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/**
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* '$RCSfile$'
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* Purpose: A Class that implements session utility methods
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* Copyright: 2008 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Michael Daigle
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.service;
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import java.util.Hashtable;
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import org.apache.log4j.Logger;
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import edu.ucsb.nceas.metacat.util.SessionData;
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public class SessionService extends BaseService {
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private static SessionService sessionService = null;
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private static Logger logMetacat = Logger.getLogger(SessionService.class);
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private static Hashtable<String, SessionData> sessionHash = null;
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private static final String PUBLIC_SESSION_ID = "0";
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/**
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* private constructor since this is a singleton
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*/
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private SessionService() throws ServiceException {
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sessionHash = new Hashtable<String, SessionData>();
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logMetacat.debug("Registering public session id: " + PUBLIC_SESSION_ID);
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registerSession(PUBLIC_SESSION_ID, "public", null, null);
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}
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/**
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* Get the single instance of SessionService.
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*
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* @return the single instance of SessionService
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*/
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public static SessionService getInstance() throws ServiceException {
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if (sessionService == null) {
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sessionService = new SessionService();
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}
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return sessionService;
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}
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public boolean refreshable() {
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return false;
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}
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public void doRefresh() throws ServiceException {
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return;
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}
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public void stop() throws ServiceException {
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return;
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}
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/**
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* Register a session in the session hash table. This uses
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* the parameters passed in to create a SessionData object.
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*
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* @param sessionId
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* the ID of the session to register
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* @param userName
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* the user name of the session
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* @param groupNames
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* the group names for the session
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* @param password
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* the password for the session
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*/
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public static void registerSession(String sessionId, String userName,
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String[] groupNames, String password) throws ServiceException {
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if (sessionId == null) {
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throw new ServiceException("Cannot register a null session id");
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}
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logMetacat.debug("Registering session id: " + sessionId);
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SessionData sessionData = new SessionData(sessionId, userName, groupNames,
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password);
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sessionHash.put(sessionId, sessionData);
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}
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/**
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* Register a session in the session hash table.
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*
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* @param sessionData
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* the session data object to add to the session hash
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*/
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public static void registerSession(SessionData sessionData) throws ServiceException {
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if (sessionData == null) {
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throw new ServiceException("Cannot register null session data");
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}
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logMetacat.debug("Registering session date with id: " + sessionData.getId());
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sessionHash.put(sessionData.getId(), sessionData);
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}
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/**
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* Unregister a session from the session hash table.
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*
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* @param sessionId
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* the id of the session to remove.
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*/
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public static void unRegisterSession(String sessionId) {
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if (sessionId != null) {
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logMetacat.error("trying to unregister a session with null id");
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sessionHash.remove(sessionId);
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}
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}
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/**
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* Check if a session is registered in the session hash table.
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* TODO MCD need to time sessions out
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*
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* @param sessionId
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* the id of the session to look for.
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*/
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public static boolean isSessionRegistered(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("trying to check if a session with null id is registered");
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return false;
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}
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return sessionHash.containsKey(sessionId);
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}
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/**
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* Get a registered session from the session hash table.
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* TODO MCD need to time sessions out
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*
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* @param sessionId
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* the id of the session to retrieve.
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*/
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public static SessionData getRegisteredSession(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("trying to get a session with null id");
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return null;
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}
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return sessionHash.get(sessionId);
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}
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/**
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* Get the public session from the session hash table.
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*/
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public static SessionData getPublicSession() {
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return sessionHash.get(PUBLIC_SESSION_ID);
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}
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/**
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* Keep a session active by updating its last accessed time.
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*
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* @param sessionId
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* the id of the session to update.
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*/
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public static synchronized void touchSession(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("trying to touch a session with null id");
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} else if (isSessionRegistered(sessionId)) {
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SessionData sessionData = getRegisteredSession(sessionId);
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sessionData.setLastAccessedTime();
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}
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}
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}
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