org.wallride.service.SystemService Maven / Gradle / Ivy

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/*
 * Copyright 2014 Tagbangers, Inc.
 *
 * 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 org.wallride.service;

import org.hibernate.*;
import org.hibernate.search.FullTextSession;
import org.hibernate.search.Search;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Service
public class SystemService {

	private static final int BATCH_SIZE = 100;

	private static Logger logger = LoggerFactory.getLogger(SystemService.class);

	@PersistenceContext
	private EntityManager entityManager;

	@Async
	@Transactional(propagation = Propagation.SUPPORTS)
	public void reIndex() throws Exception {
		logger.info("Re-Index started");

		FullTextSession fullTextSession = Search.getFullTextSession((entityManager.unwrap(Session.class)));

		fullTextSession.setFlushMode(FlushMode.MANUAL);
		fullTextSession.setCacheMode(CacheMode.IGNORE);

		for (Class persistentClass : fullTextSession.getSearchFactory().getIndexedTypes()) {
			Transaction transaction = fullTextSession.beginTransaction();

			// Scrollable results will avoid loading too many objects in memory
			ScrollableResults results = fullTextSession.createCriteria(persistentClass)
					.setFetchSize(BATCH_SIZE)
					.scroll(ScrollMode.FORWARD_ONLY);
			int index = 0;
			while (results.next()) {
				index++;
				fullTextSession.index(results.get(0)); //index each element
				if (index % BATCH_SIZE == 0) {
					fullTextSession.flushToIndexes(); //apply changes to indexes
					fullTextSession.clear(); //free memory since the queue is processed
				}
			}
			transaction.commit();
		}
		logger.info("Re-Index finished");
	}
}