| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.ode.dao.jpa; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.openjpa.persistence.OpenJPAPersistence; |
| import org.apache.openjpa.persistence.OpenJPAQuery; |
| |
| import javax.persistence.EntityManager; |
| import javax.persistence.Query; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * @author Matthieu Riou <mriou at apache dot org> |
| */ |
| public class OpenJPADAO { |
| private static final Log __log = LogFactory.getLog(OpenJPADAO.class); |
| |
| protected BPELDAOConnectionImpl getConn() { |
| return BPELDAOConnectionFactoryImpl._connections.get(); |
| } |
| |
| protected EntityManager getEM() { |
| return OpenJPAPersistence.getEntityManager(this); |
| } |
| |
| /** |
| * javax.persistence.Query either let you query for a collection or a single |
| * value throwing an exception if nothing is found. Just a convenient shortcut |
| * for single results allowing null values |
| * @param qry query to execute |
| * @return whatever you assign it to |
| */ |
| @SuppressWarnings("unchecked") |
| protected <T> T getSingleResult(Query qry) { |
| List res = qry.getResultList(); |
| if (res.size() == 0) return null; |
| return (T) res.get(0); |
| } |
| |
| protected <T> void batchUpdateByIds(Iterator<T> ids, Query query, String parameterName) { |
| if( query instanceof OpenJPAQuery ) { |
| OpenJPAQuery openJpaQuery = (OpenJPAQuery)query; |
| int batchSize = openJpaQuery.getFetchPlan().getFetchBatchSize(); |
| if( __log.isTraceEnabled() ) __log.trace("BATCH fetchBatchSize = " + batchSize); |
| List<T> batch = new ArrayList<T>(); |
| while( ids.hasNext() ) { |
| for( int i = 0; i < batchSize && ids.hasNext(); i++ ) { |
| batch.add(ids.next()); |
| } |
| if( __log.isTraceEnabled() ) __log.trace("BATCH updating " + batch.size() + " objects."); |
| query.setParameter(parameterName, batch); |
| query.executeUpdate(); |
| batch.clear(); |
| } |
| } |
| } |
| } |