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Java > Open Source Codes > org > apache > cocoon > portal > event > aspect > impl > NoClientCachingEventAspect


1 /*
2  * Copyright 1999-2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.cocoon.portal.event.aspect.impl;
17
18 import org.apache.avalon.framework.logger.AbstractLogEnabled;
19 import org.apache.avalon.framework.thread.ThreadSafe;
20 import org.apache.cocoon.environment.ObjectModelHelper;
21 import org.apache.cocoon.environment.Response;
22 import org.apache.cocoon.portal.PortalService;
23 import org.apache.cocoon.portal.event.aspect.EventAspect;
24 import org.apache.cocoon.portal.event.aspect.EventAspectContext;
25
26 /**
27  * This aspect implementation sets some headers on the response that tell
28  * clients/proxies to not cache. This "disables" the back button on the
29  * client.
30  *
31  * @author <a HREF="mailto:cziegeler@s-und-n.de">Carsten Ziegeler</a>
32  *
33  * @version CVS $Id: NoClientCachingEventAspect.java 219049 2005-07-14 15:11:52Z cziegeler $
34  */
35 public class NoClientCachingEventAspect
36     extends AbstractLogEnabled
37     implements EventAspect,
38                ThreadSafe {
39
40     /**
41      * @see org.apache.cocoon.portal.event.aspect.EventAspect#process(org.apache.cocoon.portal.event.aspect.EventAspectContext, org.apache.cocoon.portal.PortalService)
42      */
43     public void process(EventAspectContext context, PortalService service) {
44
45         final Response response = ObjectModelHelper.getResponse( context.getObjectModel() );
46         response.setHeader("Cache-Control", "no-cache");
47         response.addHeader("Cache-Control", "no-store");
48         response.setHeader("Pragma", "no-cache");
49         response.setHeader("Expires", "Thu, 01 Jan 2000 00:00:00 GMT");
50
51         context.invokeNext(service);
52     }
53 }
54
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