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 }