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/*
* ============LICENSE_START=======================================================
* feature-session-persistence
* ================================================================================
* Copyright (C) 2017-2018, 2021 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.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;
import org.onap.policy.common.utils.jpa.EntityMgrCloser;
/**
* Wrapper for an <i>EntityManager</i> that creates a JTA transaction that is auto-rolled
* back when closed. Note: commit() and rollback() actions do nothing if a transaction was
* already in progress when this object was constructed.
*/
public class EntityMgrTrans extends EntityMgrCloser {
/**
* Transaction to be rolled back.
*/
@Getter(AccessLevel.PROTECTED)
@Setter(AccessLevel.PROTECTED)
private static UserTransaction userTrans = com.arjuna.ats.jta.UserTransaction.userTransaction();
/**
* {@code True} if a transaction had already been started before this object was
* constructed, {@code false} otherwise.
*/
private boolean transInProgress;
/**
* Constructor.
*
* @param em entity for which a transaction is to be begun
*/
public EntityMgrTrans(EntityManager em) {
super(em);
try {
transInProgress = (userTrans.getStatus() == Status.STATUS_ACTIVE);
if (!transInProgress) {
userTrans.begin();
}
em.joinTransaction();
} catch (RuntimeException | NotSupportedException | SystemException e) {
em.close();
throw new EntityMgrException(e);
}
}
/**
* Commits the transaction.
*/
public void commit() {
if (transInProgress) {
return;
}
try {
userTrans.commit();
} catch (SecurityException | IllegalStateException | RollbackException | HeuristicMixedException
| HeuristicRollbackException | SystemException e) {
throw new EntityMgrException(e);
}
}
/**
* Rolls back the transaction.
*/
public void rollback() {
if (transInProgress) {
return;
}
try {
userTrans.rollback();
} catch (IllegalStateException | SecurityException | SystemException e) {
throw new EntityMgrException(e);
}
}
@Override
public void close() {
try {
if (!transInProgress && userTrans.getStatus() == Status.STATUS_ACTIVE) {
userTrans.rollback();
}
} catch (IllegalStateException | SecurityException | SystemException e) {
throw new EntityMgrException(e);
} finally {
super.close();
}
}
/**
* Runtime exceptions generated by this class. Wraps exceptions generated by delegated
* operations, particularly when they are not, themselves, Runtime exceptions.
*/
public static class EntityMgrException extends RuntimeException {
private static final long serialVersionUID = 1L;
/**
* Constructor.
*
* @param ex exception to be wrapped
*/
public EntityMgrException(Exception ex) {
super(ex);
}
}
}
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