# Structs
SimpleAttributeAccessorSupport 属性访问方法.
# Interfaces
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RecoverCallback 在重试耗尽后的回调处理.
RtyCallback 重试操作的回调接口.
RtyContext 重试上下文.
RtyListener 重试监听，可以用于在重试时增加其他的行为.
RtyOperations 定义一组重试操作，这组操作根据配置的重试行为进行重试.
RtyPolicy 用于分配和管理重试操作.
RtyState Stateful retry is characterised by having to recognise the items that are being processed, so this interface is used primarily to provide a cache key in between failed attempts.