Part 2 of ALF-9413 RSOLR 022: Fine-grained control of full-text indexing

- big switch to turn off content indexing is working for lucene sub-system - catches up (eventually) via FTS as expected
- includes further improvements to subsystem shutdown which also relates to: ALF-9079 RSOLR 019: Lucene to SOLR switchover administration
- lucene indexes can be deleted after subsystem shutdown
- at subsystem  star the  index rebuilds if required and restarts FTS on load
- subsystem shutdown requires more work if two lucene subsytems are ever to exist together
   - does not shutdown existing IndexInfo work nicely -> possible exceptions as IndexInfo resources are cremoved and cleaned up from those expecting them to be there ... may regrab resourcse

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@29097 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/search/impl/lucene/index/IndexInfo.java

@@ -139,23 +139,36 @@ import com.werken.saxpath.XPathReader;
  */
 public class IndexInfo implements IndexMonitor
 {
-    public static void destroy()
+    public static synchronized void destroy()
     {
         timer.cancel();
         timer = new Timer(true);
         for(IndexInfo indexInfo : indexInfos.values())
         {
+           indexInfo.destroyInstance();
+        }
+        indexInfos.clear();
+        ReferenceCountingReadOnlyIndexReaderFactory.destroy();
+    }
+    
+    public void destroyInstance()
+    {
+        getWriteLock();
         try
         {
-                ((ReferenceCounting) indexInfo.mainIndexReader).setInvalidForReuse();
+            if(mainIndexReader != null)
+            {
+                try
+                {
+                    ((ReferenceCounting) mainIndexReader).setInvalidForReuse();
                 }
                 catch (IOException e)
                 {
                     // OK filed to close
                 }
-            indexInfo.mainIndexReader = null;
+                mainIndexReader = null;
 
-            for(IndexReader reader : indexInfo.referenceCountingReadOnlyIndexReaders.values())
+                for(IndexReader reader : referenceCountingReadOnlyIndexReaders.values())
                 {
                     ReferenceCounting referenceCounting = (ReferenceCounting) reader;
                     try
@@ -168,8 +181,9 @@ public class IndexInfo implements IndexMonitor
                         e.printStackTrace();
                     }
                 }
+            }
 
-            for(IndexReader reader : indexInfo.indexReaders.values())
+            for(IndexReader reader : indexReaders.values())
             {
                 try
                 {
@@ -181,8 +195,9 @@ public class IndexInfo implements IndexMonitor
                     e.printStackTrace();
                 }
             }
+            indexReaders.clear();
 
-            for(IndexWriter writer : indexInfo.indexWriters.values())
+            for(IndexWriter writer : indexWriters.values())
             {
                 try
                 {
@@ -199,9 +214,41 @@ public class IndexInfo implements IndexMonitor
                     e.printStackTrace();
                 }
             }
+            indexWriters.clear();
+            
+            if(indexInfoRAF != null)
+            {
+                try
+                {
+                    indexInfoRAF.close();
+                }
+                catch (IOException e)
+                {
+                    // TODO Auto-generated catch block
+                    e.printStackTrace();
+                }
+            }
+            
+            if(indexInfoBackupRAF != null)
+            {
+                try
+                {
+                    indexInfoBackupRAF.close();
+                }
+                catch (IOException e)
+                {
+                    // TODO Auto-generated catch block
+                    e.printStackTrace();
+                }
+            }
+            
+            // TODO: should set some running flag .... to abort ungoing stuff
+            // at the moment it will die ungracefully ....
+        }
+        finally
+        {
+            releaseWriteLock();
         }
-        indexInfos.clear();
-        ReferenceCountingReadOnlyIndexReaderFactory.destroy();
     }
     
     public static final String MAIN_READER = "MainReader";