下面是一个简单的Java代码示例，演示了如何使用Saga模式实现柔性事务：

// 定义一个Saga事务
public class SagaTransaction {
     
       
    private List<TransactionStep> steps;

    public SagaTransaction() {
     
       
        this.steps = new ArrayList<>();
    }

    public void addStep(TransactionStep step) {
     
       
        steps.add(step);
    }

    public void execute() {
     
       
        for (TransactionStep step : steps) {
     
       
            try {
     
       
                step.execute();
            } catch (Exception e) {
     
       
                // 发生异常时执行回滚操作
                rollback();
                throw e;
            }
        }
    }

    private void rollback() {
     
       
        // 逆序执行每个步骤的回滚操作
        for (int i = steps.size() - 1; i >= 0; i--) {
     
       
            TransactionStep step = steps.get(i);
            try {
     
       
                step.rollback();
            } catch (Exception e) {
     
       
                // 处理回滚异常，可以记录日志或采取其他措施
            }
        }
    }
}

// 定义一个Saga事务步骤
public interface TransactionStep {
     
       
    void execute();

    void rollback();
}

// 示例：转账操作的Saga事务步骤
public class TransferStep implements TransactionStep {
     
       
    private Account fromAccount;
    private Account toAccount;
    private BigDecimal amount;

    public TransferStep(Account fromAccount, Account toAccount, BigDecimal amount) {
     
       
        this.fromAccount = fromAccount;
        this.toAccount = toAccount;
        this.amount = amount;
    }

    @Override
    public void execute() {
     
       
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
    }

    @Override
    public void rollback() {
     
       
        toAccount.withdraw(amount);
        fromAccount.deposit(amount);
    }
}

// 示例：账户类
public class Account {
     
       
    private String accountId;
    private BigDecimal balance;

    // 省略构造函数和其他方法

    public void withdraw(BigDecimal amount) {
     
       
        // 执行提款操作
        // ...
    }

    public void deposit(BigDecimal amount) {
     
       
        // 执行存款操作
        // ...
    }
}

// 在应用程序中创建Saga事务并执行
public class Application {
     
       
    public static void main(String[] args) {
     
       
        // 创建账户对象
        Account fromAccount = new Account("A001", new BigDecimal("1000.00"));
        Account toAccount = new Account("A002", new BigDecimal("500.00"));

        // 创建Saga事务并添加步骤
        SagaTransaction sagaTransaction = new SagaTransaction();
        sagaTransaction.addStep(new TransferStep(fromAccount, toAccount, new BigDecimal("200.00")));
        sagaTransaction.addStep(new TransferStep(toAccount, fromAccount, new BigDecimal("100.00")));

        // 执行Saga事务
        try {
     
       
            sagaTransaction.execute();
            System.out.println("事务执行成功");
        } catch (Exception e) {
     
       
            System.out.println("事务执行失败");
            // 处理事务执行失败的情况
        }
    }
}