001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.commons.collection.concurrent;
020
021import lucee.commons.collection.concurrent.ConcurrentLinkedHashMapPro.Entry;
022
023public class ExpirationPolicy implements EvictionPolicy {
024        
025        long ageThresholdMillis;
026        long idleTimeThresholdMillis;
027        
028        public ExpirationPolicy(long ageThresholdMillis, long idleTimeThresholdMillis) {
029                this.ageThresholdMillis = ageThresholdMillis;
030                this.idleTimeThresholdMillis = idleTimeThresholdMillis;
031        }
032
033        @Override
034        public boolean accessOrder() {
035                return true;
036        }
037        
038        @Override
039        public boolean insertionOrder() {
040                return false;
041        }
042        
043        @Override
044        public Entry<?, ?> evictElement(Entry<?, ?> head) {
045                return head.getAfter();
046        }
047
048        @Override
049        public Entry<?, ?> recordInsertion(Entry<?, ?> head, Entry<?, ?> insertedEntry) {
050                return null;
051        }
052
053        @Override
054        public Entry<?, ?> recordAccess(Entry<?, ?> head, Entry<?, ?> accessedEntry) {
055                long now = System.currentTimeMillis();
056                long accessedEntryAge = (now - accessedEntry.getCreationTime());
057                long accessedEntryIdleTime = (now - accessedEntry.getLastAccessTime());
058                if(accessedEntryIdleTime < idleTimeThresholdMillis && accessedEntryAge < ageThresholdMillis)
059                        return head;
060                return accessedEntry.getAfter();
061        }
062
063}