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使用model cache给你的GAE应用程序加速

Wednesday, June. 10. 2009 –  Category: GAE 开发  –  2 Comments
Tags: memcache  datastore  topStory 

使用model cache给你的GAE应用程序加速
刚刚看到gae group里面的一片文章，里面实现了一个利用memcache来进行model cache的方法。
使用非常简单，而且加速效果明显:-)在这里分享下:D

原文在这：google group讨论

http://appengine-cookbook.appspot.com/recipe/seamless-memcache-caching-of-all-entities/


使用很简单，在你的models.py 最上方

然后就可以享受memcache带来的急速体验了:-)
他的一些优点和限制：
. All entities will be cached in memcache as they pass through this api proxy. Your get requests will be served out of memcache if there is a hit. The cache is updated through:

- puts
- gets
- queries

Limitations:
- The cache is completely pessimistic in the case of transactions. In case of a request that is part of a transaction:
* gets are not served from the cache
* puts/deletes invalidate those entities from the cache when they commit
* puts/deletes do not change the cache if they rollback
- If your entity keys are larger than the size allowed for memcache keys the cache will fail

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