1 /**
2 * This file Copyright (c) 2008-2011 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.executor;
35
36 import javax.servlet.http.HttpServletRequest;
37
38 import info.magnolia.module.cache.CacheConfiguration;
39 import info.magnolia.module.cache.CachePolicyExecutor;
40
41 /**
42 * The cache configuration is passed to the executor.
43 *
44 * @author pbracher
45 * @version $Revision: 41137 $ ($Author: gjoseph $)
46 */
47 public abstract class AbstractExecutor implements CachePolicyExecutor {
48
49 private CacheConfiguration cacheConfiguration;
50
51 public CacheConfiguration getCacheConfiguration() {
52 return cacheConfiguration;
53 }
54
55 public void setCacheConfiguration(CacheConfiguration cacheConfiguration) {
56 this.cacheConfiguration = cacheConfiguration;
57 }
58
59 /**
60 * Checks if server cache is newer than the client cache.
61 * @param request The servlet request we are processing
62 * @return boolean true if the server resource is newer
63 */
64 protected boolean ifModifiedSince(HttpServletRequest request, long cacheStorageTimestamp) {
65 try {
66 long headerValue = request.getDateHeader("If-Modified-Since");
67 if (headerValue != -1) {
68 // If an If-None-Match header has been specified, If-Modified-Since is ignored.
69 // The header defines only seconds, so we ignore the milliseconds.
70 final long cacheStorageTimestampSeconds = cacheStorageTimestamp - (cacheStorageTimestamp % 1000);
71 if (request.getHeader("If-None-Match") == null && cacheStorageTimestamp > 0 && (cacheStorageTimestampSeconds <= headerValue)) {
72 return false;
73 }
74 }
75 } catch (IllegalArgumentException e) {
76 // can happen per spec if the header value can't be converted to a date ...
77 return true;
78 }
79 return true;
80 }
81
82
83 }