package org.hibernate.search.batchindexing.impl;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
import org.hibernate.search.exception.ErrorHandler;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.SessionFactory;
import org.hibernate.StatelessSession;
import org.hibernate.Session;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.search.util.logging.impl.LoggerFactory;
import org.hibernate.engine.transaction.spi.TransactionFactory;
import org.hibernate.service.jta.platform.spi.JtaPlatform;
/**
* 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 Runnable {
private static final Log log = LoggerFactory.make();
private final SessionFactoryImplementor factory;
private final SessionAwareRunnable sessionAwareRunnable;
private final StatelessSessionAwareRunnable statelessSessionAwareRunnable;
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.sessionAwareRunnable = sessionAwareRunnable;
this.statelessSessionAwareRunnable = null;
this.errorHandler = errorHandler;
}
public OptionallyWrapInJTATransaction(SessionFactory factory, ErrorHandler errorHandler, StatelessSessionAwareRunnable statelessSessionAwareRunnable) {
/*
* 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.sessionAwareRunnable = null;
this.statelessSessionAwareRunnable = statelessSessionAwareRunnable;
this.errorHandler = errorHandler;
}
public void run() {
try {
final boolean wrapInTransaction = wrapInTransaction();
if ( wrapInTransaction ) {
TransactionManager transactionManager = getTransactionManager();
try {
final Session session;
final StatelessSession statelessSession;
if ( sessionAwareRunnable != null ) {
session = factory.openSession();
statelessSession = null;
}
else {
session = null;
statelessSession = factory.openStatelessSession();
}
transactionManager.begin();
if ( sessionAwareRunnable != null ) {
sessionAwareRunnable.run( session );
}
else {
statelessSessionAwareRunnable.run( statelessSession );
}
transactionManager.commit();
if ( sessionAwareRunnable != null ) {
session.close();
}
else {
statelessSession.close();
}
}
catch (Throwable e) {
errorHandler.handleException( log.massIndexerUnexpectedErrorMessage() , e);
try {
transactionManager.rollback();
}
catch ( SystemException e1 ) {
// we already have an exception, don't propagate this one
log.errorRollbackingTransaction( e.getMessage(), e1 );
}
}
}
else {
if ( sessionAwareRunnable != null ) {
sessionAwareRunnable.run( null );
}
else {
statelessSessionAwareRunnable.run( null );
}
}
}
catch (Throwable e) {
errorHandler.handleException( log.massIndexerUnexpectedErrorMessage() , e);
}
}
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;
}
}