001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.servlet;
016    
017    import com.liferay.portal.kernel.util.AutoResetThreadLocal;
018    import com.liferay.portal.kernel.util.WebKeys;
019    
020    import java.io.Closeable;
021    
022    import java.util.ArrayList;
023    import java.util.Collections;
024    import java.util.Enumeration;
025    import java.util.List;
026    import java.util.Locale;
027    import java.util.concurrent.locks.Lock;
028    
029    import javax.servlet.RequestDispatcher;
030    import javax.servlet.ServletRequest;
031    import javax.servlet.ServletRequestWrapper;
032    
033    /**
034     * @author Shuyang Zhou
035     */
036    public class ThreadLocalFacadeServletRequestWrapper
037            extends ServletRequestWrapper implements Closeable {
038    
039            public ThreadLocalFacadeServletRequestWrapper(
040                    ServletRequestWrapper servletRequestWrapper,
041                    ServletRequest nextServletRequest) {
042    
043                    super(nextServletRequest);
044    
045                    _servletRequestWrapper = servletRequestWrapper;
046    
047                    _nextServletRequestThreadLocal.set(nextServletRequest);
048    
049                    _locales = new ArrayList<Locale>();
050    
051                    Enumeration<Locale> enumeration = nextServletRequest.getLocales();
052    
053                    while (enumeration.hasMoreElements()) {
054                            _locales.add(enumeration.nextElement());
055                    }
056            }
057    
058            @Override
059            public void close() {
060                    if (_servletRequestWrapper != null) {
061                            ServletRequest nextServletRequest =
062                                    _nextServletRequestThreadLocal.get();
063    
064                            _servletRequestWrapper.setRequest(nextServletRequest);
065                    }
066            }
067    
068            @Override
069            public Object getAttribute(String name) {
070                    ServletRequest servletRequest = getRequest();
071    
072                    return servletRequest.getAttribute(name);
073            }
074    
075            @Override
076            public Enumeration<String> getAttributeNames() {
077                    ServletRequest servletRequest = getRequest();
078    
079                    Lock lock = (Lock)servletRequest.getAttribute(
080                            WebKeys.PARALLEL_RENDERING_MERGE_LOCK);
081    
082                    if (lock != null) {
083                            lock.lock();
084                    }
085    
086                    try {
087                            return servletRequest.getAttributeNames();
088                    }
089                    finally {
090                            if (lock != null) {
091                                    lock.unlock();
092                            }
093                    }
094            }
095    
096            @Override
097            public Enumeration<Locale> getLocales() {
098                    return Collections.enumeration(_locales);
099            }
100    
101            @Override
102            public ServletRequest getRequest() {
103                    return _nextServletRequestThreadLocal.get();
104            }
105    
106            @Override
107            public RequestDispatcher getRequestDispatcher(String uri) {
108                    ServletRequest servletRequest = getRequest();
109    
110                    return servletRequest.getRequestDispatcher(uri);
111            }
112    
113            @Override
114            public void removeAttribute(String name) {
115                    ServletRequest servletRequest = getRequest();
116    
117                    servletRequest.removeAttribute(name);
118            }
119    
120            @Override
121            public void setAttribute(String name, Object o) {
122                    ServletRequest servletRequest = getRequest();
123    
124                    servletRequest.setAttribute(name, o);
125            }
126    
127            @Override
128            public void setRequest(ServletRequest servletRequest) {
129                    _nextServletRequestThreadLocal.set(servletRequest);
130            }
131    
132            private static ThreadLocal<ServletRequest> _nextServletRequestThreadLocal =
133                    new AutoResetThreadLocal<ServletRequest>(
134                            ThreadLocalFacadeServletRequestWrapper.class +
135                                    "._nextServletRequestThreadLocal") {
136    
137                            @Override
138                            protected ServletRequest copy(ServletRequest servletRequest) {
139                                    return servletRequest;
140                            }
141    
142                    };
143    
144            private List<Locale> _locales;
145            private ServletRequestWrapper _servletRequestWrapper;
146    
147    }