/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.ogm.massindex.impl;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.transaction.jta.platform.spi.JtaPlatform;
import org.hibernate.engine.transaction.spi.TransactionFactory;
import org.hibernate.ogm.dialect.spi.ModelConsumer;
import org.hibernate.ogm.model.spi.Tuple;
import org.hibernate.search.exception.ErrorHandler;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* Wrap the subsequent Runnable in a JTA Transaction if necessary:
* - if the existing Hibernate Core transaction strategy requires a TransactionManager
* - if no JTA transaction is already started
*
* Unfortunately at this time we need to have access to SessionFactoryImplementor
*
* @author Emmanuel Bernard
*/
public class OptionallyWrapInJTATransaction implements ModelConsumer {
private static final Log log = LoggerFactory.make();
private final SessionFactoryImplementor factory;
private final SessionAwareRunnable delegate;
private final ErrorHandler errorHandler;
public OptionallyWrapInJTATransaction(SessionFactory factory, ErrorHandler errorHandler,
SessionAwareRunnable sessionAwareRunnable) {
/*
* Unfortunately we need to access SessionFactoryImplementor to detect:
* - whether or not we need to start the JTA transaction
* - start it
*/
// TODO get SessionFactoryImplementor it from the SearchFactory as we might get a hold of the SFI at startup
// time
// if that's the case, SearchFactory should expose something like T unwrap(Class<T> clazz);
this.factory = (SessionFactoryImplementor) factory;
this.delegate = sessionAwareRunnable;
this.errorHandler = errorHandler;
}
private TransactionManager getTransactionManager() {
return factory.getServiceRegistry().getService( JtaPlatform.class ).retrieveTransactionManager();
}
boolean wrapInTransaction() {
final TransactionFactory transactionFactory = factory.getServiceRegistry()
.getService( TransactionFactory.class );
if ( !transactionFactory.compatibleWithJtaSynchronization() ) {
// Today we only require a TransactionManager on JTA based transaction factories
log.trace( "TransactionFactory does not require a TransactionManager: don't wrap in a JTA transaction" );
return false;
}
final TransactionManager transactionManager = getTransactionManager();
if ( transactionManager == null ) {
// no TM, nothing to do OR configuration mistake
log.trace( "No TransactionManager found, do not start a surrounding JTA transaction" );
return false;
}
try {
if ( transactionManager.getStatus() == Status.STATUS_NO_TRANSACTION ) {
log.trace( "No Transaction in progress, needs to start a JTA transaction" );
return true;
}
}
catch ( SystemException e ) {
log.cannotGuessTransactionStatus( e );
return false;
}
log.trace( "Transaction in progress, no needs to start a JTA transaction" );
return false;
}
@Override
public void consume(Tuple tuple) {
try {
final boolean wrapInTransaction = wrapInTransaction();
if ( wrapInTransaction ) {
consumeInTransaction( tuple );
}
else {
delegate.run( null, tuple );
}
}
catch ( Throwable e ) {
errorHandler.handleException( log.massIndexerUnexpectedErrorMessage(), e );
}
}
private void consumeInTransaction(Tuple tuple) {
TransactionManager transactionManager = getTransactionManager();
try {
final Session session = factory.openSession();
transactionManager.begin();
delegate.run( session, tuple );
transactionManager.commit();
session.close();
}
catch ( Throwable e ) {
errorHandler.handleException( log.massIndexerUnexpectedErrorMessage(), e );
rollback( transactionManager, e );
}
}
private void rollback(TransactionManager transactionManager, Throwable e) {
try {
transactionManager.rollback();
}
catch ( SystemException e1 ) {
// we already have an exception, don't propagate this one
log.errorRollingBackTransaction( e.getMessage(), e1 );
}
}
}