| UniformPortalCacheClusterChannelSelector.java |
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 }