/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2010 The eXist Project
 *  http://exist-db.org
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */
package org.exist.http;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import java.util.concurrent.atomic.AtomicLong;

public class SessionCountListener implements HttpSessionListener {

    private static AtomicLong activeSessions = new AtomicLong();

    @Override
    public void sessionCreated(HttpSessionEvent httpSessionEvent) {
        activeSessions.incrementAndGet();
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
        activeSessions.decrementAndGet();
    }

    public static long getActiveSessions() {
        return activeSessions.get();
    }
}