如果操作失败，则意味着这是会话首次调用这个触发器函数。

If it fails, this means that it is the first time this session called this trigger function.

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事实上，整个请求被重新进行处理，直到首次调用suspend 。

In effect, the entire request is "replayed" up until the point where suspend was first called.

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首次调用服务时，入口点由一个start值显式地初始化。

The first time the service is invoked, the entry point is obviously initialized with a start value.

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