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.component.jpa;
019
020 import org.apache.camel.Exchange;
021 import org.apache.camel.Expression;
022 import org.apache.camel.converter.ObjectConverter;
023 import org.apache.camel.impl.DefaultProducer;
024 import org.springframework.orm.jpa.JpaCallback;
025
026 import javax.persistence.EntityManager;
027 import javax.persistence.PersistenceException;
028 import java.util.Iterator;
029
030 /**
031 * @version $Revision: 525547 $
032 */
033 public class JpaProducer extends DefaultProducer<Exchange> {
034 private final TransactionStrategy template;
035 private final Expression<Exchange> expression;
036
037 public JpaProducer(JpaEndpoint endpoint, Expression<Exchange> expression) {
038 super(endpoint);
039 this.expression = expression;
040 this.template = endpoint.createTransactionStrategy();
041 }
042
043 public void process(Exchange exchange) {
044 final Object values = expression.evaluate(exchange);
045 if (values != null) {
046 template.execute(new JpaCallback() {
047 public Object doInJpa(EntityManager entityManager) throws PersistenceException {
048 Iterator iter = ObjectConverter.iterator(values);
049 while (iter.hasNext()) {
050 Object value = iter.next();
051 entityManager.persist(value);
052 }
053 return null;
054 }
055 });
056 }
057 }
058 }