ASP.NET缓存层与业务逻辑层

Question

I'm looking for some helpful advice on how the caching layer in an ASP.NET project should work with the business logic layer. Specifically, should the caching layer handle only cached/cachable objects and pass other functions straight-through to the BLL or should the caching layer almost take the place of the BLL and leave that to just being the bridge between the caching layer and the DAL?

A good example of this and the one that has me scratching my head is basket functionality on an ecommerce website. Pre-caching layer, items were added to cart via the BLL to the DAL. At the BLL there's lots of logic for checking types of items etc. Should the caching layer now take responsibility for some of this logic or just pull the cached info together and pass it all through to the BLL?

I'd appreciate anyone's help on this.

Answer 1

It all depends on what you are caching. If I understood your question correctly, the caching in your scenario take the place of your data source; it doesn't replace your business logic or other layers. In your shopping basket example, when you put the items in the basket, you cache those items so that you don't have to get them from their permanent storage often. However, if you have a logic that needs to check the items frequently, then you still do that, but by checking the items in the cached basket.