//$Id: DefaultAutoFlushEventListener.java 7785 2005-08-08 23:24:44Z oneovthafew $
package org.hibernate.event.def;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.event.AutoFlushEvent;
import org.hibernate.event.AutoFlushEventListener;
import org.hibernate.event.EventSource;
/**
* 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 Log log = LogFactory.getLog(DefaultAutoFlushEventListener.class);
/** 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();
if ( flushMightBeNeeded(source) ) {
final int oldSize = source.getActionQueue().numberOfCollectionRemovals();
flushEverythingToExecutions(event);
if ( flushIsReallyNeeded(event, source) ) {
log.trace("Need to execute flush");
performExecutions(source);
postFlush(source);
// note: performExecutions() clears all collectionXxxxtion
// collections (the collection actions) in the session
if ( source.getFactory().getStatistics().isStatisticsEnabled() ) {
source.getFactory().getStatisticsImplementor().flush();
}
}
else {
log.trace("Dont need to execute flush");
source.getActionQueue().clearFromFlushNeededCheck( oldSize );
}
event.setFlushRequired( flushIsReallyNeeded( event, source ) );
}
}
private boolean flushIsReallyNeeded(AutoFlushEvent event, final EventSource source) {
return source.getActionQueue()
.areTablesToBeUpdated( event.getQuerySpaces() ) ||
source.getFlushMode()==FlushMode.ALWAYS;
}
private boolean flushMightBeNeeded(final EventSource source) {
return !source.getFlushMode().lessThan(FlushMode.AUTO) &&
source.getDontFlushFromFind() == 0 &&
source.getPersistenceContext().hasNonReadOnlyEntities();
}
}
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