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https://issues.apache.org/jira/browse/SOLR-281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564449#action_12564449
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Michael Dodsworth commented on SOLR-281:
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This is great; decomposing the handler and allowing the components to be wired
up in the config really helps development (and maintenance of those changes).
For my purposes, I needed to make a change to the way the dismax query was
being generated. Using the DisMaxQParserPlugin as a template, I created my own
QParser and associated QParserPlugin; changed the relevant bits; added a
<queryParser...> entry in solrconfig.xml; added the 'defType' parameter to the
wanted SearchHandler configuration...and...all works well.
Just a few comments:
* I had to make the QParser parse() method public (as the new query parser may
still need to use the existing query parsers (backup lucene parser, boost
parser, function parser, etc).
* The QParserPlugin class seems unnecessary: all it does is implement init()
and add a createParser method. Why not just have the parser constructor take
those arguments...or, if that can't be done, create an interface to allow the
parser itself implement both init() and createParser() (or create()). It then
avoids having to create 2 classes (in the case of DisMax, in the same
file...which is not pretty).
> Search Components (plugins)
> ---------------------------
>
> Key: SOLR-281
> URL: https://issues.apache.org/jira/browse/SOLR-281
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Ryan McKinley
> Assignee: Ryan McKinley
> Fix For: 1.3
>
> Attachments: SOLR-281-ComponentInit.patch,
> SOLR-281-ComponentInit.patch, SOLR-281-SearchComponents.patch,
> SOLR-281-SearchComponents.patch, SOLR-281-SearchComponents.patch,
> SOLR-281-SearchComponents.patch, SOLR-281-SearchComponents.patch,
> SOLR-281-SearchComponents.patch, SOLR-281-SearchComponents.patch,
> SOLR-281-SearchComponents.patch, SOLR-281-SearchComponents.patch,
> solr-281.patch, solr-281.patch, solr-281.patch
>
>
> A request handler with pluggable search components for things like:
> - standard
> - dismax
> - more-like-this
> - highlighting
> - field collapsing
> For more discussion, see:
> http://www.nabble.com/search-components-%28plugins%29-tf3898040.html#a11050274
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