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cqrs-axon-demo's Issues

请问这个demo是如何解决事务问题的?

我在代码中看到只是发送event到了mq中,但是并没有解决事务问题
commandBus 发送了 command 后,后面就是异步执行的了,在发送event的过程中如果宕机或者网络中断,那么evnet就存在没有发送成功的可能,这时候业务怎么处理呢?
event我也没看到重发,或者利用持久化的机制来进行存储,以便下次恢复的时候重发.
对于最终一致性我还有一个比较大的疑惑,
例如 我集群中存在 3台服务器,使用event来达到一致性
有一个需要检查余额才能进行的业务,某用户余额现有1000元,第一次调用转出900,发送了转出900的事件,3台服务器其中的两台都已经消费了事件,另外一台消费较慢(服务器配置不好)
现在,用户又点击一次转出900,刚好命中消费较慢的那一台,那么 这台服务器怎么判断该用户是否有足够的钱转出呢? 或者说有什么办法可以解决这样的问题呢?

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