Coding best practice : Lucene search query : resultSet.close()

Just want to share a very important coding best practice if you are using Lucence search query in Alfresco : do not forget to close the ResultSet object (org.alfresco.service.cmr.search.ResultSet) at the end of your treatments.

This is very important to avoid disk space issue (and also probably memory leak issue). Indeed, if the ResultSet object is not closed properly, then it seems that Lucene will have to “keep it on disk” as a “piece of Lucene index” (serialization here ?) and this block will not be removed by the “index cleaner process”. So space of Lucene index will continue to grow indefinitely….

There are a lots of  ” ” here, but I think you understand that this could be a major issue.

Code sample:

try {

 ResultSet resultSet = null;
 
 resultSet = searchService.query(
 Repository.getStoreRef(), SearchService.LANGUAGE_LUCENE, query.toString());           
 List<NodeRef> nodes = resultSet.getNodeRefs();
 for (int index=0; index<nodes.size(); index++) {
 
 //Do whatever you want here
 
 }

catch (Throwable err) {
 (…)
}
finally {
         if (resultSet != null)
         {
          resultSet.close();
         }
}