/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.component.jpa;
import java.util.Collection;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.impl.DefaultProducer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionTemplate;
import static org.apache.camel.component.jpa.JpaHelper.getTargetEntityManager;
/**
* @version
*/
public class JpaProducer extends DefaultProducer {
private static final Logger LOG = LoggerFactory.getLogger(JpaProducer.class);
private final EntityManagerFactory entityManagerFactory;
private final TransactionTemplate transactionTemplate;
private final Expression expression;
public JpaProducer(JpaEndpoint endpoint, Expression expression) {
super(endpoint);
this.expression = expression;
this.entityManagerFactory = endpoint.getEntityManagerFactory();
this.transactionTemplate = endpoint.createTransactionTemplate();
}
@Override
public JpaEndpoint getEndpoint() {
return (JpaEndpoint) super.getEndpoint();
}
public void process(final Exchange exchange) {
// resolve the entity manager before evaluating the expression
final EntityManager entityManager = getTargetEntityManager(exchange, entityManagerFactory, getEndpoint().isUsePassedInEntityManager());
final Object values = expression.evaluate(exchange, Object.class);
if (values != null) {
transactionTemplate.execute(new TransactionCallback<Object>() {
public Object doInTransaction(TransactionStatus status) {
if (getEndpoint().isJoinTransaction()) {
entityManager.joinTransaction();
}
if (values.getClass().isArray()) {
Object[] array = (Object[])values;
for (Object element : array) {
save(element);
}
} else if (values instanceof Collection) {
Collection<?> collection = (Collection<?>)values;
for (Object entity : collection) {
save(entity);
}
} else {
Object managedEntity = save(values);
if (!getEndpoint().isUsePersist()) {
exchange.getIn().setBody(managedEntity);
}
}
if (getEndpoint().isFlushOnSend()) {
entityManager.flush();
}
return null;
}
/**
* Save the given entity end return the managed entity
*
* @return the managed entity
*/
private Object save(final Object entity) {
LOG.debug("save: {}", entity);
if (getEndpoint().isUsePersist()) {
entityManager.persist(entity);
return entity;
} else {
return entityManager.merge(entity);
}
}
});
}
}
}