1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
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  }