionAttributeSource());
        if (this.txManager != null) {
            interceptor.setTransactionManager(this.txManager);
        }
        return interceptor;
    }

}
  • ProxyTransactionManagementConfiguration继承了AbstractTransactionManagementConfiguration,这里它注册了BeanFactoryTransactionAttributeSourceAdvisor、TransactionAttributeSource( AnnotationTransactionAttributeSource
    )、TransactionInterceptor

AnnotationTransactionAttributeSource

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/annotation/AnnotationTransactionAttributeSource.java

public class AnnotationTransactionAttributeSource extends AbstractFallbackTransactionAttributeSource
        implements Serializable {

    private static final boolean jta12Present;

    private static final boolean ejb3Present;

    static {
        ClassLoader classLoader = AnnotationTransactionAttributeSource.class.getClassLoader();
        jta12Present = ClassUtils.isPresent("javax.transaction.Transactional", classLoader);
        ejb3Present = ClassUtils.isPresent("javax.ejb.TransactionAttribute", classLoader);
    }

    private final boolean publicMethodsOnly;

    private final Set<TransactionAnnotationParser> annotationParsers;


    /**
     * Create a default AnnotationTransactionAttributeSource, supporting
     * public methods that carry the {@code Transactional} annotation
     * or the EJB3 {@link javax.ejb.TransactionAttribute} annotation.
     */
    public AnnotationTransactionAttributeSource() {
        this(true);
    }

    /**
     * Create a custom AnnotationTransactionAttributeSource, supporting
     * public methods that carry the {@code Transactional} annotation
     * or the EJB3 {@link javax.ejb.TransactionAttribute} annotation.
     * @param publicMethodsOnly whether to support public methods that carry
     * the {@code Transactional} annotation only (typically for use
     * with proxy-based AOP), or protected/private methods as well
     * (typically used with AspectJ class weaving)
     */
    public AnnotationTransactionAttributeSource(boolean publicMethodsOnly) {
        this.publicMethodsOnly = publicMethodsOnly;
        if (jta12Present || ejb3Present) {
            this.annotationParsers = new LinkedHashSet<>(4);
            this.annotationParsers.add(new SpringTransactionAnnotationParser());
            if (jta12Present) {
                this.annotationParsers.add(new JtaTransactionAnnotationParser());
            }
            if (ejb3Present) {
                this.annotationParsers.add(new Ejb3TransactionAnnotationParser());
            }
        }
        else {
            this.annotationParsers = Collections.singleton(new SpringTransactionAnnotationParser());
        }
    }

    //......

}
  • AnnotationTransactionAttributeSource的无参构造器,设置了publicMethodsOnly为true,同时创建了SpringTransactionAnnotationParser

TransactionInterceptor

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionInterceptor.java

public class TransactionInterceptor extends TransactionAspectSupport implements MethodInterceptor, Serializable {

    /**
     * Create a new TransactionInterceptor.
     * <p>Transaction manager and transaction attributes still need to be set.
     * @see #setTransactionManager
     * @see #setTransactionAttributes(java.util.Properties)
     * @see #setTransactionAttributeSource(TransactionAttributeSource)
     */
    public TransactionInterceptor() {
    }

    /**
     * Create a new TransactionInterceptor.
     * @param ptm the default transaction manager to perform the actual transaction management
     * @param attributes the transaction attributes in properties format
     * @see #setTransactionManager
     * @see #setTransactionAttributes(java.util.Properties)
     */
    public TransactionInterceptor(PlatformTransactionManager ptm, Properties attributes) {
        setTransactionManager(ptm);
        setTransactionAttributes(attributes);
    }

    /**
     * Create a new TransactionInterceptor.
     * @param ptm the default transaction manager to perform the actual transaction management
     * @param tas the attribute source to be used to find transaction attributes
     * @see #setTransactionManager
     * @see #setTransactionAttributeSource(TransactionAttributeSource)
     */
    public TransactionInterceptor(PlatformTransactionManager ptm, TransactionAttributeSource tas) {
        setTransactionManager(ptm);
        setTransactionAttributeSource(tas);
    }


    @Override
    @Nullable
    public Object invoke(MethodInvocation invocation) throws Throwable {
        // Work out the target class: may be {@code null}.
        // The TransactionAttributeSource should be passed the target class
        // as well as the method, which may be from an interface.
        Class<?> targetClass = (invocation.getThis() != null ? AopUtils.getTargetClass(invocation.getThis()) : null);

        // Adapt to TransactionAspectSupport's invokeWithinTransaction...
        return invokeWithinTransaction(invocation.getMethod(), targetClass, invocation::proceed);
    }


    //---------------------------------------------------------------------
    // Serialization support
    //---------------------------------------------------------------------

    private void writeObject(ObjectOutputStream oos) throws IOException {
        // Rely on default serialization, although this class itself doesn't carry state anyway...
        oos.defaultWriteObject();

        // Deserialize superclass fields.
        oos.writeObject(getTransactionManagerBeanName());
        oos.writeObject(getTransactionManager());
        oos.writeObject(getTransactionAttributeSource());
        oos.writeObject(getBeanFactory());
    }

    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        // Rely on default serialization, although this class itself doesn't carry state anyway...
        ois.defaultReadObject();

        // Serialize all relevant superclass fields.
        // Superclass can't implement Serializable because it also serves as base class
        // for AspectJ aspects (which are not allowed to implement Serializable)!
        setTransactionManagerBeanName((String) ois.readObject());
        setTransactionManager((PlatformTransactionManager) ois.readObject());
        setTransactionAttributeSource((TransactionAttributeSource) ois.readObject());
        setBeanFactory((BeanFactory) ois.readObject());
    }

}
  • TransactionInterceptor继承了抽象类TransactionAspectSupport,同时实现了MethodInterceptor, Serializable接口;其invoke方法首先读取targetClass,然后调用了抽象类TransactionAspectSupport的invokeWithinTransaction方法

TransactionAspectSupport

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionAspectSupport.java

public abstract class TransactionAspectSupport implements BeanFactoryAware, InitializingBean {

    // NOTE: This class must not implement Serializable because it serves as base
    // class for AspectJ aspects (which are not allowed to implement Serializable)!

    private static final Object DEFAULT_TRANSACTION_MANAGER_KEY = new Object();

    private static final ThreadLocal<TransactionInfo> transactionInfoHolder =
            new NamedThreadLocal<>("Current aspect-driven transaction");

    @Nullable
    protected static TransactionInfo currentTransactionInfo() throws NoTransactionException {
        return transactionInfoHolder.get();
    }

    public static TransactionStatus currentTransactionStatus() throws NoTransactionException {
        TransactionInfo info = currentTransactionInfo();
        if (info == null || info.transactionStatus == null) {
            throw new NoTransactionException("No transaction aspect-managed TransactionStatus in scope");
        }
        return info.transactionStatus;
    }


    protected final Log logger = LogFactory.getLog(getClass());

    @Nullable
    private String transactionManagerBeanName;

    @Nullable
    private PlatformTransactionManager transactionManager;

    @Nullable
    private TransactionAttributeSource transactionAttributeSource;

    @Nullable
    private BeanFactory beanFactory;

    private final ConcurrentMap<Object, PlatformTransactionManager> transactionManagerCache =
            new ConcurrentReferenceHashMap<>(4);

    //......        
    /**
     * General delegate for around-advice-based subclasses, delegating to several other template
     * methods on this class. Able to handle {@link CallbackPreferringPlatformTransactionManager}
     * as well as regular {@link PlatformTransactionManager} implementations.
     * @param method the Method being invoked
     * @param targetClass the target class that we're invoking the method on
     * @param invocation the callback to use for proceeding with the target invocation
     * @return the return value of the method, if any
     * @throws Throwable propagated from the target invocation
     */
    @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.
        TransactionAttributeSource tas = getTransactionAttributeSource();
        final TransactionAttribute txAttr = (tas != null ? tas.getTransactionAttribute(method, targetClass) : null);
        final PlatformTransactionManager tm = determineTransactionManager(txAttr);
        final String joinpointIdentification = methodIdentification(method, targetClass, txAttr);

        if (txAttr == null || !(tm instanceof CallbackPreferringPlatformTransactionManager)) {
            // Standard transaction demarcation with getTransaction and commit/rollback calls.
            TransactionInfo txInfo = createTransactionIfNecessary(tm, txAttr, joinpointIdentification);
            Object retVal = null;
            try {
                // This is an around advice: Invoke the next interceptor in the chain.
                // This will normally result in a target object being invoked.
                retVal = invocation.proceedWithInvocation();
            }
            catch (Throwable ex) {
                // target invocation exception
                completeTransactionAfterThrowing(txInfo, ex);
                throw ex;
            }
            finally {
                cleanupTransactionInfo(txInfo);
            }
            commitTransactionAfterReturning(txInfo);
            return retVal;
        }

        else {
            final ThrowableHolder throwableHolder = new ThrowableHolder();

            // It's a CallbackPreferringPlatformTransactionManager: pass a TransactionCallback in.
            try {
                Object result = ((CallbackPreferringPlatformTransactionManager) tm).execute(txAttr, status -> {
                    TransactionInfo txInfo = prepareTransactionInfo(tm, txAttr, joinpointIdentification, status);
                    try {
                        return invocation.proceedWithInvocation();
                    }
                    catch (Throwable ex) {
                        if (txAttr.rollbackOn(ex)) {
                            // A RuntimeException: will lead to a rollback.
                            if (ex instanceof RuntimeException) {
                                throw (RuntimeException) ex;
                            }
                            else {
                                throw new ThrowableHolderException(ex);
                            }
                        }
                        else {
                            // A normal return value: will lead to a commit.
                            throwableHolder.throwable = ex;
                            return null;
                        }
                    }
                    finally {
                        cleanupTransactionInfo(txInfo);
                    }
                });

                // Check result state: It might indicate a Throwable to rethrow.
                if (throwableHolder.throwable != null) {
                    throw throwableHolder.throwable;
                }
                return result;
            }
            catch (ThrowableHolderException ex) {
                throw ex.getCause();
            }
            catch (TransactionSystemException ex2) {
                if (throwableHolder.throwable != null) {
                    logger.error("Application exception overridden by commit exception", throwableHolder.throwable);
                    ex2.initApplicationException(throwableHolder.throwable);
                }
                throw ex2;
            }
            catch (Throwable ex2) {
                if (throwableHolder.throwable != null) {
                    logger.error("Application exception overridden by commit exception", throwableHolder.throwable);
                }
                throw ex2;
            }
        }
    }

    //......
}
  • TransactionAspectSupport的invokeWithinTransaction方法对于TransactionAttribute不为null且PlatformTransactionManager是CallbackPreferringPlatformTransactionManager类型的在TransactionCallback中事务处理;其他的则使用标准的getTransaction and commit/rollback calls模式来进行事务处理,执行前调用createTransactionIfNecessary,异常时调用completeTransactionAfterThrowing,finally时调用cleanupTransactionInfo,最后调用commitTransactionAfterReturning

createTransactionIfNecessary

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionAspectSupport.java

/**
     * Create a transaction if necessary based on the given TransactionAttribute.
     * <p>Allows callers to perform custom TransactionAttribute lookups through
     * the TransactionAttributeSource.
     * @param txAttr the TransactionAttribute (may be {@code null})
     * @param joinpointIdentification the fully qualified method name
     * (used for monitoring and logging purposes)
     * @return a TransactionInfo object, whether or not a transaction was created.
     * The {@code hasTransaction()} method on TransactionInfo can be used to
     * tell if there was a transaction created.
     * @see #getTransactionAttributeSource()
     */
    @SuppressWarnings("serial")
    protected TransactionInfo createTransactionIfNecessary(@Nullable PlatformTransactionManager tm,
            @Nullable TransactionAttribute txAttr, final String joinpointIdentification) {

        // If no name specified, apply method identification as transaction name.
        if (txAttr != null && txAttr.getName() == null) {
            txAttr = new DelegatingTransactionAttribute(txAttr) {
                @Override
                public String getName() {
                    return joinpointIdentification;
                }
            };
        }

        TransactionStatus status = null;
        if (txAttr != null) {
            if (tm != null) {
                status = tm.getTransaction(txAttr);
            }
            else {
                if (logger.isDebugEnabled()) {
                    logger.debug("Skipping transactional joinpoint [" + joinpointIdentification +
                            "] because no transaction manager has been configured");
                }
            }
        }
        return prepareTransactionInfo(tm, txAttr, joinpointIdentification, status);
    }

    /**
     * Prepare a TransactionInfo for the given attribute and status object.
     * @param txAttr the TransactionAttribute (may be {@code null})
     * @param joinpointIdentification the fully qualified method name
     * (used for monitoring and logging purposes)
     * @param status the TransactionStatus for the current transaction
     * @return the prepared TransactionInfo object
     */
    protected TransactionInfo prepareTransactionInfo(@Nullable PlatformTransactionManager tm,
            @Nullable TransactionAttribute txAttr, String joinpointIdentification,
            @Nullable TransactionStatus status) {

        TransactionInfo txInfo = new TransactionInfo(tm, txAttr, joinpointIdentification);
        if (txAttr != null) {
            // We need a transaction for this method...
            if (logger.isTraceEnabled()) {
                logger.trace("Getting transaction for [" + txInfo.getJoinpointIdentification() + "]");
            }
            // The transaction manager will flag an error if an incompatible tx already exists.
            txInfo.newTransactionStatus(status);
        }
        else {
            // The TransactionInfo.hasTransaction() method will return false. We created it only
            // to preserve the integrity of the ThreadLocal stack maintained in this class.
            if (logger.isTraceEnabled()) {
                logger.trace("Don't need to create transaction for [" + joinpointIdentification +
                        "]: This method isn't transactional.");
            }
        }

        // We always bind the TransactionInfo to the thread, even if we didn't create
        // a new transaction here. This guarantees that the TransactionInfo stack
        // will be managed correctly even if no transaction was created by this aspect.
        txInfo.bindToThread();
        return txInfo;
    }
  • createTransactionIfNecessary方法基于TransactionAttribute判断是否需要新创建transaction,然后执行prepareTransactionInfo创建TransactionInfo并bindToThread

completeTransactionAfterThrowing

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionAspectSupport.java

/**
     * Handle a throwable, completing the transaction.
     * We may commit or roll back, depending on the configuration.
     * @param txInfo information about the current transaction
     * @param ex throwable encountered
     */
    protected void completeTransactionAfterThrowing(@Nullable TransactionInfo txInfo, Throwable ex) {
        if (txInfo != null && txInfo.getTransactionStatus() != null) {
            if (logger.isTraceEnabled()) {
                logger.trace("Completing transaction for [" + txInfo.getJoinpointIdentification() +
                        "] after exception: " + ex);
            }
            if (txInfo.transactionAttribute != null && txInfo.transactionAttribute.rollbackOn(ex)) {
                try {
                    txInfo.getTransactionManager().rollback(txInfo.getTransactionStatus());
                }
                catch (TransactionSystemException ex2) {
                    logger.error("Application exception overridden by rollback exception", ex);
                    ex2.initApplicationException(ex);
                    throw ex2;
                }
                catch (RuntimeException | Error ex2) {
                    logger.error("Application exception overridden by rollback exception", ex);
                    throw ex2;
                }
            }
            else {
                // We don't roll back on this exception.
                // Will still roll back if TransactionStatus.isRollbackOnly() is true.
                try {
                    txInfo.getTransactionManager().commit(txInfo.getTransactionStatus());
                }
                catch (TransactionSystemException ex2) {
                    logger.error("Application exception overridden by commit exception", ex);
                    ex2.initApplicationException(ex);
                    throw ex2;
                }
                catch (RuntimeException | Error ex2) {
                    logger.error("Application exception overridden by commit exception", ex);
                    throw ex2;
                }
            }
        }
    }
  • completeTransactionAfterThrowing用于处理异常情况,它根据TransactionInfo及Throwable信息判断是要rollback还是commit

cleanupTransactionInfo

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionAspectSupport.java

/**
     * Reset the TransactionInfo ThreadLocal.
     * <p>Call this in all cases: exception or normal return!
     * @param txInfo information about the current transaction (may be {@code null})
     */
    protected void cleanupTransactionInfo(@Nullable TransactionInfo txInfo) {
        if (txInfo != null) {
            txInfo.restoreThreadLocalStatus();
        }
    }
  • cleanupTransactionInfo用于重置ThreadLocal的TransactionInfo

commitTransactionAfterReturning

spring-tx-5.1.6.RELEASE-sources.jar!/org/springframework/transaction/interceptor/TransactionAspectSupport.java

/**
     * Execute after successful completion of call, but not after an exception was handled.
     * Do nothing if we didn't create a transaction.
     * @param txInfo information about the current transaction
     */
    protected void commitTransactionAfterReturning(@Nullable TransactionInfo txInfo) {
        if (txInfo != null && txInfo.getTransactionStatus() != null) {
            if (logger.isTraceEnabled()) {
                logger.trace("Completing transaction for [" + txInfo.getJoinpointIdentification() + "]");
            }
            txInfo.getTransactionManager().commit(txInfo.getTransactionStatus());
        }
    }
  • commitTransactionAfterReturning用于在方法执行成功时来commit事务

小结

CGLIB
AnnotationTransactionAttributeSource

doc

  • 5.7. Transactionality
  • Transactions with Spring and JPA
  • Using Transactions in Spring Data JPA

原文 

https://segmentfault.com/a/1190000018880677

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