SOLR-622: SpellCheckComponent supports auto-loading indices on startup and optionally, (re)builds indices on newSearcher event, if configured in solrconfig.xml

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@681604 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -337,6 +337,10 @@ New Features
               incremental (delta) indexing. See http://wiki.apache.org/solr/DataImportHandler for more details.
               (Noble Paul, shalin)
 
+67. SOLR-622: SpellCheckComponent supports auto-loading indices on startup and optionally, (re)builds indices
+              on newSearcher event, if configured in solrconfig.xml
+              (shalin)              
+    
 Changes in runtime behavior
  1. SOLR-559: use Lucene updateDocument, deleteDocuments methods.  This
    removes the maxBufferedDeletes parameter added by SOLR-310 as Lucene

src/java/org/apache/solr/handler/component/SpellCheckComponent.java

@@ -17,10 +17,24 @@
 
 package org.apache.solr.handler.component;
 
-import org.apache.lucene.analysis.Token;
-import org.apache.lucene.analysis.WhitespaceAnalyzer;
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.xpath.XPathConstants;
+
 import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.analysis.Token;
 import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.WhitespaceAnalyzer;
 import org.apache.lucene.index.IndexReader;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.params.CommonParams;
@@ -30,29 +44,21 @@ import org.apache.solr.common.util.NamedList;
 import org.apache.solr.common.util.SimpleOrderedMap;
 import org.apache.solr.core.SolrConfig;
 import org.apache.solr.core.SolrCore;
+import org.apache.solr.core.SolrEventListener;
 import org.apache.solr.core.SolrResourceLoader;
 import org.apache.solr.schema.FieldType;
 import org.apache.solr.schema.IndexSchema;
+import org.apache.solr.search.SolrIndexSearcher;
+import org.apache.solr.spelling.AbstractLuceneSpellChecker;
 import org.apache.solr.spelling.IndexBasedSpellChecker;
+import org.apache.solr.spelling.QueryConverter;
 import org.apache.solr.spelling.SolrSpellChecker;
 import org.apache.solr.spelling.SpellingResult;
-import org.apache.solr.spelling.QueryConverter;
+import org.apache.solr.util.RefCounted;
 import org.apache.solr.util.plugin.NamedListPluginLoader;
 import org.apache.solr.util.plugin.SolrCoreAware;
 import org.w3c.dom.NodeList;
 
-import javax.xml.xpath.XPathConstants;
-import java.io.IOException;
-import java.io.StringReader;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.ArrayList;
-import java.util.LinkedHashMap;
-import java.util.Iterator;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.logging.Logger;
-
 /**
  * A SearchComponent implementation which provides support for spell checking
  * and suggestions using the Lucene contributed SpellChecker.
@@ -263,6 +269,12 @@ public class SpellCheckComponent extends SearchComponent implements SolrCoreAwar
                 throw new RuntimeException("More than one dictionary is missing name.");
               }
             }
+            // Register event listeners for this SpellChecker
+            core.registerFirstSearcherListener(new SpellCheckerListener(core, checker, true));
+            if (Boolean.parseBoolean((String)spellchecker.get("buildOnCommit")))   {
+              LOG.info("Registering newSearcher listener for spellchecker: " + checker.getDictionaryName());
+              core.registerNewSearcherListener(new SpellCheckerListener(core, checker, false));
+            }
           } else {
             throw new RuntimeException("Can't load spell checker: " + className);
           }
@@ -294,6 +306,47 @@ public class SpellCheckComponent extends SearchComponent implements SolrCoreAwar
     }
   }
 
+  private static class SpellCheckerListener implements SolrEventListener {
+    private final SolrCore core;
+    private final SolrSpellChecker checker;
+    private final boolean firstSearcher;
+
+    public SpellCheckerListener(SolrCore core, SolrSpellChecker checker, boolean firstSearcher) {
+      this.core = core;
+      this.checker = checker;
+      this.firstSearcher = firstSearcher;
+    }
+
+    public void init(NamedList args) {
+    }
+
+    public void newSearcher(SolrIndexSearcher newSearcher,
+                            SolrIndexSearcher currentSearcher) {
+      if (firstSearcher) {
+        try {
+          LOG.info("Loading spell index for spellchecker: "
+                  + checker.getDictionaryName());
+          checker.reload();
+        } catch (IOException e) {
+          LOG.log(Level.SEVERE, "Exception in reloading spell check index for spellchecker: " + checker.getDictionaryName(), e);
+        }
+      } else {
+        // newSearcher event
+        try {
+          LOG.info("Building spell index for spell checker: " + checker.getDictionaryName());
+          checker.build(core, newSearcher);
+        } catch (Exception e) {
+          LOG.log(Level.SEVERE,
+                  "Exception in building spell check index for spellchecker: " + checker.getDictionaryName(), e);
+        }
+      }
+
+    }
+
+    public void postCommit() {
+    }
+  }
+
   // ///////////////////////////////////////////
   // / SolrInfoMBean
   // //////////////////////////////////////////

src/test/org/apache/solr/handler/component/SpellCheckComponentTest.java

@@ -349,6 +349,18 @@ public class SpellCheckComponentTest extends AbstractSolrTestCase {
     }
   }
   
+    @SuppressWarnings("unchecked")
+  public void testRebuildOnCommit() throws Exception {
+    SolrQueryRequest req = req("q", "lowerfilt:lucenejavt", "qt", "spellCheckCompRH", "spellcheck", "true");
+    String response = h.query(req);
+    assertFalse("No suggestions should be returned", response.contains("lucenejava"));
+    
+    assertU(adoc("id", "11231", "lowerfilt", "lucenejava"));
+    assertU("commit", commit());
+    
+    assertQ(req, "//arr[@name='suggestion'][.='lucenejava']");
+  }
+  
   // TODO: add more tests for various spelling options
 
 }

src/test/test-files/solr/conf/solrconfig.xml

@@ -326,6 +326,7 @@
       <str name="name">default</str>
       <str name="field">lowerfilt</str>
       <str name="spellcheckIndexDir">spellchecker1</str>
+      <str name="buildOnCommit">true</str>
     </lst>
     <!-- Example of using different distance measure -->
     <lst name="spellchecker">