LockManager


1   /*******************************************************************************
2    * Copyright (c) 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.update.internal.core;
12  
13  import java.util.Hashtable  ;
14  
15  /**
16   * @author aniefer
17   *
18   */
19  public class LockManager {
20      // lock
21      private final static Object   lock = new Object  ();
22  
23      // hashtable of locks
24      private static Hashtable   locks = new Hashtable  ();
25      
26      public static Object   getLock(String   key) {
27          synchronized (lock) {
28              if (locks.get(key) == null)
29                  locks.put(key, key);
30              return locks.get(key);
31          }
32      }
33      
34      public static void returnLock(String   key) {
35          synchronized (lock) {
36              locks.remove(key);
37          }
38      }
39  }
40

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