001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 2001-2004 Caucho Technology, Inc. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution, if
019: * any, must include the following acknowlegement:
020: * "This product includes software developed by the
021: * Caucho Technology (http://www.caucho.com/)."
022: * Alternately, this acknowlegement may appear in the software itself,
023: * if and wherever such third-party acknowlegements normally appear.
024: *
025: * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
026: * endorse or promote products derived from this software without prior
027: * written permission. For written permission, please contact
028: * info@caucho.com.
029: *
030: * 5. Products derived from this software may not be called "Resin"
031: * nor may "Resin" appear in their names without prior written
032: * permission of Caucho Technology.
033: *
034: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
035: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
036: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
037: * DISCLAIMED. IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
038: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
039: * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
040: * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
041: * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
042: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
043: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
044: * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
045: *
046: * @author Sam
047: */
048:
049: package com.caucho.portal.generic;
050:
051: import javax.servlet.http.HttpSession;
052: import javax.servlet.http.HttpSessionActivationListener;
053: import javax.servlet.http.HttpSessionBindingEvent;
054: import javax.servlet.http.HttpSessionBindingListener;
055: import javax.servlet.http.HttpSessionEvent;
056: import java.lang.ref.WeakReference;
057: import java.util.LinkedHashMap;
058:
059: public class SessionPreferences extends LinkedHashMap<String, String[]>
060: implements java.io.Serializable, HttpSessionBindingListener,
061: HttpSessionActivationListener {
062: transient WeakReference _sessionRef;
063: transient private boolean _isUpdateNeeded;
064:
065: private String _sessionAttributeName;
066:
067: public SessionPreferences() {
068: }
069:
070: public void valueBound(HttpSessionBindingEvent event) {
071: if (_sessionRef == null) {
072: _sessionRef = new WeakReference(event.getSession());
073: _sessionAttributeName = event.getName();
074: }
075: }
076:
077: public void valueUnbound(HttpSessionBindingEvent event) {
078: _sessionRef = null;
079: _sessionAttributeName = null;
080: }
081:
082: public void sessionDidActivate(HttpSessionEvent event) {
083: _sessionRef = new WeakReference(event.getSession());
084: }
085:
086: public void sessionWillPassivate(HttpSessionEvent event) {
087: }
088:
089: public String[] put(String key, String[] value) {
090: _isUpdateNeeded = true;
091: return super .put(key, value);
092: }
093:
094: void updateSessionIfNeeded() {
095: if (_isUpdateNeeded) {
096: if (_sessionRef != null) {
097: HttpSession session = (HttpSession) _sessionRef.get();
098:
099: if (session != null) {
100: synchronized (session) {
101: session.setAttribute(_sessionAttributeName,
102: this );
103: _isUpdateNeeded = false;
104: }
105: }
106: }
107: }
108: }
109: }
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