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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.event.internal;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.ActionQueue;
import org.hibernate.engine.spi.PersistenceContext;
import org.hibernate.engine.spi.SessionEventListenerManager;
import org.hibernate.event.spi.AutoFlushEvent;
import org.hibernate.event.spi.AutoFlushEventListener;
import org.hibernate.event.spi.EventSource;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.stat.spi.StatisticsImplementor;
import org.jboss.logging.Logger;
/**
* Defines the default flush event listeners used by hibernate for
* flushing session state in response to generated auto-flush events.
*
* @author Steve Ebersole
*/
public class DefaultAutoFlushEventListener extends AbstractFlushingEventListener implements AutoFlushEventListener {
private static final CoreMessageLogger LOG = Logger.getMessageLogger( CoreMessageLogger.class, DefaultAutoFlushEventListener.class.getName() );
/**
* Handle the given auto-flush event.
*
* @param event
* The auto-flush event to be handled.
* @throws HibernateException
*/
public void onAutoFlush(AutoFlushEvent event) throws HibernateException {
final EventSource source = event.getSession();
final SessionEventListenerManager eventListenerManager = source.getEventListenerManager();
try {
eventListenerManager.partialFlushStart();
if ( flushMightBeNeeded( source ) ) {
// Need to get the number of collection removals before flushing to executions
// (because flushing to executions can add collection removal actions to the action queue).
final ActionQueue actionQueue = source.getActionQueue();
final int oldSize = actionQueue.numberOfCollectionRemovals();
flushEverythingToExecutions( event );
if ( flushIsReallyNeeded( event, source ) ) {
LOG.trace( "Need to execute flush" );
event.setFlushRequired( true );
// note: performExecutions() clears all collectionXxxxtion
// collections (the collection actions) in the session
performExecutions( source );
postFlush( source );
postPostFlush( source );
final StatisticsImplementor statistics = source.getFactory().getStatistics();
if ( statistics.isStatisticsEnabled() ) {
statistics.flush();
}
}
else {
LOG.trace( "Don't need to execute flush" );
event.setFlushRequired( false );
actionQueue.clearFromFlushNeededCheck( oldSize );
}
}
}
finally {
eventListenerManager.partialFlushEnd(
event.getNumberOfEntitiesProcessed(),
event.getNumberOfEntitiesProcessed()
);
}
}
private boolean flushIsReallyNeeded(AutoFlushEvent event, final EventSource source) {
return source.getHibernateFlushMode() == FlushMode.ALWAYS
|| source.getActionQueue().areTablesToBeUpdated( event.getQuerySpaces() );
}
private boolean flushMightBeNeeded(final EventSource source) {
final PersistenceContext persistenceContext = source.getPersistenceContextInternal();
return !source.getHibernateFlushMode().lessThan( FlushMode.AUTO )
&& source.getDontFlushFromFind() == 0
&& ( persistenceContext.getNumberOfManagedEntities() > 0 ||
persistenceContext.getCollectionEntriesSize() > 0 );
}
}