/*
* 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);
}
}