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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acegisecurity.concurrent;

import org.acegisecurity.ui.session.HttpSessionDestroyedEvent;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;

import org.springframework.util.Assert;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpSession;


/**
 * Base implementation of {@link org.acegisecurity.concurrent.SessionRegistry}
 * which also listens for {@link
 * org.acegisecurity.ui.session.HttpSessionDestroyedEvent}s published in the
 * Spring application context.
 * 
 * 

* NB: It is important that you register the {@link * org.acegisecurity.ui.session.HttpSessionEventPublisher} in * web.xml so that this class is notified of sessions that * expire. *

* * @author Ben Alex * @version $Id: SessionRegistryImpl.java 1418 2006-04-27 23:25:00Z benalex ${date} */ public class SessionRegistryImpl implements SessionRegistry, ApplicationListener { //~ Instance fields ======================================================== private Map principals = Collections.synchronizedMap(new HashMap()); // private Map sessionIds = Collections.synchronizedMap(new HashMap()); // //~ Methods ================================================================ public Object[] getAllPrincipals() { return principals.keySet().toArray(); } public SessionInformation[] getAllSessions(Object principal, boolean includeExpiredSessions) { Set sessionsUsedByPrincipal = (Set) principals.get(principal); if (sessionsUsedByPrincipal == null) { return null; } List list = new ArrayList(); Iterator iter = sessionsUsedByPrincipal.iterator(); while (iter.hasNext()) { synchronized (sessionsUsedByPrincipal) { String sessionId = (String) iter.next(); SessionInformation sessionInformation = getSessionInformation(sessionId); if (includeExpiredSessions || !sessionInformation.isExpired()) { list.add(sessionInformation); } } } return (SessionInformation[]) list.toArray(new SessionInformation[] {}); } public SessionInformation getSessionInformation(String sessionId) { Assert.hasText(sessionId, "SessionId required as per interface contract"); return (SessionInformation) sessionIds.get(sessionId); } public void onApplicationEvent(ApplicationEvent event) { if (event instanceof HttpSessionDestroyedEvent) { String sessionId = ((HttpSession) event.getSource()).getId(); removeSessionInformation(sessionId); } } public void refreshLastRequest(String sessionId) { Assert.hasText(sessionId, "SessionId required as per interface contract"); SessionInformation info = getSessionInformation(sessionId); if (info != null) { info.refreshLastRequest(); } } public void registerNewSession(String sessionId, Object principal) throws SessionAlreadyUsedException { Assert.hasText(sessionId, "SessionId required as per interface contract"); Assert.notNull(principal, "Principal required as per interface contract"); if (getSessionInformation(sessionId) != null) { throw new SessionAlreadyUsedException("Session " + sessionId + " is already is use"); } sessionIds.put(sessionId, new SessionInformation(principal, sessionId, new Date())); Set sessionsUsedByPrincipal = (Set) principals.get(principal); if (sessionsUsedByPrincipal == null) { sessionsUsedByPrincipal = Collections.synchronizedSet(new HashSet()); } sessionsUsedByPrincipal.add(sessionId); principals.put(principal, sessionsUsedByPrincipal); } public void removeSessionInformation(String sessionId) { Assert.hasText(sessionId, "SessionId required as per interface contract"); SessionInformation info = getSessionInformation(sessionId); if (info != null) { sessionIds.remove(sessionId); Set sessionsUsedByPrincipal = (Set) principals.get(info.getPrincipal()); if (sessionsUsedByPrincipal != null) { synchronized (sessionsUsedByPrincipal) { sessionsUsedByPrincipal.remove(sessionId); if (sessionsUsedByPrincipal.size() == 0) { // No need to keep object in principals Map anymore principals.remove(info.getPrincipal()); } } } } } }




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