OSQueryCache concurrency improvements
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Key: CAY-685
URL: http://issues.apache.org/cayenne/browse/CAY-685
Project: Cayenne
Type: Improvement
Components: Cayenne Core Library
Versions: 3.0
Reporter: Andrus Adamchik
Assigned to: Andrus Adamchik
Priority: Minor
Fix For: 3.0
OSQueryCache.get(QueryMetadata) exists immiately on cache miss, returning null, instead of filling the cache per advice given here:
http://wiki.opensymphony.com/display/CACHE/API+Usage
This works, but results in poor concurrency - if multiple threads run the same query simultaneously, the query will be executed multiple times, with last returning thread overriding the cache, so cache entry expiration results in spike of activity on a loaded server...
To fix this we may need to reengineer the query pipeline (pass a "result factory" object to the cache, so that the query can be executed inside the cache provider).
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