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Java file server with SMB, FTP/FTPS and NFS support, virtual filesystems, database filesystems
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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco 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 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Alfresco. If not, see .
 */

package org.filesys.server;

import java.util.Collections;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.LinkedList;

/**
 * Server Session List Class
 *
 * @author gkspencer
 */
public class SrvSessionList {

    //	Session list
    private Hashtable m_sessions;

    /**
     * Class constructor
     */
    public SrvSessionList() {
        m_sessions = new Hashtable();
    }

    /**
     * Return the number of sessions in the list
     *
     * @return int
     */
    public final int numberOfSessions() {
        return m_sessions.size();
    }

    /**
     * Add a session to the list
     *
     * @param sess SrvSession
     */
    public final void addSession(SrvSession sess) {
        synchronized ( m_sessions) {
            m_sessions.put(sess.getSessionId(), sess);
        }
    }

    /**
     * Find the session using the unique session id
     *
     * @param id int
     * @return SrvSession
     */
    public final SrvSession findSession(int id) {
        return m_sessions.get(id);
    }

    /**
     * Remove a session from the list
     *
     * @param sess SrvSession
     * @return SrvSession
     */
    public final SrvSession removeSession(SrvSession sess) {
        return removeSession(sess.getSessionId());
    }

    /**
     * Remove a session from the list
     *
     * @param id Integer
     * @return SrvSession
     */
    public final SrvSession removeSession(int id) {

        //	Remove the session and return the removed session
        synchronized ( m_sessions) {
            return m_sessions.remove(id);
        }
    }

    /**
     * Enumerate the session objects
     *
     * @return Enumeration of server sessions
     */
    public final Enumeration enumerateSessions() {

        // An atomic operation
        synchronized (m_sessions) {
            return Collections.enumeration(new LinkedList(m_sessions.values()));
        }
    }
}