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 java.util.Iterator;
020
021 import javax.persistence.EntityManager;
022 import javax.persistence.PersistenceException;
023
024 import org.apache.camel.Exchange;
025 import org.apache.camel.Expression;
026 import org.apache.camel.converter.ObjectConverter;
027 import org.apache.camel.impl.DefaultProducer;
028
029 import org.springframework.orm.jpa.JpaCallback;
030
031 /**
032 * @version $Revision: 563665 $
033 */
034 public class JpaProducer extends DefaultProducer<Exchange> {
035 private final TransactionStrategy template;
036 private final Expression<Exchange> expression;
037
038 public JpaProducer(JpaEndpoint endpoint, Expression<Exchange> expression) {
039 super(endpoint);
040 this.expression = expression;
041 this.template = endpoint.createTransactionStrategy();
042 }
043
044 public void process(Exchange exchange) {
045 final Object values = expression.evaluate(exchange);
046 if (values != null) {
047 template.execute(new JpaCallback() {
048 public Object doInJpa(EntityManager entityManager) throws PersistenceException {
049 Iterator iter = ObjectConverter.iterator(values);
050 while (iter.hasNext()) {
051 Object value = iter.next();
052 entityManager.persist(value);
053 }
054 return null;
055 }
056 });
057 }
058 }
059 }