Allow to plug in a Cache Eviction Listener to IndexReader to eagerly clean
custom caches that use the IndexReader (getFieldCacheKey)
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Key: LUCENE-2474
URL: https://issues.apache.org/jira/browse/LUCENE-2474
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Shay Banon
Allow to plug in a Cache Eviction Listener to IndexReader to eagerly clean
custom caches that use the IndexReader (getFieldCacheKey).
A spin of: https://issues.apache.org/jira/browse/LUCENE-2468. Basically, its
make a lot of sense to cache things based on IndexReader#getFieldCacheKey, even
Lucene itself uses it, for example, with the CachingWrapperFilter. FieldCache
enjoys being called explicitly to purge its cache when possible (which is
tricky to know from the "outside", especially when using NRT - reader attack of
the clones).
The provided patch allows to plug a CacheEvictionListener which will be called
when the cache should be purged for an IndexReader.
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