Data caching for Web applications at the Business Layer
Source: Internet
Author: User
Recently, a web project used a lot of custom data, some of which were saved in XML files and some of which were saved in databases. After the system was officially used, in fact, it will not change frequently, but it will be used frequently. A natural idea is to put the data into the cache, which can greatly improve the efficiency. however, I haven't found a way to use cache on the business layer for a long time. the business layer uses the single-piece mode to put the data to be cached into an arraylist. When used, if the data in the arraylist is empty, it will retrieve the data again and provide a method to clear it, create a cache based on the dependent configuration file on the pages of the data to be used in the web layer, and provide a callback function. When the configuration file changes, clear the arrarylist data, re-create the cache (the original cache has expired. If you want to create it again next time, you only need to create it again ). obviously, this is abnormal, which not only destroys the original Concise structure, but also adds more work. unhappy. fortunately, I finally found it. for ASP.. NET environment, you can use the system. web. httpruntime. cache to access the cache. With this, everything is easy to do. Just move the cache creation directly to the business.
It is a pity that the data in the database cannot be cached using this method (of course, the single-piece mode and the auxiliary method can be used to improve the efficiency, but it is awkward. under X, the cache only provides time-based, keyword-based, and file creation dependencies. The good news is that in 2.0, the database-based creation of cache Dependencies has been provided, and we are eager to look forward to vs2005!
In addition, system. web. httpruntime. appdomainappvirtualpath is used to find the virtual directory of the current application, system. web. httpcontext. current and page in the page background. context is equivalent, and may be useful in many cases. however, if these methods are used at the underlying layer, the coupling between components is added, and these components can only be used on the web.
If other friends have a good way or method, please advise.
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