rebuildindextask.java

java servlet著名论坛源代码

/*
 * $Header: /cvsroot/mvnforum/mvnforum/src/com/mvnforum/search/RebuildIndexTask.java,v 1.4 2004/07/02 19:21:42 minhnn Exp $
 * $Author: minhnn $
 * $Revision: 1.4 $
 * $Date: 2004/07/02 19:21:42 $
 *
 * ====================================================================
 *
 * Copyright (C) 2002-2004 by MyVietnam.net
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * All copyright notices regarding mvnForum MUST remain intact
 * in the scripts and in the outputted HTML.
 * The "powered by" text/logo with a link back to
 * http://www.mvnForum.com and http://www.MyVietnam.net in the
 * footer of the pages MUST remain visible when the pages
 * are viewed on the internet or intranet.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Support can be obtained from support forums at:
 * http://www.mvnForum.com/mvnforum/index
 *
 * Correspondence and Marketing Questions can be sent to:
 * [e-mail]
 *
 * @author: Minh Nguyen  [e-mail]
 * @author: Dejan Krsmanovic [e-mail]
 */
package com.mvnforum.search;

import java.io.IOException;
import java.util.*;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.lucene.index.IndexWriter;
import com.mvnforum.db.DAOFactory;
import com.mvnforum.db.PostBean;

/**
 * Rebuilding indices task. This task do indexing of all documents
 */
public class RebuildIndexTask extends TimerTask
{
    private static Log log = LogFactory.getLog(RebuildIndexTask.class);

    //public static final int postGroupSize = 500;
    public static final int MERGE_FACTOR  = 20;

    private int maxPostID = 0;

    /*
     * Contructor with default access, prevent new an instance from outside package
     */
    RebuildIndexTask(int maxPostID) {
        this.maxPostID = maxPostID;
    }

    /**
     * Create new index. If anything exist already - delete it
     */
    public void run() {
        long start = System.currentTimeMillis();

        Collection posts = null;
        try {
            posts = DAOFactory.getPostDAO().getPosts();
        } catch (Exception ex) {
            log.error("RebuildIndexTask.run : cannot get all posts from database for indexing", ex);
        }

        if (posts == null) return;

        // we index it even when there are not any posts, this will
        // create an empty search index
        //if (posts.size() == 0) return;

        IndexWriter writer = null;
        try {
            writer = PostIndexer.getIndexWriter(true);
            writer.mergeFactor = MERGE_FACTOR;

            int i = 0;
            for (Iterator iter = posts.iterator(); iter.hasNext(); ) {
                PostBean post = (PostBean) iter.next();
                PostIndexer.doIndexPost(post, writer);
                i++;
            }
            writer.optimize();
            log.info("Rebuilding index finished successfully! " + i + " post(s) indexed");
        } catch (Exception e) {
            log.error("Error while rebuilding index", e);
        } finally {
            try {
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException ignore) {
            }
        }
        log.info("RebuildIndexTask took " + (System.currentTimeMillis() - start) + " ms");
    }
}