一般来说，您会借由在管理快取资料的商务物件中，建立处理常式以实作回呼。

Typically, you implement the callback by creating a handler in a business object that manages the cache data.

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这些商务物件会在展示层和资料层之间构成一个层级，形成三层式应用程序架构。

These business objects form a layer between the presentation layer and the data tier, resulting in a three-tier application architecture.

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然而，常见的应用程序设计是将展示层与商务逻辑分开，并且将商务逻辑封装在商务物件中。

However, a common application design practice is to separate the presentation layer from business logic and encapsulate the business logic in business objects.

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