001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.cache.cluster.clusterlink;
016    
017    import com.liferay.portal.kernel.cache.cluster.PortalCacheClusterChannel;
018    import com.liferay.portal.kernel.cache.cluster.PortalCacheClusterChannelFactory;
019    import com.liferay.portal.kernel.cache.cluster.PortalCacheClusterException;
020    import com.liferay.portal.kernel.cluster.Priority;
021    
022    import java.util.Collections;
023    import java.util.List;
024    import java.util.concurrent.atomic.AtomicInteger;
025    
026    /**
027     * @author Shuyang Zhou
028     */
029    public class ClusterLinkPortalCacheClusterChannelFactory
030            implements PortalCacheClusterChannelFactory {
031    
032            public ClusterLinkPortalCacheClusterChannelFactory(
033                    String destination, List<Priority> priorities) {
034    
035                    _counter = new AtomicInteger(0);
036                    _destination = destination;
037                    _priorities = priorities;
038    
039                    Collections.sort(priorities);
040            }
041    
042            public PortalCacheClusterChannel createPortalCacheClusterChannel()
043                    throws PortalCacheClusterException {
044    
045                    int count = _counter.getAndIncrement();
046    
047                    if (count >= _priorities.size()) {
048                            throw new IllegalStateException(
049                                    "Cannot create more than " + _priorities.size() + " channels");
050                    }
051    
052                    return new ClusterLinkPortalCacheClusterChannel(
053                            _destination, _priorities.get(count));
054            }
055    
056            private AtomicInteger _counter;
057            private String _destination;
058            private List<Priority> _priorities;
059    
060    }