Github user samaitra commented on the pull request:
https://github.com/apache/jena/pull/95#issuecomment-158991909
The CacheEntry is a wrapper object to hold the Query ResultSet and data
byte array. The CacheAction is used to make a decision on filling the cache or
read from cache. The design is based on an issue that I faced during iterating
over result for select queries. The ask,construct and describe queries
ResultSet can be cached and data can be fetched from cache but incase of select
queries while iterating over results I faced error as ResultSet is closed,
Query execution error. So, only caching the ResultSet is not sufficient to
build the response body for select queries. This is also the reason while I
needed to replicate the ResultSet data while it is written to ServletOut.
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