LuceneIndexLock


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.repo.search.transaction;
18  
19  import java.util.HashMap  ;
20  import java.util.concurrent.locks.ReentrantLock  ;
21  
22  import org.alfresco.service.cmr.repository.StoreRef;
23  
24  public class LuceneIndexLock 
25  {
26      private HashMap  <StoreRef, ReentrantLock  > locks = new HashMap  <StoreRef, ReentrantLock  > ();
27  
28      public LuceneIndexLock()
29      {
30          super();
31      }
32      
33      public void getReadLock(StoreRef ref)
34      {
35        return;
36      }
37      
38      public void releaseReadLock(StoreRef ref)
39      {
40        return;
41      }
42      
43      public void getWriteLock(StoreRef ref)
44      {
45          ReentrantLock   lock;
46          synchronized(locks)
47          {
48              lock = locks.get(ref);
49              if(lock == null)
50              {
51                  lock = new ReentrantLock  (true);
52                  locks.put(ref, lock);
53              }
54          }
55          lock.lock();
56      }
57      
58      public void releaseWriteLock(StoreRef ref)
59      {
60          ReentrantLock   lock;
61          synchronized(locks)
62          {
63              lock = locks.get(ref); 
64          }
65          if(lock != null)
66          {
67             lock.unlock();
68          }
69        
70      }
71  }
72
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