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    }