org.zanata.search.ClassIndexer.java Source code

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

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/*
 * Copyright 2013, 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 lombok.extern.slf4j.Slf4j;

import org.hibernate.CacheMode;
import org.hibernate.FlushMode;
import org.hibernate.criterion.Projections;
import org.hibernate.search.FullTextSession;
import org.zanata.async.AsyncTaskHandle;

/**
 * @author Sean Flanigan <a
 *         href="mailto:sflaniga@redhat.com">sflaniga@redhat.com</a>
 *
 */
@Slf4j
public class ClassIndexer<T> {

    private final AbstractIndexingStrategy<T> indexingStrategy;
    private AsyncTaskHandle handle;
    private Class<?> entityType;

    public ClassIndexer(AsyncTaskHandle handle, Class<?> entityType, AbstractIndexingStrategy<T> indexingStrategy) {
        this.handle = handle;
        this.entityType = entityType;
        this.indexingStrategy = indexingStrategy;
    }

    public AbstractIndexingStrategy<T> getIndexingStrategy() {
        return indexingStrategy;
    }

    public int getEntityCount(FullTextSession session) {
        Long result = (Long) session.createCriteria(entityType).setProjection(Projections.rowCount()).list().get(0);
        return result.intValue();
    }

    public void index(FullTextSession session) throws Exception {
        log.info("Setting manual-flush and ignore-cache for {}", entityType);
        session.setFlushMode(FlushMode.MANUAL);
        session.setCacheMode(CacheMode.IGNORE);
        indexingStrategy.invoke(handle, session);
        session.flushToIndexes(); // apply changes to indexes
        session.clear(); // clear since the queue is processed
    }

}