Moving to root below branch label

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2005 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/search/transaction/LuceneIndexLock.java

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+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the
+ * License.
+ */
+package org.alfresco.repo.search.transaction;
+
+import java.util.HashMap;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.alfresco.service.cmr.repository.StoreRef;
+
+public class LuceneIndexLock 
+{
+    private HashMap<StoreRef, ReentrantLock> locks = new HashMap<StoreRef, ReentrantLock> ();
+
+    public LuceneIndexLock()
+    {
+        super();
+    }
+    
+    public void getReadLock(StoreRef ref)
+    {
+      return;
+    }
+    
+    public void releaseReadLock(StoreRef ref)
+    {
+      return;
+    }
+    
+    public void getWriteLock(StoreRef ref)
+    {
+        ReentrantLock lock;
+        synchronized(locks)
+        {
+            lock = locks.get(ref);
+            if(lock == null)
+            {
+                lock = new ReentrantLock(true);
+                locks.put(ref, lock);
+            }
+        }
+        lock.lock();
+    }
+    
+    public void releaseWriteLock(StoreRef ref)
+    {
+        ReentrantLock lock;
+        synchronized(locks)
+        {
+            lock = locks.get(ref); 
+        }
+        if(lock != null)
+        {
+           lock.unlock();
+        }
+      
+    }
+}