1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.cache.cluster;
16  
17  import java.util.List;
18  import java.util.concurrent.atomic.AtomicLong;
19  
20  /**
21   * <a href="UniformPortalCacheClusterChannelSelector.java.html"><b><i>View
22   * Source</i></b></a>
23   *
24   * @author Shuyang Zhou
25   */
26  public class UniformPortalCacheClusterChannelSelector
27      implements PortalCacheClusterChannelSelector {
28  
29      public long getSelectedNumber() {
30          return _eventCounter.get();
31      }
32  
33      public PortalCacheClusterChannel select(
34          List<PortalCacheClusterChannel> portalCacheClusterChannels,
35          PortalCacheClusterEvent portalCacheClusterEvent) {
36  
37          long count = _eventCounter.getAndIncrement();
38          int size = portalCacheClusterChannels.size();
39  
40          return portalCacheClusterChannels.get((int)(count % size));
41      }
42  
43      private AtomicLong _eventCounter = new AtomicLong(0);
44  
45  }