使用kadmin定义处理密码及其存活期的策略。
Define the policy for handling passwords and its lifetime using kadmin.
单个事件对象的存活期非常短，在其消失之前刚够时间进行即时处理。
An individual event object is short-lived, and exists only long enough for immediate processing before it ceases to be.
此方法的缺点是，终结器的存在意味着对象的存活期比其他情况下更长。
The disadvantage of this approach is that the existence of the finalizer means that the object is kept alive longer than it otherwise would be.
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