Package org.hibernate.event.def

Source Code of org.hibernate.event.def.DefaultAutoFlushEventListener

//$Id: DefaultAutoFlushEventListener.java 7785 2005-08-08 23:24:44Z oneovthafew $
package org.hibernate.event.def;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 Logger log = LoggerFactory.getLogger(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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