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    }