OSQueryCache concurrency improvements
Components: Cayenne Core Library
Reporter: Andrus Adamchik
Assigned to: Andrus Adamchik
Fix For: 3.0
OSQueryCache.get(QueryMetadata) exists immiately on cache miss, returning null, instead of filling the cache per advice given here:
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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