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/*-
* ============LICENSE_START=======================================================
* feature-session-persistence
* ================================================================================
* Copyright (C) 2017 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.EntityTransaction;
/**
* Wrapper for an <i>EntityManager</i> that creates a transaction that is
* auto-rolled back when closed.
*/
public class EntityMgrTrans extends EntityMgrCloser {
/**
* Transaction to be rolled back.
*/
private EntityTransaction trans;
/**
*
* @param em
* entity for which a transaction is to be begun
*/
public EntityMgrTrans(EntityManager em) {
super(em);
try {
trans = em.getTransaction();
trans.begin();
} catch (RuntimeException e) {
em.close();
throw e;
}
}
/**
* Commits the transaction.
*/
public void commit() {
trans.commit();
}
/**
* Rolls back the transaction.
*/
public void rollback() {
trans.rollback();
}
@Override
public void close() {
try {
if (trans.isActive()) {
trans.rollback();
}
} finally {
super.close();
}
}
}
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