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For those who are not happy with those choices, I offer this proposal to use a) Apache Solr and b) some improvements to Roller's plugin plug-in infrastructure to enable a clusterablecluster-able search implementation in Roller.

Design

The basic idea is to embed the Apache Solr a search engine in Roller. Solr maintains a search index and can perform queries against that index and all of this can be done via web services. To be continued...

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, one that has a web services interface. In a cluster, one instance of Roller will run this embedded search engine and all instances will call it via web services to index, re-index, de-index and search. This will make Roller's search facility cluster-able.

Here's the plan in four steps.

ONE. Embed Solr search engine in Roller, and expose it's web services interface

• allow it to run on one host of the system
• all hosts will call the search service via web servicesintroduce
• implementation:
  • include Solr jars
  • add Solr Servlet to web.xml, ensure it abides by Roller's search configuration properties
  • enable authentication

Introduce WeblogListener and supporting infrastructure in manager implementations that do CRUD on entries and comments. Here's a rough outline of the plug-in interface, which is still TBD.

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/** implement this to get notification of changes to Roller weblogs */
public interface WeblogListerner {
   entryAdded()
   entryUpdated()
   entryRemoved()
   spamCommentDetected()
   commentAdded()
   commentUpdated()
   commentRemoved()
}

TWO. Create a

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new SolrSearchManager implementation that calls Solr Web Services to manage the index, perform searches, etc. This may require some changes to the SearchManager interface and work to keep the Lucene implementation in sync.

THREE. Create a SearchWeblogListener implementation that indexes, re-indexes and de-indexes as needed by calling the SearchManager interface.

FOUR. Replace calls in Struts actions to search manager for indexing, re-indexing, etc. They are no longer needed now that SearchWeblogListener is in place.

And we're done. Folks who want clustering can use the new SolrSearchManager, folks who don't can continue to use LucenseSearchManager.