tcc-transaction 与Dubbo整合后，三层事务方法，底层服务无法confirm或cancel的问题

[bigcoder84]

您好，最近再查看tcc-transaction最新源码时发现了一些疑问，特此请教一下
假设现在有三个服务 A->B->C ，A为顶层服务，C为底层服务。如果我在B的实现上加上@Copensable注解，并指明transactionContextEditor为DubboTransactionContextEditor，那么在B服务执行时，并不会创建C服务的事务参与者（Participant），所以在B事务cancel或者confirm后，并不会调用C服务去回滚或者confirm。
查看源码后得知，是因为B服务，在被执行前从Dubbo上下已经获取到了TransactionContext信息，所以在CompensableTransactionFilter中调用ResourceCoordinatorInterceptor#interceptTransactionContextMethod方法时，ParticipantRole被判定为NOMAL，导致未创建C服务的事务参与者信息，最终导致分支事务B在cancel/confirm时无法cancel/confirm事务参与者C的问题，为此我非常疑惑，请问此种设计是有什么特殊考虑吗

[bigcoder84]

示例代码如下：

@DubboService(timeout = 900000000, cluster = "failfast")
public class AService implements IAService { 
    
    @DubboReference
    private IBService bService;

    @Override
    @Compensable(confirmMethod = "confirmOrder", cancelMethod = "cancelOrder")
    public int placeOrder(OrderDTO orderDTO) {
        // ...
        int result = bService.placeOrder(inventoryOrderDTO);
        return 0;
    }
}

public interface IBService {

    @EnableTcc
    int placeOrder(InventoryOrderDTO orderDTO);
}

@DubboService(timeout = 900000000, cluster = "failfast")
public class BService implements IBService {
    @DubboReference
    private cService cService;
    
    @Override
    @Compensable(confirmMethod = "confirmOrder", cancelMethod = "cancelOrder", transactionContextEditor = DubboTransactionContextEditor.class)
    public int placeOrder(InventoryOrderDTO inventoryOrderDTO) {
        log.info("tryOrder");
        cService.placeOrder(redpackOrderDTO);
        return 0;
    }

}

public interface ICService {

    @EnableTcc
    int placeOrder(InventoryOrderDTO orderDTO);
}

@DubboService(timeout = 900000000, cluster = "failfast")
public class CService implements ICService {
    
    @Override
    @Compensable(confirmMethod = "confirmOrder", cancelMethod = "cancelOrder", transactionContextEditor = DubboTransactionContextEditor.class)
    public int placeOrder(InventoryOrderDTO inventoryOrderDTO) {
        log.info("tryOrder");
        return 0;
    }

}

[bigcoder84]

#334 PR中修复了该问题

[changmingxie]

@bigcoder84 在1.8.0版中修复。