Complete overhaul of FieldCache API/Implementation
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Key: LUCENE-831
URL: https://issues.apache.org/jira/browse/LUCENE-831
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Hoss Man
Motivation:
1) Complete overhaul the API/implementation of "FieldCache" type things...
a) eliminate global static map keyed on IndexReader (thus
eliminating synch block between completley independent IndexReaders)
b) allow more customization of cache management (ie: use
expiration/replacement strategies, disk backed caches, etc)
c) allow people to define custom cache data logic (ie: custom
parsers, complex datatypes, etc... anything tied to a reader)
d) allow people to inspect what's in a cache (list of CacheKeys) for
an IndexReader so a new IndexReader can be likewise warmed.
e) Lend support for smarter cache management if/when
IndexReader.reopen is added (merging of cached data from subReaders).
2) Provide backwards compatibility to support existing FieldCache API with
the new implementation, so there is no redundent caching as client code
migrades to new API.
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