Package org.hibernate.event.def

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

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*
*/
package org.hibernate.event.def;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.engine.Cascade;
import org.hibernate.engine.CascadingAction;
import org.hibernate.engine.EntityEntry;
import org.hibernate.engine.EntityKey;
import org.hibernate.engine.PersistenceContext;
import org.hibernate.event.EventSource;
import org.hibernate.event.EvictEvent;
import org.hibernate.event.EvictEventListener;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.LazyInitializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* Defines the default evict event listener used by hibernate for evicting entities
* in response to generated flush events.  In particular, this implementation will
* remove any hard references to the entity that are held by the infrastructure
* (references held by application or other persistent instances are okay)
*
* @author Steve Ebersole
*/
public class DefaultEvictEventListener implements EvictEventListener {

  private static final Logger log = LoggerFactory.getLogger(DefaultEvictEventListener.class);

  /**
   * Handle the given evict event.
   *
   * @param event The evict event to be handled.
   * @throws HibernateException
   */
  public void onEvict(EvictEvent event) throws HibernateException {
    EventSource source = event.getSession();
    final Object object = event.getObject();
    final PersistenceContext persistenceContext = source.getPersistenceContext();

    if ( object instanceof HibernateProxy ) {
      LazyInitializer li = ( (HibernateProxy) object ).getHibernateLazyInitializer();
      Serializable id = li.getIdentifier();
      EntityPersister persister = source.getFactory().getEntityPersister( li.getEntityName() );
      if ( id == null ) {
        throw new IllegalArgumentException("null identifier");
      }

      EntityKey key = new EntityKey( id, persister, source.getEntityMode() );
      persistenceContext.removeProxy( key );

      if ( !li.isUninitialized() ) {
        final Object entity = persistenceContext.removeEntity( key );
        if ( entity != null ) {
          EntityEntry e = event.getSession().getPersistenceContext().removeEntry( entity );
          doEvict( entity, key, e.getPersister(), event.getSession() );
        }
      }
      li.unsetSession();
    }
    else {
      EntityEntry e = persistenceContext.removeEntry( object );
      if ( e != null ) {
        persistenceContext.removeEntity( e.getEntityKey() );
        doEvict( object, e.getEntityKey(), e.getPersister(), source );
      }
    }
  }

  protected void doEvict(
    final Object object,
    final EntityKey key,
    final EntityPersister persister,
    final EventSource session)
  throws HibernateException {

    if ( log.isTraceEnabled() ) {
      log.trace( "evicting " + MessageHelper.infoString(persister) );
    }

    // remove all collections for the entity from the session-level cache
    if ( persister.hasCollections() ) {
      new EvictVisitor( session ).process( object, persister );
    }

    // remove any snapshot, not really for memory management purposes, but
    // rather because it might now be stale, and there is no longer any
    // EntityEntry to take precedence
    // This is now handled by removeEntity()
    //session.getPersistenceContext().removeDatabaseSnapshot(key);

    new Cascade( CascadingAction.EVICT, Cascade.AFTER_EVICT, session )
        .cascade( persister, object );
  }
}
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