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https://issues.apache.org/jira/browse/LUCENE-2510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269551#comment-13269551
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Robert Muir commented on LUCENE-2510:
-------------------------------------
re: what is the purpose of the newInstance method?
{quote}
If you take a look at
org.apache.solr.analysis.DelimitedPayloadTokenFilterFactory you'll see an
example of how it's used.
Looking at the implementation in SolrResourceLoader, it seems to facilitate two
things:
The use of simplified solr.* package names
In FSTSynonymFilterFactory for example, newInstance is used to load other
components. Consequently bq. bq. SolrResourceLoader adds the instantiated
classes to its tracking of SolrCoreAware, ResourceLoaderAware, bq. etc.
With all that said, its only used in 3 Factories (but a lot of other Solr
code). Perhaps we can break it bq. out somehow.
{quote}
I think we should revisit this. I don't like placing this into the analyzers
module when not many factories actually use it, instead a lot of unrelated code
in solr actually uses it. I think this could cause a mess.
On the other hand, both the things this provides can be achieved in other ways.
For example, if we use NamedSPILoader instead to allow components such as
factories to be found by name, then we can support
"solr.WhitespaceTokenizerFactory" because
TokenizerFactory.forName("WhitespaceTokenizerFactory") works. Using the SPI
mechanism would allow for us to have completely pluggable analysis modules,
also operations like listAll() work in case you want to enumerate a list
(imagine someone that doesnt want a xml configuration but configured by a GUI
or something like that instead). We also keep sane packaging within the
analysis modules and keep type safety, and solr still keeps its solr.XXX syntax
without reflecting a zillion packages or other crazy things.
> migrate solr analysis factories to analyzers module
> ---------------------------------------------------
>
> Key: LUCENE-2510
> URL: https://issues.apache.org/jira/browse/LUCENE-2510
> Project: Lucene - Java
> Issue Type: Task
> Components: modules/analysis
> Affects Versions: 4.0
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-2510-parent-classes.patch,
> LUCENE-2510-parent-classes.patch, LUCENE-2510-resourceloader-bw.patch,
> LUCENE-2510.patch, LUCENE-2510.patch, LUCENE-2510.patch
>
>
> In LUCENE-2413 all TokenStreams were consolidated into the analyzers module.
> This is a good step, but I think the next step is to put the Solr factories
> into the analyzers module, too.
> This would make analyzers artifacts plugins to both lucene and solr, with
> benefits such as:
> * users could use the old analyzers module with solr, too. This is a good
> step to use real library versions instead of Version for backwards compat.
> * analyzers modules such as smartcn and icu, that aren't currently available
> to solr users due to large file sizes or dependencies, would be simple
> optional plugins to solr and easily available to users that want them.
> Rough sketch in this thread:
> http://www.lucidimagination.com/search/document/3465a0e55ba94d58/solr_and_analyzers_module
> Practically, I havent looked much and don't really have a plan for how this
> will work yet, so ideas are very welcome.
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