/*
 * Copyright (C) 2003-2004 Red Hat Inc. All Rights Reserved.
 *
 * This library 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
package com.arsdigita.search.lucene;

/**
 *
 * LuceneLock is intended to be a lock/mutex to control access to the
 * Lucene index resource. LuceneSearch and LuceneSearchableObserver
 * should synchronize against LuceneLock prior to reading or writing
 * to the Lucene index.
 *
 * LuceneLock is necessary because Lucene is not thread safe and does
 * not allow the index to be modified when performing an ongoing
 * search.
 * @see <a
 * href="http://www.lucene.com/cgi-bin/faq/faqmanager.cgi?file=chapter.search&toc=faq#q41">http://www.lucene.com/cgi-bin/faq/faqmanager.cgi?file=chapter.search&toc=faq#q41</a>
 *
 * @author Richard Su (richard.su@alum.mit.edu)
 * @version $Id: LuceneLock.java 287 2005-02-22 00:29:02Z sskracic $
 *
 **/
class LuceneLock {

    private static final LuceneLock INSTANCE = new LuceneLock();

    //
    // Singleton Class
    private LuceneLock() {}

    public static LuceneLock getInstance() {
        return INSTANCE;
    }

}
