1 /**
2 * This file Copyright (c) 2008-2018 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 info.magnolia.module.cache.CachePolicyExecutor;
37 import info.magnolia.module.cache.ContentCachingConfiguration;
38
39 import javax.servlet.http.HttpServletRequest;
40
41 /**
42 * The cache configuration is passed to the executor.
43 *
44 * @author pbracher
45 * @version $Revision$ ($Author$)
46 */
47 public abstract class AbstractExecutor implements CachePolicyExecutor {
48
49 private ContentCachingConfiguration contentCachingConfiguration;
50
51 public ContentCachingConfiguration getContentCachingConfiguration() {
52 return contentCachingConfiguration;
53 }
54
55 @Override
56 public void setContentCachingConfiguration(ContentCachingConfiguration contentCachingConfiguration) {
57 this.contentCachingConfiguration = contentCachingConfiguration;
58 }
59
60 /**
61 * Checks if server cache is newer than the client cache.
62 * @param request The servlet request we are processing
63 * @return boolean true if the server resource is newer
64 */
65 protected boolean ifModifiedSince(HttpServletRequest request, long cacheStorageTimestamp) {
66 try {
67 long headerValue = request.getDateHeader("If-Modified-Since");
68 if (headerValue != -1) {
69 // If an If-None-Match header has been specified, If-Modified-Since is ignored.
70 // The header defines only seconds, so we ignore the milliseconds.
71 final long cacheStorageTimestampSeconds = cacheStorageTimestamp - (cacheStorageTimestamp % 1000);
72 if (request.getHeader("If-None-Match") == null && cacheStorageTimestamp > 0 && (cacheStorageTimestampSeconds <= headerValue)) {
73 return false;
74 }
75 }
76 } catch (IllegalArgumentException e) {
77 // can happen per spec if the header value can't be converted to a date ...
78 return true;
79 }
80 return true;
81 }
82
83
84 }