Most custom sweepers observe some model object, and based on changes, fire logic to expire one or more cache pages.
多数定制清理器都会观察某些模型对象，并根据更改击发逻辑来使一个或多个缓存页面到期失效。
The 30 day cache solves the user-error problem and the fact that data is stored on the Internet solves the fire/flood/theft issue (where USB or network drives may also be affected).
30天的缓存解决了用户错误的问题，同时由于数据存储在互联网上，也就避免了火灾、洪水和盗窃的问题（而USB和网络硬盘是无法避免这些问题的）。
When that event fires, the sweeper will fire, and can invalidate selected pages in the cache.
当此事件击发时，清理器也会击发，并可让缓存内的特定页面到期失效。
These classes delete selected elements from your cache when certain controller actions fire.
在某些控制器击发时，这些类会从缓存内删除选定的元素。
These classes delete selected elements from your cache when certain controller actions fire.
在某些控制器击发时，这些类会从缓存内删除选定的元素。
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