/********************************************************************************
* *
* (c) Copyright 2010 Verizon Communications USA and The Open University UK *
* *
* This software is freely distributed in accordance with *
* the GNU Lesser General Public (LGPL) license, version 3 or later *
* as published by the Free Software Foundation. *
* For details see LGPL: http://www.fsf.org/licensing/licenses/lgpl.html *
* and GPL: http://www.fsf.org/licensing/licenses/gpl-3.0.html *
* *
* This software is provided by the copyright holders and contributors "as is" *
* and any express or implied warranties, including, but not limited to, the *
* implied warranties of merchantability and fitness for a particular purpose *
* are disclaimed. In no event shall the copyright owner or contributors be *
* liable for any direct, indirect, incidental, special, exemplary, or *
* consequential damages (including, but not limited to, procurement of *
* substitute goods or services; loss of use, data, or profits; or business *
* interruption) however caused and on any theory of liability, whether in *
* contract, strict liability, or tort (including negligence or otherwise) *
* arising in any way out of the use of this software, even if advised of the *
* possibility of such damage. *
* *
********************************************************************************/
package com.compendium.core.datamodel.services;
import java.util.Hashtable;
import java.util.Vector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This object store a particular set of users against their sessions
*
* @author Michelle Bachler
*/
public class UserSessionCache {
/**
* class's own logger
*/
final Logger log = LoggerFactory.getLogger(getClass());
/** Holds the User ids against a Vector of their session ids */
private Hashtable htUserSessions = null;
/** Constructor */
public UserSessionCache() {
htUserSessions = new Hashtable(51);
}
/**
* Adds a service to the cache against the given user id.
*
* @param String sUserID, the user id of the user to add the session against.
* @param String sSession, the id of the sesion to add.
*/
public void put(String sUserID, String sessionID) {
Vector vtSessions = null;
if (htUserSessions.containsKey(sUserID)) {
vtSessions = (Vector)htUserSessions.get(sUserID);
vtSessions.addElement(sessionID);
}
else {
vtSessions = new Vector(10);
vtSessions.addElement(sessionID);
htUserSessions.put(sUserID, vtSessions);
}
}
/**
* Remove the given session from the user session cache.
*
* @param String sUserID, the user id of the user whose session to remove from the cache.
* @param String sSession, the id of the sesion to remove.
*/
public void remove(String sUserID, String sSessionID) {
if (htUserSessions.containsKey(sUserID)) {
Vector vtSessions = (Vector)htUserSessions.get(sUserID);
int nCount = vtSessions.size();
for (int i=0; i<nCount; i++) {
String sID = (String)vtSessions.elementAt(i);
if (sID.equals(sSessionID))
vtSessions.remove(sID);
}
}
}
/**
* Empty the hashtable data to aid garbage collection
*/
public void cleanUp() {
htUserSessions.clear();
htUserSessions = null;
}
}