001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.jpa;
018    
019    import javax.persistence.EntityManager;
020    import javax.persistence.EntityManagerFactory;
021    import javax.persistence.PersistenceException;
022    
023    import org.apache.camel.impl.ServiceSupport;
024    
025    import org.springframework.orm.jpa.JpaCallback;
026    import org.springframework.orm.jpa.JpaTemplate;
027    import org.springframework.orm.jpa.JpaTransactionManager;
028    import org.springframework.transaction.TransactionStatus;
029    import org.springframework.transaction.support.TransactionCallback;
030    import org.springframework.transaction.support.TransactionTemplate;
031    
032    /**
033     * Delegates the strategy to the {@link JpaTemplate} and {@link TransactionTemplate} for transaction handling
034     *
035     * @version $Revision: 563665 $
036     */
037    public class JpaTemplateTransactionStrategy extends ServiceSupport implements TransactionStrategy {
038        private final JpaTemplate jpaTemplate;
039        private final TransactionTemplate transactionTemplate;
040    
041        public JpaTemplateTransactionStrategy(JpaTemplate jpaTemplate, TransactionTemplate transactionTemplate) {
042            this.jpaTemplate = jpaTemplate;
043            this.transactionTemplate = transactionTemplate;
044        }
045    
046        /**
047         * Creates a new implementation from the given JPA factory
048         */
049        public static JpaTemplateTransactionStrategy newInstance(EntityManagerFactory emf) {
050            JpaTemplate template = new JpaTemplate(emf);
051            return newInstance(emf, template);
052        }
053    
054        public static JpaTemplateTransactionStrategy newInstance(EntityManagerFactory emf, JpaTemplate template) {
055            JpaTransactionManager transactionManager = new JpaTransactionManager(emf);
056            transactionManager.afterPropertiesSet();
057    
058            TransactionTemplate tranasctionTemplate = new TransactionTemplate(transactionManager);
059            tranasctionTemplate.afterPropertiesSet();
060    
061            return new JpaTemplateTransactionStrategy(template, tranasctionTemplate);
062        }
063    
064        public Object execute(final JpaCallback callback) {
065            return transactionTemplate.execute(new TransactionCallback() {
066                public Object doInTransaction(TransactionStatus status) {
067                    return jpaTemplate.execute(new JpaCallback() {
068                        public Object doInJpa(EntityManager entityManager) throws PersistenceException {
069                            return callback.doInJpa(entityManager);
070                        }
071                    });
072                }
073            });
074        }
075    
076        protected void doStart() throws Exception {
077        }
078    
079        protected void doStop() throws Exception {
080        }
081    }