001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.kernel.cache.cluster;
016    
017    import java.util.List;
018    import java.util.concurrent.atomic.AtomicLong;
019    
020    /**
021     * @author Shuyang Zhou
022     */
023    public class UniformPortalCacheClusterChannelSelector
024            implements PortalCacheClusterChannelSelector {
025    
026            @Override
027            public long getSelectedNumber() {
028                    return _eventCounter.get();
029            }
030    
031            @Override
032            public PortalCacheClusterChannel select(
033                    List<PortalCacheClusterChannel> portalCacheClusterChannels,
034                    PortalCacheClusterEvent portalCacheClusterEvent) {
035    
036                    long count = _eventCounter.getAndIncrement();
037                    int size = portalCacheClusterChannels.size();
038    
039                    return portalCacheClusterChannels.get((int)(count % size));
040            }
041    
042            private AtomicLong _eventCounter = new AtomicLong(0);
043    
044    }