Can I set up Sitecore ContentSearch to use a separate Search- and Requesthandler on SOLR per site?

Question

As the question says; do I have any options of setting/defining my own Search- and Request-Handlers for Sitecore ContentSearch, based on the active site?

Skimming through ContentSearch configs, I'm not even sure where the default SearchHandler is defined, much less if there is code anywhere than I can hook into, to control it.

Example:

Scenario could be; where we have say /products and /productsinstock search handlers; where the latter one would - as an example - the following filter added.

<lst name="appends">
  <str name="fq">inStock:true</str>
</lst>

Answer 1

So out of the box it is not possible to use different search handler through Sitecore SOLR content search. Sitecore's SOLR implementation is based on SOLR.NET, which hard codes the search handler to use in the "SolrQueryExecuter" class.

/// <summary>
/// Default Solr query handler
/// </summary>
public static readonly string DefaultHandler = "/select";

The DefaultHandler to use from the SolrQueryExecuter class. The original code can be found here. https://github.com/mausch/SolrNet/blob/master/SolrNet/Impl/SolrQueryExecuter.cs

You could implement your own executer class an patch it through the SolrNET Startup container you are using.

 Register<ISolrQueryExecuter<T>>(c => new SolrQueryExecuter<T>(c.GetInstance<ISolrAbstractResponseParser<T>>(), connection, c.GetInstance<ISolrQuerySerializer>(), c.GetInstance<ISolrFacetQuerySerializer>(), c.GetInstance<ISolrMoreLikeThisHandlerQueryResultsParser<T>>()));

The initialization code for the default SolrQueryExecuter do in the SolrNET.Startup.Init method. The Original code can be found here: https://github.com/mausch/SolrNet/blob/master/SolrNet/Startup.cs

The SolrNET.Startup.Container is a public property, and thus can be altered.

However this will not give you the option to choose which one to use on query time.