SharedSessionAttributeCache.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a copy 5 * of this software and associated documentation files (the "Software"), to deal 6 * in the Software without restriction, including without limitation the rights 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 * copies of the Software, and to permit persons to whom the Software is 9 * furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.portal.servlet; 24 25 import java.io.Serializable; 26 27 import java.util.Map; 28 import java.util.concurrent.ConcurrentHashMap; 29 30 import javax.servlet.http.HttpSession; 31 32 /** 33 * <a href="SharedSessionAttributeCache.java.html"><b><i>View Source</i></b></a> 34 * 35 * @author Michael C. Han 36 * 37 */ 38 public class SharedSessionAttributeCache implements Serializable { 39 40 public static SharedSessionAttributeCache getInstance(HttpSession session) { 41 synchronized (session) { 42 SharedSessionAttributeCache cache = 43 (SharedSessionAttributeCache)session.getAttribute(_SESSION_KEY); 44 45 if (cache == null) { 46 cache = new SharedSessionAttributeCache(); 47 48 session.setAttribute(_SESSION_KEY, cache); 49 } 50 51 return cache; 52 } 53 } 54 55 public boolean contains(String name) { 56 return _attributes.containsKey(name); 57 } 58 59 public Map<String, Object> getValues() { 60 return _attributes; 61 } 62 63 public void removeAttribute(String key) { 64 _attributes.remove(key); 65 } 66 67 public void setAttribute(String key, Object value) { 68 _attributes.put(key, value); 69 } 70 71 private SharedSessionAttributeCache() { 72 _attributes = new ConcurrentHashMap<String, Object>(); 73 } 74 75 private static final String _SESSION_KEY = 76 SharedSessionAttributeCache.class.getName(); 77 78 private Map<String, Object> _attributes; 79 80 }