org.zanata.search.SimpleClassIndexingStrategy.java Source code

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Here is the source code for org.zanata.search.SimpleClassIndexingStrategy.java

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/*
 * Copyright 2010, Red Hat, Inc. and individual contributors as indicated by the
 * @author tags. See the copyright.txt file in the distribution for a full
 * listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF
 * site: http://www.fsf.org.
 */
package org.zanata.search;

import org.hibernate.Query;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.search.FullTextSession;

import lombok.extern.slf4j.Slf4j;

/**
 * Indexing strategy that fetches all instances in a given class and indexes
 * them. This class batches the fetching of the entities and might be a bit
 * slower as it does not account for lazily loaded entity relationships.
 *
 * @author Carlos Munoz <a
 *         href="mailto:camunoz@redhat.com">camunoz@redhat.com</a>
 */
@Slf4j
public class SimpleClassIndexingStrategy<T> extends AbstractIndexingStrategy<T> {
    public static final int MAX_QUERY_ROWS = 5000;

    public SimpleClassIndexingStrategy(Class<T> entityType) {
        super(entityType);
    }

    @Override
    protected void onEntityIndexed(int rowNum, FullTextSession session) {
        if (rowNum % MAX_QUERY_ROWS == 0) {
            log.info("restarting query for {} (rowNum={})", getEntityType(), rowNum);
            getScrollableResults().close();
            setScrollableResults(queryResults(rowNum, session));
        }
    }

    @Override
    protected ScrollableResults queryResults(int offset, FullTextSession session) {
        Query query = session.createQuery("from " + getEntityType().getName());
        query.setFirstResult(offset);
        query.setMaxResults(MAX_QUERY_ROWS);
        return query.scroll(ScrollMode.FORWARD_ONLY);
    }

}