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应用初始化时若无法连接txmanager 将无法启动，但服务有可能已注册，有很大风险出现服务不可用-改为异步初始化 当 txmanager 连接失败时，退化到无分布式事务，原来是会抛异常
* 标示本服务是否是只读
* 若为true : 不会加入事务组; Connection 不会被 Wrap
* 在本服务无DB操作或仅有查询时请配置 true 将提高性能
* 若应用都没有DB配置，此配置无意义不用设值
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txc 与 优化 |
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修改切面order值。为其他切面预留切入点。
将分布式事务框架依赖弱化。 提高容错性，txmanager 异常 或 redis异常（还没做redis异常检测）时，系统退化到无分布式事务状态，而不是服务不可用。
新增了分布式事务处理模式：类似undolog 反SQL模式。命名为TXC模式