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/*-
* ============LICENSE_START=======================================================
* feature-session-persistence
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.persistence;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JpaDroolsSessionConnector implements DroolsSessionConnector {
private static Logger logger = LoggerFactory.getLogger(JpaDroolsSessionConnector.class);
private final EntityManagerFactory emf;
public JpaDroolsSessionConnector(EntityManagerFactory emf) {
this.emf = emf;
}
@Override
public DroolsSession get(String sessName) {
EntityManager em = emf.createEntityManager();
DroolsSessionEntity entity = null;
try (EntityMgrTrans trans = new EntityMgrTrans(em)) {
entity = em.find(DroolsSessionEntity.class, sessName);
if (entity != null) {
em.refresh(entity);
}
trans.commit();
}
return entity;
}
@Override
public void replace(DroolsSession sess) {
String sessName = sess.getSessionName();
logger.info("replace: Entering and manually updating session name= {}", sessName);
EntityManager em = emf.createEntityManager();
try (EntityMgrTrans trans = new EntityMgrTrans(em)) {
if (!update(em, sess)) {
add(em, sess);
}
trans.commit();
}
logger.info("replace: Exiting");
}
/**
* Adds a session to the persistent store.
*
* @param em entity manager
* @param sess session to be added
*/
private void add(EntityManager em, DroolsSession sess) {
logger.info("add: Inserting session id={}", sess.getSessionId());
DroolsSessionEntity ent = new DroolsSessionEntity(sess.getSessionName(), sess.getSessionId());
em.persist(ent);
}
/**
* Updates a session, if it exists within the persistent store.
*
* @param em entity manager
* @param sess session data to be persisted
* @return {@code true} if a record was updated, {@code false} if it was not found
*/
private boolean update(EntityManager em, DroolsSession sess) {
DroolsSessionEntity session = em.find(DroolsSessionEntity.class, sess.getSessionName());
if (session == null) {
return false;
}
logger.info("update: Updating session id to {}", sess.getSessionId());
session.setSessionId(sess.getSessionId());
return true;
}
}
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