Factories for cache creation
----------------------------
Key: LUCENE-2394
URL: https://issues.apache.org/jira/browse/LUCENE-2394
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Oswaldo Dantas
Fix For: 2.9.3, 3.0.2
Hello all,
I've seen the LUCENE-831 (Complete overhaul of FieldCache API/Implementation)
targeted for version 3.1 and I think that maybe, before this overhaul, it would
be good to have a more cirurgical change, that would need smaller effort in new
unit tests, without behavior changes and almost no performance impact.
One way to achieve that is inserting strategically positioned calls to a
factory structure that would allow every already developed code to continue
working without changes, at the same time giving the opportunity to put
alternative factories to work.
Focusing on the cache idea (not specifically the FieldCache, that has it's own
specific responsabilities, but in the key/value structure that will ultimately
hold the cached objects) i've done the small change contained in the patch I'm
attaching to this.
It has default implementations that encapsulate what was being originally used
in FieldCache, so all current test cases passes, and creates the possibility to
create a EHCacheFactory or InfinispanCacheFactory, or even
MyOwnCachingStructureFactory.
With this, it would be easy to take advantage of the features provided by this
kind of project in a uniform way and rapidly allowing new possibilities in
scalability and tuning.
The code in the patch is small (16kb file is small if compared to the hundreds
of kbs in other patchs) and even though it doesn't have javadoc right now
(sorry) I hope it can be easly understood. So, if Lucene maintainers see that
this contribution could be used (in a 2.9.n+1 and 3.0.n+1 and maybe influencing
future versions) we could put some more effort in it, documenting, adding
necessary unit tests and maybe contributing other factory implementations.
What do you think?
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