Seata源码—7.Seata TCC模式的事务处理一

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原创最新推荐文章于 2026-04-12 09:21:01 发布 686 阅读 AI 写同款· GEO 优化 ›

分布式事务（六）Seata TCC模式-TCC模式介绍文章目录TCC 基本原理第一阶段 Try第二阶段 Confirm第二阶段 Cancel多个事务并发的情况Seata TCC事务模式项目源码： https://gitee.com/benwang6/seata-samples TCC 基本原理 TCC 与 Seata AT 事务一样都是两阶段事务，它与 AT 事务的主要区别为： TCC 对业务代码侵入严重每个阶段的数据操作都要自己进行编码来实现，事务框架无法自动处理。 TCC 效率更高不必对数据加全局锁，允许多个事务同时操作数据。第一阶阅读详情

大纲

1.Seata TCC分布式事务案例配置

2.Seata TCC案例服务提供者启动分析

3.@TwoPhaseBusinessAction注解扫描源码

4.Seata TCC案例分布式事务入口分析

5.TCC核心注解扫描与代理创建入口源码

6.TCC动态代理拦截器TccActionInterceptor

7.Action拦截处理器ActionInterceptorHandler

8.Seata TCC分布式事务的注册提交回滚处理源码

1.Seata TCC分布式事务案例配置

(1)位于seata-samples的tcc模块下的Demo工程

(2)Demo工程的配置文件

(3)Demo工程运行说明

(1)位于seata-samples的tcc模块下的Demo工程

dubbo-tcc-sample模块主要演示了TCC模式下分布式事务的提交和回滚。该Demo中一个分布式事务内会有两个TCC事务参与者，这两个TCC事务参与者分别是TccActionOne和TccActionTwo。分布式事务提交则两者均提交，分布式事务回滚则两者均回滚。

这两个TCC事务参与者均是Dubbo远程服务。一个应用作为服务提供方，会实现这两个TCC参与者，并将它们发布成Dubbo服务。另外一个应用作为事务发起方，会订阅Dubbo服务，然后调用编排TCC参与者，执行远程Dubbo服务。

TccActionOne接口定义如下：

public interface TccActionOne {
    @TwoPhaseBusinessAction(name = "DubboTccActionOne", commitMethod = "commit", rollbackMethod = "rollback")
    public boolean prepare(BusinessActionContext actionContext, 
        @BusinessActionContextParameter(paramName = "a") int a);
    public boolean commit(BusinessActionContext actionContext);
    public boolean rollback(BusinessActionContext actionContext);
}

TccActionTwo接口定义如下：

public interface TccActionTwo {
    @TwoPhaseBusinessAction(name = "DubboTccActionTwo", commitMethod = "commit", rollbackMethod = "rollback")
    public boolean prepare(BusinessActionContext actionContext,
        @BusinessActionContextParameter(paramName = "b") String b,
        @BusinessActionContextParameter(paramName = "c", index = 1) List list);
    public boolean commit(BusinessActionContext actionContext);
    public boolean rollback(BusinessActionContext actionContext);
}

(2)Demo工程的配置文件

一.seata-tcc.xml

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
       default-autowire="byName">

    <!-- fescar bean scanner -->
    <bean class="io.seata.spring.annotation.GlobalTransactionScanner">
        <constructor-arg value="tcc-sample"/>
        <constructor-arg value="my_test_tx_group"/>
    </bean>

    <bean id="tccActionOneImpl" class="io.seata.samples.tcc.dubbo.action.impl.TccActionOneImpl"/>
    <bean id="tccActionTwoImpl" class="io.seata.samples.tcc.dubbo.action.impl.TccActionTwoImpl"/>
    <bean id="tccTransactionService" class="io.seata.samples.tcc.dubbo.service.TccTransactionService"/>
</beans>

二.seata-dubbo-provider.xml

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo
       http://code.alibabatech.com/schema/dubbo/dubbo.xsd" default-autowire="byName">
    <dubbo:application name="tcc-sample">
        <dubbo:parameter key="qos.enable" value="false"/>
    </dubbo:application>

    <!--使用 zookeeper 注册中心暴露服务，注意要先开启 zookeeper-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:protocol name="dubbo" port="-1"/>
    <dubbo:provider timeout="10000" threads="10" threadpool="fixed" loadbalance="roundrobin"/>

    <!-- 第一个TCC 参与者服务发布 -->
    <dubbo:service interface="io.seata.samples.tcc.dubbo.action.TccActionOne" ref="tccActionOneImpl"/>
    <!-- 第二个TCC 参与者服务发布 -->
    <dubbo:service interface="io.seata.samples.tcc.dubbo.action.TccActionTwo" ref="tccActionTwoImpl"/>
</beans>

三.seata-dubbo-reference.xml

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo
       http://code.alibabatech.com/schema/dubbo/dubbo.xsd" default-autowire="byName">
    <dubbo:application name="tcc-sample-reference">
        <dubbo:parameter key="qos.enable" value="false"/>
    </dubbo:application>

    <!--使用 zookeeper 注册中心暴露服务，注意要先开启 zookeeper-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:protocol name="dubbo" port="-1"/>
    <dubbo:provider timeout="10000" threads="10" threadpool="fixed" loadbalance="roundrobin"/>

    <!-- 第一个TCC参与者 服务订阅 -->
    <dubbo:reference id="tccActionOne" interface="io.seata.samples.tcc.dubbo.action.TccActionOne" check="false" lazy="true"/>
    <!-- 第二个TCC参与者 服务订阅 -->
    <dubbo:reference id="tccActionTwo" interface="io.seata.samples.tcc.dubbo.action.TccActionTwo" check="false" lazy="true"/>
</beans>

(3)Demo工程运行指南

一.启动Seata Server

二.启动Dubbo服务应用

运行DubboTccProviderStarter。该应用会发布Dubbo服务，并且实现了两个TCC参与者。

public class TccProviderStarter extends AbstractStarter {
    public static void main(String[] args) throws Exception {
        new TccProviderStarter().start0(args);
    }
    
    @Override
    protected void start0(String[] args) throws Exception {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(
            new String[]{"spring/seata-tcc.xml", "spring/seata-dubbo-provider.xml"}
        );
        new ApplicationKeeper().keep();
    }
}

public class TccActionOneImpl implements TccActionOne {
    @Override
    public boolean prepare(BusinessActionContext actionContext, int a) {
        String xid = actionContext.getXid();
        System.out.println("TccActionOne prepare, xid:" + xid + ", a:" + a);
        return true;
    }
    
    @Override
    public boolean commit(BusinessActionContext actionContext) {
        String xid = actionContext.getXid();
        System.out.println("TccActionOne commit, xid:" + xid + ", a:" + actionContext.getActionContext("a"));
        ResultHolder.setActionOneResult(xid, "T");
        return true;
    }
    
    @Override
    public boolean rollback(BusinessActionContext actionContext) {
        String xid = actionContext.getXid();
        System.out.println("TccActionOne rollback, xid:" + xid + ", a:" + actionContext.getActionContext("a"));
        ResultHolder.setActionOneResult(xid, "R");
        return true;
    }
}

public class TccActionTwoImpl implements TccActionTwo {
    @Override
    public boolean prepare(BusinessActionContext actionContext, String b, List list) {
        String xid = actionContext.getXid();
        System.out.println("TccActionTwo prepare, xid:" + xid + ", b:" + b + ", c:" + list.get(1));
        return true;
    }
    
    @Override
    public boolean commit(BusinessActionContext actionContext) {
        String xid = actionContext.getXid();
        System.out.println("TccActionTwo commit, xid:" + xid + ", b:" + actionContext.getActionContext("b") + ", c:" + actionContext.getActionContext("c"));
        ResultHolder.setActionTwoResult(xid, "T");
        return true;
    }
    
    @Override
    public boolean rollback(BusinessActionContext actionContext) {
        String xid = actionContext.getXid();
        System.out.println("TccActionTwo rollback, xid:" + xid + ", b:" + actionContext.getActionContext("b") + ", c:" + actionContext.getActionContext("c"));
        ResultHolder.setActionTwoResult(xid, "R");
        return true;
    }
}

三.启动事务应用

运行TccConsumerStarter。该应用会订阅Dubbo服务，发起分布式事务，调用上述两个TCC参与者，内含TCC事务提交场景和TCC事务回滚场景的演示。

public class TccConsumerStarter extends AbstractStarter {
    static TccTransactionService tccTransactionService = null;
    
    public static void main(String[] args) throws Exception {
        new TccConsumerStarter().start0(args);
    }
    
    @Override
    protected void start0(String[] args) throws Exception {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(
            new String[]{"spring/seata-tcc.xml", "spring/seata-dubbo-reference.xml"}
        );
        tccTransactionService = (TccTransactionService) applicationContext.getBean("tccTransactionService");
        //分布式事务提交demo
        transactionCommitDemo();
        //分布式事务回滚demo
        transactionRollbackDemo();
    }
    
    private static void transactionCommitDemo() throws InterruptedException {
        String txId = tccTransactionService.doTransactionCommit();
        System.out.println(txId);
        Assert.isTrue(StringUtils.isNotEmpty(txId), "事务开启失败");
        System.out.println("transaction commit demo finish.");
    }
    
    private static void transactionRollbackDemo() throws InterruptedException {
        Map map = new HashMap(16);
        try {
            tccTransactionService.doTransactionRollback(map);
            Assert.isTrue(false, "分布式事务未回滚");
        } catch (Throwable t) {
            Assert.isTrue(true, "分布式事务异常回滚");
        }
        String txId = (String) map.get("xid");
        System.out.println(txId);
        System.out.println("transaction rollback demo finish.");
    }
}

public class TccTransactionService {
    private TccActionOne tccActionOne;
    private TccActionTwo tccActionTwo;

    //提交分布式事务
    @GlobalTransactional
    public String doTransactionCommit() {
        //第一个TCC事务参与者
        boolean result = tccActionOne.prepare(null, 1);
        if (!result) {
            throw new RuntimeException("TccActionOne failed.");
        }
        List list = new ArrayList();
        list.add("c1");
        list.add("c2");
        //第二个TCC事务参与者
        result = tccActionTwo.prepare(null, "two", list);
        if (!result) {
            throw new RuntimeException("TccActionTwo failed.");
        }
        return RootContext.getXID();
    }
    
    //回滚分布式事务
    @GlobalTransactional
    public String doTransactionRollback(Map map) {
        //第一个TCC事务参与者
        boolean result = tccActionOne.prepare(null, 1);
        if (!result) {
            throw new RuntimeException("TccActionOne failed.");
        }
        List list = new ArrayList();
        list.add("c1");
        list.add("c2");
        //第二个TCC事务参与者
        result = tccActionTwo.prepare(null, "two", list);
        if (!result) {
            throw new RuntimeException("TccActionTwo failed.");
        }
        map.put("xid", RootContext.getXID());
        throw new RuntimeException("transacton rollback");
    }

    public void setTccActionOne(TccActionOne tccActionOne) {
        this.tccActionOne = tccActionOne;
    }
    
    public void setTccActionTwo(TccActionTwo tccActionTwo) {
        this.tccActionTwo = tccActionTwo;
    }
}

2.Seata TCC案例服务提供者启动分析

添加了@TwoPhaseBusinessAction注解的接口发布成Dubbo服务：

3.@TwoPhaseBusinessAction注解扫描源码

(1)全局事务注解扫描器的wrapIfNecessary()方法扫描Spring Bean

(2)TCCBeanParserUtils的isTccAutoProxy()方法判断是否要创建TCC动态代理

(1)全局事务注解扫描器的wrapIfNecessary()方法扫描Spring Bean

全局事务注解扫描器GlobalTransactionScanner会在调用initClient()方法初始化Seata Client客户端后，通过wrapIfNecessary()方法扫描Spring Bean中含有@TwoPhaseBusinessAction注解的方法。

//AbstractAutoProxyCreator：Spring的动态代理自动创建者
//ConfigurationChangeListener：关注配置变更事件的监听器
//InitializingBean：Spring Bean初始化回调
//ApplicationContextAware：用来感知Spring容器
//DisposableBean：支持可抛弃Bean
public class GlobalTransactionScanner extends AbstractAutoProxyCreator
        implements ConfigurationChangeListener, InitializingBean, ApplicationContextAware, DisposableBean {
    ...
    
    //InitializingBean接口的回调方法
    //Spring容器启动和初始化完毕后，会调用如下的afterPropertiesSet()方法进行回调
    @Override
    public void afterPropertiesSet() {
        //是否禁用了全局事务，默认是false
        if (disableGlobalTransaction) {
            if (LOGGER.isInfoEnabled()) {
                LOGGER.info("Global transaction is disabled.");
            }
            ConfigurationCache.addConfigListener(ConfigurationKeys.DISABLE_GLOBAL_TRANSACTION, (ConfigurationChangeListener)this);
            return;
        }
        //通过CAS操作确保initClient()初始化动作仅仅执行一次
        if (initialized.compareAndSet(false, true)) {
            //initClient()方法会对Seata Client进行初始化，比如和Seata Server建立长连接
            //seata-samples的tcc模块的seata-tcc.xml配置文件里都配置了GlobalTransactionScanner这个Bean
            //而GlobalTransactionScanner这个Bean伴随着Spring容器的初始化完毕，都会回调其初始化逻辑initClient()
            initClient();
        }
    }

    //initClient()是核心方法，负责对Seata Client客户端进行初始化
    private void initClient() {
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("Initializing Global Transaction Clients ... ");
        }
        if (DEFAULT_TX_GROUP_OLD.equals(txServiceGroup)) {
            LOGGER.warn("...", DEFAULT_TX_GROUP_OLD, DEFAULT_TX_GROUP);
        }
        if (StringUtils.isNullOrEmpty(applicationId) || StringUtils.isNullOrEmpty(txServiceGroup)) {
            throw new IllegalArgumentException(String.format("applicationId: %s, txServiceGroup: %s", applicationId, txServiceGroup));
        }

        //对于Seata Client来说，最重要的组件有两个：
        //一个是TM，即Transaction Manager，用来管理全局事务
        //一个是RM，即Resource Manager，用来管理各分支事务的数据源

        //init TM
        //TMClient.init()会对客户端的TM全局事务管理器进行初始化
        TMClient.init(applicationId, txServiceGroup, accessKey, secretKey);
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("Transaction Manager Client is initialized. applicationId[{}] txServiceGroup[{}]", applicationId, txServiceGroup);
        }

        //init RM
        //RMClient.init()会对客户端的RM分支事务资源管理器进行初始化
        RMClient.init(applicationId, txServiceGroup);
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("Resource Manager is initialized. applicationId[{}] txServiceGroup[{}]", applicationId, txServiceGroup);
        }

        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("Global Transaction Clients are initialized. ");
        }

        //注册Spring容器被销毁时的回调钩子，释放TM和RM两个组件的一些资源
        registerSpringShutdownHook();
    }
    
    //The following will be scanned, and added corresponding interceptor:
    //添加了如下注解的方法会被扫描到，然后方法会添加相应的拦截器进行拦截
    
    //TM:
    //@see io.seata.spring.annotation.GlobalTransactional // TM annotation
    //Corresponding interceptor:
    //@see io.seata.spring.annotation.GlobalTransactionalInterceptor#handleGlobalTransaction(MethodInvocation, AspectTransactional) // TM handler
    
    //GlobalLock:
    //@see io.seata.spring.annotation.GlobalLock // GlobalLock annotation
    //Corresponding interceptor:
    //@see io.seata.spring.annotation.GlobalTransactionalInterceptor# handleGlobalLock(MethodInvocation, GlobalLock)  // GlobalLock handler
    
    //TCC mode:
    //@see io.seata.rm.tcc.api.LocalTCC // TCC annotation on interface
    //@see io.seata.rm.tcc.api.TwoPhaseBusinessAction // TCC annotation on try method
    //@see io.seata.rm.tcc.remoting.RemotingParser // Remote TCC service parser
    //Corresponding interceptor:
    //@see io.seata.spring.tcc.TccActionInterceptor // the interceptor of TCC mode
    
    @Override
    //由于GlobalTransactionScanner继承了Spring提供的AbstractAutoProxyCreator，
    //所以Spring会把Spring Bean传递给GlobalTransactionScanner.wrapIfNecessary()进行判断；
    //让GlobalTransactionScanner来决定是否要根据Bean的Class、或者Bean的方法是否有上述注解，
    //从而决定是否需要针对Bean的Class创建动态代理，来对添加了注解的方法进行拦截；
    protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) {
        //do checkers
        if (!doCheckers(bean, beanName)) {
            return bean;
        }

        try {
            synchronized (PROXYED_SET) {
                if (PROXYED_SET.contains(beanName)) {
                    return bean;
                }
                interceptor = null;

                //check TCC proxy
                //判断传递进来的Bean是否是TCC动态代理
                //服务启动时会把所有的Bean传递进来这个wrapIfNecessary()，检查这个Bean是否需要创建TCC动态代理
                if (TCCBeanParserUtils.isTccAutoProxy(bean, beanName, applicationContext)) {
                    //init tcc fence clean task if enable useTccFence
                    TCCBeanParserUtils.initTccFenceCleanTask(TCCBeanParserUtils.getRemotingDesc(beanName), applicationContext);
                    //TCC interceptor, proxy bean of sofa:reference/dubbo:reference, and LocalTCC
                    interceptor = new TccActionInterceptor(TCCBeanParserUtils.getRemotingDesc(beanName));
                    ConfigurationCache.addConfigListener(ConfigurationKeys.DISABLE_GLOBAL_TRANSACTION, (ConfigurationChangeListener)interceptor);
                } else {
                    //获取目标class的接口
                    Class<?> serviceInterface = SpringProxyUtils.findTargetClass(bean);
                    Class<?>[] interfacesIfJdk = SpringProxyUtils.findInterfaces(bean);

                    //existsAnnotation()方法会判断Bean的Class或Method是否添加了@GlobalTransactional等注解
                    if (!existsAnnotation(new Class[]{serviceInterface}) && !existsAnnotation(interfacesIfJdk)) {
                        return bean;
                    }

                    if (globalTransactionalInterceptor == null) {
                        //构建一个GlobalTransactionalInterceptor，即全局事务注解的拦截器
                        globalTransactionalInterceptor = new GlobalTransactionalInterceptor(failureHandlerHook);
                        ConfigurationCache.addConfigListener(ConfigurationKeys.DISABLE_GLOBAL_TRANSACTION, (ConfigurationChangeListener)globalTransactionalInterceptor);
                    }
                    interceptor = globalTransactionalInterceptor;
                }

                LOGGER.info("Bean[{}] with name [{}] would use interceptor [{}]", bean.getClass().getName(), beanName, interceptor.getClass().getName());
                if (!AopUtils.isAopProxy(bean)) {//如果这个Bean并不是AOP代理
                    //接下来会基于Spring的AbstractAutoProxyCreator创建针对目标Bean接口的动态代理
                    //这样后续调用到目标Bean的方法，就会调用到TccActionInterceptor拦截器
                    bean = super.wrapIfNecessary(bean, beanName, cacheKey);
                } else {
                    AdvisedSupport advised = SpringProxyUtils.getAdvisedSupport(bean);
                    Advisor[] advisor = buildAdvisors(beanName, getAdvicesAndAdvisorsForBean(null, null, null));
                    int pos;
                    for (Advisor avr : advisor) {
                        //Find the position based on the advisor's order, and add to advisors by pos
                        pos = findAddSeataAdvisorPosition(advised, avr);
                        advised.addAdvisor(pos, avr);
                    }
                }
                PROXYED_SET.add(beanName);
                return bean;
            }
        } catch (Exception exx) {
            throw new RuntimeException(exx);
        }
    }
    ...
}

(2)TCCBeanParserUtils的isTccAutoProxy()方法判断是否要创建TCC动态代理

public class TCCBeanParserUtils {
    private TCCBeanParserUtils() {
    }

    //is auto proxy TCC bean
    public static boolean isTccAutoProxy(Object bean, String beanName, ApplicationContext applicationContext) {
        boolean isRemotingBean = parserRemotingServiceInfo(bean, beanName);
        //get RemotingBean description
        RemotingDesc remotingDesc = DefaultRemotingParser.get().getRemotingBeanDesc(beanName);
        //is remoting bean
        if (isRemotingBean) {
            if (remotingDesc != null && remotingDesc.getProtocol() == Protocols.IN_JVM) {
                //LocalTCC
                //创建一个local tcc代理
                return isTccProxyTargetBean(remotingDesc);
            } else {
                //sofa:reference / dubbo:reference, factory bean
                return false;
            }
        } else {
            if (remotingDesc == null) {
                //check FactoryBean
                if (isRemotingFactoryBean(bean, beanName, applicationContext)) {
                    remotingDesc = DefaultRemotingParser.get().getRemotingBeanDesc(beanName);
                    return isTccProxyTargetBean(remotingDesc);
                } else {
                    return false;
                }
            } else {
                return isTccProxyTargetBean(remotingDesc);
            }
        }
    }
    ...
    
    //is TCC proxy-bean/target-bean: LocalTCC , the proxy bean of sofa:reference/dubbo:reference
    public static boolean isTccProxyTargetBean(RemotingDesc remotingDesc) {
        if (remotingDesc == null) {
            return false;
        }
        //check if it is TCC bean
        boolean isTccClazz = false;
        //针对我们的class拿到一个接口class
        Class<?> tccInterfaceClazz = remotingDesc.getInterfaceClass();
        //获取我们的接口里定义的所有的方法
        Method[] methods = tccInterfaceClazz.getMethods();

        TwoPhaseBusinessAction twoPhaseBusinessAction;

        //遍历所有的方法
        for (Method method : methods) {
            //获取的方法是否加了@TwoPhaseBusinessAction注解
            twoPhaseBusinessAction = method.getAnnotation(TwoPhaseBusinessAction.class);
            if (twoPhaseBusinessAction != null) {
                isTccClazz = true;
                break;
            }
        }
        if (!isTccClazz) {
            return false;
        }
        short protocols = remotingDesc.getProtocol();
        //LocalTCC
        if (Protocols.IN_JVM == protocols) {
            //in jvm TCC bean , AOP
            return true;
        }
        //sofa:reference /  dubbo:reference, AOP
        return remotingDesc.isReference();
    }
    ...
}

4.Seata TCC案例分布式事务入口分析

TccTransactionService作为分布式事务的入口，其提交事务和回滚事务的接口都会被添加上@GlobalTransactional注解。

所以应用启动时，TccTransactionService的Bean就会被GlobalTransactionScanner扫描，然后其下添加了@GlobalTransactional注解的接口就会被创建动态代理。

在TccTransactionService的提交分布式事务的接口中，会先后调用TccActionOne和TccActionTwo两个Dubbo服务。并且在调用两个Dubbo服务时，会通过ApacheDubboTransactionPropagationFilter传递xid。

public class TccTransactionService {
    private TccActionOne tccActionOne;
    private TccActionTwo tccActionTwo;

    //提交分布式事务
    @GlobalTransactional
    public String doTransactionCommit() {
        //第一个TCC事务参与者
        boolean result = tccActionOne.prepare(null, 1);
        if (!result) {
            throw new RuntimeException("TccActionOne failed.");
        }
        List list = new ArrayList();
        list.add("c1");
        list.add("c2");
        //第二个TCC事务参与者
        result = tccActionTwo.prepare(null, "two", list);
        if (!result) {
            throw new RuntimeException("TccActionTwo failed.");
        }
        return RootContext.getXID();
    }

    //回滚分布式事务
    @GlobalTransactional
    public String doTransactionRollback(Map map) {
        //第一个TCC事务参与者
        boolean result = tccActionOne.prepare(null, 1);
        if (!result) {
            throw new RuntimeException("TccActionOne failed.");
        }
        List list = new ArrayList();
        list.add("c1");
        list.add("c2");
        //第二个TCC事务参与者
        result = tccActionTwo.prepare(null, "two", list);
        if (!result) {
            throw new RuntimeException("TccActionTwo failed.");
        }
        map.put("xid", RootContext.getXID());
        throw new RuntimeException("transacton rollback");
    }

    public void setTccActionOne(TccActionOne tccActionOne) {
        this.tccActionOne = tccActionOne;
    }
    
    public void setTccActionTwo(TccActionTwo tccActionTwo) {
        this.tccActionTwo = tccActionTwo;
    }
}

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