1 /**
2 * This file Copyright (c) 2010-2011 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.blossom.web;
35
36 import java.io.IOException;
37 import javax.servlet.FilterChain;
38 import javax.servlet.ServletException;
39 import javax.servlet.ServletRequest;
40 import javax.servlet.ServletResponse;
41
42 import org.springframework.web.filter.DelegatingFilterProxy;
43
44 /**
45 * Extension of {@link DelegatingFilterProxy} needed when Spring hasn't started and the filter is seeing requests. This
46 * happens when Magnolia is in install/update mode. Until the update/install -phase is over it will simply delegate
47 * to the next filter in line.
48 *
49 * @see DelegatingFilterProxy
50 * @since 1.2
51 */
52 public class InstallationAwareDelegatingFilterProxy extends DelegatingFilterProxy {
53
54 private boolean initialized = false;
55 private final Object monitor = new Object();
56
57 @Override
58 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
59 if (isInitialized()) {
60 super.doFilter(request, response, chain);
61 } else {
62 chain.doFilter(request, response);
63 }
64 }
65
66 private boolean isInitialized() {
67 synchronized (monitor) {
68 return initialized || (initialized = canInitialize());
69 }
70 }
71
72 protected boolean canInitialize() {
73 // There's no way to test if all modules have started but we can test to make sure that the root web application has been initialized.
74 return findWebApplicationContext() != null;
75 }
76 }