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 java.util.Random; 022 023import lucee.commons.collection.concurrent.ConcurrentLinkedHashMapPro.Entry; 024 025public class RandomPolicy implements EvictionPolicy { 026 027 Random random = new Random(); 028 029 @Override 030 public boolean accessOrder() { 031 return false; 032 } 033 034 @Override 035 public boolean insertionOrder() { 036 return false; 037 } 038 039 @Override 040 public Entry<?, ?> evictElement(Entry<?, ?> head) { 041 int hops = random.nextInt(); 042 Entry<?,?> entryToEvict = head.getAfter(); 043 for(int i = 0; i < hops; i++) 044 entryToEvict = entryToEvict.getAfter(); 045 return entryToEvict; 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 return null; 056 } 057 058}