001    /**
002     * Copyright (c) 2000-2012 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 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    }