Add hooks to RequestHandlers so they can be more easily extended
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                 Key: SOLR-387
                 URL: https://issues.apache.org/jira/browse/SOLR-387
             Project: Solr
          Issue Type: Improvement
          Components: search
    Affects Versions: 1.2
            Reporter: Brian Durand
            Priority: Trivial
             Fix For: 1.2


I have found a couple of instances where I need to hook code in to modify the 
queries sent to RequestHandler and DisMaxRequestHandler before they are 
executed. The structure of these classes under Solr 1.2 does not lend itself to 
this type of extension. I have a patch which adds an additional method:

    public void addCustomBehavior (SolrQueryRequest req, SolrQueryResponse rsp, 
List<Query> queries, List<SortField> sortFields)

Subclasses of the request handlers can then implement this method to hook in 
their custom code.

This code fix would be made obsolete by SOLR-281 (Search Component Plugins)

https://issues.apache.org/jira/browse/SOLR-281

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