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https://issues.apache.org/jira/browse/LUCENE-8042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-8042:
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Attachment: LUCENE-8042.patch
This patch should simplify things a bit for implementers. Instead of directly
exposing IndexReader.CacheHelper, getCacheHelper(LeafReaderContext) is now
moved to an inner CacheLevel class. SegmentCachable declares a single
getCacheLevel() method, and implementers can return one of the following:
* CacheLevel.SEGMENT for stuff that's always cachable
* CacheLevel.DOCVALUES(field) for things using docvalues
* CacheLevel.NEVER for stuff that's never cachable
Retrieving CacheHelpers and comparing different levels of cache is all done
within the CacheHelper class itself.
> Add SegmentCachable interface
> -----------------------------
>
> Key: LUCENE-8042
> URL: https://issues.apache.org/jira/browse/LUCENE-8042
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Attachments: LUCENE-8042.patch, LUCENE-8042.patch
>
>
> Following LUCENE-8017, I tried to add a getCacheHelper(LeafReaderContext)
> method to DoubleValuesSource so that Weights that use DVS can delegate on.
> This ended up with the same method being added to LongValuesSource, and some
> of the similar objects in spatial-extras. I think it makes sense to abstract
> this out into a separate SegmentCachable interface.
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