001    /**
002     * Copyright (c) 2000-2012 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.kernel.cache.cluster;
016    
017    import com.liferay.portal.kernel.util.Validator;
018    
019    import java.util.Comparator;
020    
021    /**
022     * @author Shuyang Zhou
023     */
024    public class PortalCacheClusterEventCoalesceComparator
025            implements Comparator<PortalCacheClusterEvent> {
026    
027            public int compare(
028                    PortalCacheClusterEvent portalCacheClusterEvent1,
029                    PortalCacheClusterEvent portalCacheClusterEvent2) {
030    
031                    if ((portalCacheClusterEvent1 == null) ||
032                            (portalCacheClusterEvent2 == null)) {
033    
034                            return 1;
035                    }
036    
037                    if (Validator.equals(
038                                    portalCacheClusterEvent1.getCacheName(),
039                                    portalCacheClusterEvent2.getCacheName()) &&
040                            Validator.equals(
041                                    portalCacheClusterEvent1.getElementKey(),
042                                    portalCacheClusterEvent2.getElementKey()) &&
043                            (portalCacheClusterEvent1.getEventType() ==
044                                    portalCacheClusterEvent2.getEventType())) {
045    
046                            portalCacheClusterEvent1.setElementValue(
047                                    portalCacheClusterEvent2.getElementValue());
048    
049                            return 0;
050                    }
051    
052                    return -1;
053            }
054    
055    }