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https://issues.apache.org/jira/browse/SOLR-243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500219
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Yonik Seeley commented on SOLR-243:
-----------------------------------

Minor nit: is there a reason that IndexReaderFactory can't be a class instead 
of an interface?
It doesn't seem to be a likely candidate for multiple inheritance, and making 
it a class allows us to "upgrade" the interface in the future while providing a 
backward compatible default implementation for people who have already 
implemented it.


> Create a hook to allow custome code to create custome index readers
> -------------------------------------------------------------------
>
>                 Key: SOLR-243
>                 URL: https://issues.apache.org/jira/browse/SOLR-243
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 1.3
>         Environment: Solr core
>            Reporter: John Wang
>             Fix For: 1.3
>
>         Attachments: indexReaderFactory.patch, indexReaderFactory.patch
>
>
> I have a customized IndexReader and I want to write a Solr plugin to use my 
> derived IndexReader implementation. Currently IndexReader instantiation is 
> hard coded to be: 
> IndexReader.open(path)
> It would be really useful if this is done thru a plugable factory that can be 
> configured, e.g. IndexReaderFactory
> interface IndexReaderFactory{
>      IndexReader newReader(String name,String path);
> }
> the default implementation would just return: IndexReader.open(path)
> And in the newSearcher and getSearcher methods in SolrCore class can call the 
> current factory implementation to get the IndexReader instance and then build 
> the SolrIndexSearcher by passing in the reader.
> It would be really nice to add this improvement soon (This seems to be a 
> trivial addition) as our project really depends on this.
> Thanks
> -John

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