IndexRebuildTask.java

/*
 * Copyright (c) www.bugull.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.tooan.ynpay.third.mongodb.lucene.backend;

import net.tooan.ynpay.third.jfinal.log.Logger;
import net.tooan.ynpay.third.mongodb.BuguEntity;
import net.tooan.ynpay.third.mongodb.cache.DaoCache;
import net.tooan.ynpay.third.mongodb.cache.IndexWriterCache;
import net.tooan.ynpay.third.mongodb.lucene.BuguIndex;
import net.tooan.ynpay.third.mongodb.mapper.InternalDao;
import net.tooan.ynpay.third.mongodb.mapper.MapperUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;

import java.io.IOException;
import java.util.List;

/**
 * @author Frank Wen(xbwen@hotmail.com)
 */
public class IndexRebuildTask implements Runnable {

    private final static Logger logger = Logger.getLogger(IndexRebuildTask.class);

    private Class<?> clazz;
    private IndexWriter writer;
    private int batchSize;

    public IndexRebuildTask(Class<?> clazz, int batchSize) {
        this.clazz = clazz;
        this.batchSize = batchSize;
        String[] name = MapperUtil.getEntityName(clazz);
        IndexWriterCache cache = IndexWriterCache.getInstance();
        writer = cache.get(StringUtils.join(name, "."));
    }

    @Override
    public void run() {
        BuguIndex index = BuguIndex.getInstance();
        if (index.isRebuilding()) {
            logger.error("Another rebuilding task is running");
            return;
        }
        index.setRebuilding(true);
        logger.info("Index rebuilding start...");
        try {
            writer.deleteAll();
        } catch (IOException ex) {
            logger.error("Something is wrong when lucene IndexWriter doing deleteAll()", ex);
        }
        InternalDao dao = DaoCache.getInstance().get(clazz);
        long count = dao.count();
        int pages = (int) (count / batchSize);
        int remainder = (int) (count % batchSize);
        if (pages > 0) {
            for (int i = 1; i <= pages; i++) {
                List list = dao.findForLucene(i, batchSize);
                process(list);
            }
        }
        //process the remainder
        if (remainder > 0) {
            List list = dao.findForLucene(++pages, batchSize);
            process(list);
        }
        index.setRebuilding(false);
        logger.info("Index rebuilding finish.");
    }

    private void process(List list) {
        for (Object o : list) {
            BuguEntity obj = (BuguEntity) o;
            process(obj);
        }
    }

    private void process(BuguEntity obj) {
        IndexFilterChecker checker = new IndexFilterChecker(obj);
        if (checker.needIndex()) {
            Document doc = new Document();
            IndexCreator creator = new IndexCreator(obj, "");
            creator.create(doc);
            try {
                writer.addDocument(doc);
            } catch (CorruptIndexException ex) {
                logger.error("IndexWriter can not add a document to the lucene index", ex);
            } catch (IOException ex) {
                logger.error("IndexWriter can not add a document to the lucene index", ex);
            }
        }
    }

}