/**
* 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.processor.idempotent.jpa;
import java.util.List;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.apache.camel.processor.idempotent.MessageIdRepository;
import org.springframework.orm.jpa.JpaTemplate;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionTemplate;
/**
* @version $Revision: 630591 $
*/
public class JpaMessageIdRepository implements MessageIdRepository {
protected static final String QUERY_STRING = "select x from " + MessageProcessed.class.getName() + " x where x.processorName = ?1 and x.messageId = ?2";
private JpaTemplate jpaTemplate;
private String processorName;
private TransactionTemplate transactionTemplate;
public JpaMessageIdRepository(JpaTemplate template, String processorName) {
this(template, createTransactionTemplate(template), processorName);
}
public JpaMessageIdRepository(JpaTemplate template, TransactionTemplate transactionTemplate, String processorName) {
this.jpaTemplate = template;
this.processorName = processorName;
this.transactionTemplate = transactionTemplate;
}
public static JpaMessageIdRepository jpaMessageIdRepository(String persistenceUnit, String processorName) {
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnit);
return jpaMessageIdRepository(new JpaTemplate(entityManagerFactory), processorName);
}
public static JpaMessageIdRepository jpaMessageIdRepository(JpaTemplate jpaTemplate, String processorName) {
return new JpaMessageIdRepository(jpaTemplate, processorName);
}
private static TransactionTemplate createTransactionTemplate(JpaTemplate jpaTemplate) {
TransactionTemplate transactionTemplate = new TransactionTemplate();
transactionTemplate.setTransactionManager(new JpaTransactionManager(jpaTemplate.getEntityManagerFactory()));
transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
return transactionTemplate;
}
public boolean contains(final String messageId) {
// Run this in single transaction.
Boolean rc = (Boolean)transactionTemplate.execute(new TransactionCallback() {
public Object doInTransaction(TransactionStatus arg0) {
List list = jpaTemplate.find(QUERY_STRING, processorName, messageId);
if (list.isEmpty()) {
MessageProcessed processed = new MessageProcessed();
processed.setProcessorName(processorName);
processed.setMessageId(messageId);
jpaTemplate.persist(processed);
jpaTemplate.flush();
return Boolean.FALSE;
} else {
return Boolean.TRUE;
}
}
});
return rc.booleanValue();
}
}