1 /**
2 * This file Copyright (c) 2003-2014 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.module.cache.cachepolicy.voters;
35
36 import info.magnolia.module.cache.filter.CacheResponseWrapper;
37 import info.magnolia.voting.Voter;
38 import info.magnolia.voting.Voting;
39
40 import org.slf4j.Logger;
41 import org.slf4j.LoggerFactory;
42
43
44 /**
45 * The lowest TTL wins.
46 */
47 public class TtlVoting implements Voting<CacheResponseWrapper> {
48
49 Logger log = LoggerFactory.getLogger(TtlVoting.class);
50
51 @Override
52 public int vote(Voter<CacheResponseWrapper>[] voters, CacheResponseWrapper value) {
53 int lowestVote = Integer.MAX_VALUE;
54 for (int i = 0; i < voters.length; i++) {
55 Voter voter = voters[i];
56 if (voter.isEnabled()) {
57 int vote = voter.vote(value);
58 log.debug("voter [{}] fired {}", voter, vote);
59
60 if (vote < lowestVote) {
61 lowestVote = vote;
62 log.debug("lowestVote vote is now {}", Integer.toString(lowestVote));
63 if (lowestVote == 0) { //the lowest possible value
64 return 0;
65 }
66 }
67 }
68 }
69 return lowestVote == Integer.MAX_VALUE ? -1 : lowestVote; // -1 was always used for 'cache forever' so keep it compatible
70 }
71 }