Java tutorial
/* * iteraplan is an IT Governance web application developed by iteratec, GmbH * Copyright (C) 2004 - 2014 iteratec, GmbH * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU Affero General Public License version 3 as published by * the Free Software Foundation with the addition of the following permission * added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED * WORK IN WHICH THE COPYRIGHT IS OWNED BY ITERATEC, ITERATEC DISCLAIMS THE * WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. * * This program 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 General Public License for more * details. * * You should have received a copy of the GNU Affero General Public License * along with this program; if not, see http://www.gnu.org/licenses or write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA. * * You can contact iteratec GmbH headquarters at Inselkammerstr. 4 * 82008 Munich - Unterhaching, Germany, or at email address info@iteratec.de. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License version 3. * * In accordance with Section 7(b) of the GNU Affero General Public License * version 3, these Appropriate Legal Notices must retain the display of the * "iteraplan" logo. If the display of the logo is not reasonably * feasible for technical reasons, the Appropriate Legal Notices must display * the words "Powered by iteraplan". */ package de.iteratec.iteraplan.persistence.dao; import java.util.List; import java.util.Set; import org.apache.lucene.index.IndexReader; import org.apache.lucene.search.Query; import org.apache.lucene.search.Sort; import org.hibernate.CacheMode; import org.hibernate.FlushMode; import org.hibernate.ScrollMode; import org.hibernate.ScrollableResults; import org.hibernate.Session; import org.hibernate.search.FullTextQuery; import org.hibernate.search.FullTextSession; import org.hibernate.search.SearchFactory; import org.hibernate.search.impl.FullTextSessionImpl; import org.hibernate.search.reader.ReaderProvider; import org.hibernate.search.store.DirectoryProvider; import de.iteratec.iteraplan.common.Logger; import de.iteratec.iteraplan.persistence.search.IteraFullTextSessionImpl; /** * Implementation of the DAO interface {@link SearchDAO}. */ public class SearchDAOImpl extends GenericBaseDAO<de.iteratec.iteraplan.model.Search, Integer> implements SearchDAO { private static final Logger LOGGER = Logger.getIteraplanLogger(SearchDAOImpl.class); /** {@inheritDoc} */ @Override protected String getNameAttribute() { return null; } /** {@inheritDoc} */ public void createIndexes(Set<Class<?>> classList) { Session session = this.getSession(); FullTextSession fullTextSession = getFullTextSession(); session.setFlushMode(FlushMode.MANUAL); // Disable flush operations session.setCacheMode(CacheMode.IGNORE); // Disable second-level cache operations int batchSize = 100; // data is read from the database for (Class<?> bbClass : classList) { ScrollableResults results = session.createCriteria(bbClass).setFetchSize(batchSize) .scroll(ScrollMode.SCROLL_INSENSITIVE); LOGGER.info("Indexing " + bbClass.getSimpleName()); int index = 0; while (results.next()) { index++; // entities are indexed fullTextSession.index(results.get(0)); if (index % batchSize == 0) { fullTextSession.flushToIndexes(); fullTextSession.clear(); } } results.close(); LOGGER.info("Index for " + bbClass.getSimpleName() + " was created!"); } } /** {@inheritDoc} */ public void purgeIndexes(Set<Class<?>> classList) { FullTextSession fullTextSession = getFullTextSession(); for (Class<?> bbClass : classList) { // Index is purged LOGGER.info(bbClass.getSimpleName() + " is deleted from index"); fullTextSession.purgeAll(bbClass); // optimize the index LOGGER.info(bbClass + " optimize index!"); fullTextSession.getSearchFactory().optimize(bbClass); LOGGER.info(bbClass + " was deleted from index"); } } /** {@inheritDoc} */ @SuppressWarnings("unchecked") public List<Object[]> search(Query luceneQuery, Sort sortOrder, Class<?>[] classArray, String[] projections) { FullTextSession fullTextSession = getFullTextSession(); // Results are fetched for the query FullTextQuery ftquery = fullTextSession.createFullTextQuery(luceneQuery, classArray); ftquery.setSort(sortOrder); // Projection-Query returns a list of Object[] return ftquery.setProjection(projections).list(); } /** {@inheritDoc} */ public IndexReader openReader(ReaderProvider readerProvider, Class<?>[] classes) { // create the directory provider DirectoryProvider<?>[] providers = new DirectoryProvider<?>[classes.length]; for (int i = 0; i < classes.length; i++) { providers[i] = getSearchFactory().getDirectoryProviders(classes[i])[0]; } // fetch and open the reader return readerProvider.openReader(providers); } /** {@inheritDoc} */ public ReaderProvider getReaderProvider() { return getSearchFactory().getReaderProvider(); } private SearchFactory getSearchFactory() { return getFullTextSession().getSearchFactory(); } private FullTextSession getFullTextSession() { Session session = this.getSession(); if (session instanceof FullTextSessionImpl) { return (FullTextSession) session; } else { return new IteraFullTextSessionImpl(session); } } }