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https://issues.apache.org/jira/browse/LUCENE-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12982604#action_12982604
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Michael McCandless commented on LUCENE-2474:
--------------------------------------------
Ahh, I get it -- invoking the listeners (on cache evict) is dangerous to do
under a global lock since they could conceivably be costly.
I had switched to Set to try to prevent silliness in the event that an app adds
same listener over & over (w/o removing it), and also to not have O(N^2) cost
when removing listeners. I mean, it is an expert API, but I still think we
should attempt to be defensive against silliness?
How about CHM? (There is not builtin CHS, right? And HS just wraps an HM
anyway....).
> Allow to plug in a Cache Eviction Listener to IndexReader to eagerly clean
> custom caches that use the IndexReader (getFieldCacheKey)
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2474
> URL: https://issues.apache.org/jira/browse/LUCENE-2474
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Shay Banon
> Attachments: LUCENE-2474.patch, LUCENE-2474.patch
>
>
> 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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