金融项目高可用分布式TCC-Transaction(开源框架)

跨行转账：TCC解决银行间账户余额同步问题

订单支付：Try阶段预扣库存，Confirm阶段实际扣款

对账系统：批量交易的事务一致性保障

一、添加依赖

xml 复制代码

<!-- Maven 依赖 -->
<dependency>
    <groupId>org.mengyun</groupId>
    <artifactId>tcc-transaction-core</artifactId>
    <version>1.2.0</version>
</dependency>
<dependency>
    <groupId>org.mengyun</groupId>
    <artifactId>tcc-transaction-spring</artifactId>
    <version>1.2.0</version>
</dependency>

二、SpringBoot配置

yml 复制代码

#application.yml
tcc:
  transaction:
    repository:
      type: redis  # 事务日志存储类型（支持JDBC、ZooKeeper等）
      redis:
        host: 127.0.0.1
        port: 6379
    recover:
      cron: "0 */1 * * * ?"  # 定时任务补偿间隔（默认1分钟）

三、TCC接口与实现

java 复制代码

@Conpensable(
	confirmMethod = "confirmTransfer",
	cancelMethod = "cancelTransfer",
	asyncConfirm = false //是否异步Confirm（高并发场景建议true）
)
public interface PaymentService{
	
	@Transactional
	boolean tryTransfer(
		@BusinessActionContextParameter(paramName = "fromAccount") String fromAccount,
        @BusinessActionContextParameter(paramName = "toAccount") String toAccount,
        @BusinessActionContextParameter(paramName = "amount") BigDecimal amount
	);

	boolean confirmTransfer(BusinessActionContext context);

	boolean canelTransfer(BusinessActionContext context);
}

java 复制代码

@Service
public class PaymentServiceImpl implements PaymentService {

    @Autowired
    private AccountDao accountDao;
	
	@Override
    public boolean tryTransfer(String fromAccount, String toAccount, BigDecimal amount) {
        // 1. Try阶段：资源预留（冻结余额）
        Account account = accountDao.selectForUpdate(fromAccount);
        if (account.getBalance().compareTo(amount) < 0) {
            throw new InsufficientBalanceException();
        }
        accountDao.freezeAmount(fromAccount, amount);  // 生成冻结记录
        
        // 2. 记录事务上下文（自动由框架处理）
        return true;
    }

    @Override
    public boolean confirmTransfer(BusinessActionContext context) {
        // 3. Confirm阶段：实际扣款
        String fromAccount = context.getActionContext("fromAccount");
        BigDecimal amount = context.getActionContext("amount");
        accountDao.decreaseBalance(fromAccount, amount);
        accountDao.unfreezeAmount(fromAccount, amount);
        return true;
    }

    @Override
    public boolean cancelTransfer(BusinessActionContext context) {
        // 4. Cancel阶段：释放冻结资金
        String fromAccount = context.getActionContext("fromAccount");
        BigDecimal amount = context.getActionContext("amount");
        accountDao.unfreezeAmount(fromAccount, amount);
        return true;
    }
}

四、启动TCC事务

java 复制代码

@Service
public class TransferFacade {
    @Autowired
    private PaymentService paymentService;
    @Autowired
    private TransactionRepository transactionRepository;

    @Transactional
    public void executeTransfer(String fromAccount, String toAccount, BigDecimal amount) {
        // 1. 创建事务上下文
        TransactionContext context = new TransactionContext();
        context.setPropagated(true);

        // 2. 执行Try阶段
        boolean tryResult = paymentService.tryTransfer(fromAccount, toAccount, amount);
        if (!tryResult) {
            throw new TryPhaseException("Try阶段失败");
        }

        // 3. 模拟其他服务调用（如风控检查）
        riskCheckService.validate(fromAccount, amount);

        // 4. 事务自动提交（框架自动触发Confirm）
    }
}