001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.processor.idempotent.jpa;
019    
020    import org.apache.camel.processor.idempotent.MessageIdRepository;
021    import org.springframework.orm.jpa.JpaCallback;
022    import org.springframework.orm.jpa.JpaTemplate;
023    import org.springframework.orm.jpa.JpaTransactionManager;
024    import org.springframework.transaction.TransactionDefinition;
025    import org.springframework.transaction.TransactionStatus;
026    import org.springframework.transaction.support.TransactionCallback;
027    import org.springframework.transaction.support.TransactionTemplate;
028    
029    import javax.persistence.EntityManager;
030    import javax.persistence.EntityManagerFactory;
031    import javax.persistence.Persistence;
032    import javax.persistence.PersistenceException;
033    
034    import java.util.List;
035    
036    /**
037     * @version $Revision: 1.1 $
038     */
039    public class JpaMessageIdRepository implements MessageIdRepository {
040        protected static final String QUERY_STRING = "select x from " + MessageProcessed.class.getName() + " x where x.processorName = ?1 and x.messageId = ?2";
041        private JpaTemplate jpaTemplate;
042        private String processorName;
043            private TransactionTemplate transactionTemplate;
044    
045        public static JpaMessageIdRepository jpaMessageIdRepository(String persistenceUnit, String processorName) {
046            EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnit);
047            return jpaMessageIdRepository(new JpaTemplate(entityManagerFactory), processorName);
048        }
049    
050        public static JpaMessageIdRepository jpaMessageIdRepository(JpaTemplate jpaTemplate, String processorName) {
051            return new JpaMessageIdRepository(jpaTemplate, processorName);
052        }
053    
054        public JpaMessageIdRepository(JpaTemplate template, String processorName) {
055            this(template, createTransactionTemplate(template), processorName);
056        }
057    
058        public JpaMessageIdRepository(JpaTemplate template, TransactionTemplate transactionTemplate, String processorName) {
059            this.jpaTemplate = template;
060            this.processorName = processorName;
061            this.transactionTemplate=transactionTemplate;
062        }
063        
064        static private TransactionTemplate createTransactionTemplate(JpaTemplate jpaTemplate) {
065            TransactionTemplate transactionTemplate = new TransactionTemplate();
066            transactionTemplate.setTransactionManager(new JpaTransactionManager(jpaTemplate.getEntityManagerFactory()));
067            transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
068            return transactionTemplate;
069        }
070    
071        public boolean contains(final String messageId) {
072            // Run this in single transaction.
073            Boolean rc = (Boolean) transactionTemplate.execute(new TransactionCallback(){
074                            public Object doInTransaction(TransactionStatus arg0) {
075                                    
076                            List list = jpaTemplate.find(QUERY_STRING, processorName, messageId);
077                            if (list.isEmpty()) {
078                                MessageProcessed processed = new MessageProcessed();
079                                processed.setProcessorName(processorName);
080                                processed.setMessageId(messageId);
081                                jpaTemplate.persist(processed);
082                                jpaTemplate.flush();
083                                return Boolean.FALSE;
084                            }
085                            else {
086                                return Boolean.TRUE;
087                            }
088                            }
089                    });
090            return rc.booleanValue();
091        }
092    }