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From "Michael McCandless (JIRA)" <>
Subject [jira] Updated: (LUCENE-2394) Factories for cache creation
Date Tue, 01 Jun 2010 18:21:40 GMT


Michael McCandless updated LUCENE-2394:

    Fix Version/s: 4.0
                       (was: 3.0.2)
                       (was: 2.9.3)

Moving fix version -> 4.0.

> Factories for cache creation
> ----------------------------
>                 Key: LUCENE-2394
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Oswaldo Dantas
>             Fix For: 4.0
>         Attachments: factoriesPatch.patch
> 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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