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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. 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 Inc.
 *
 * 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.internal;

import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.ObjectDeletedException;
import org.hibernate.cache.spi.CacheKey;
import org.hibernate.cache.spi.access.SoftLock;
import org.hibernate.engine.spi.EntityEntry;
import org.hibernate.engine.spi.Status;
import org.hibernate.event.spi.EventSource;
import org.hibernate.internal.CoreLogging;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;

import org.jboss.logging.Logger;

/**
 * A convenience base class for listeners that respond to requests to perform a
 * pessimistic lock upgrade on an entity.
 *
 * @author Gavin King
 */
public abstract class AbstractLockUpgradeEventListener extends AbstractReassociateEventListener {
	private static final Logger log = CoreLogging.logger( AbstractLockUpgradeEventListener.class );

	/**
	 * Performs a pessimistic lock upgrade on a given entity, if needed.
	 *
	 * @param object The entity for which to upgrade the lock.
	 * @param entry The entity's EntityEntry instance.
	 * @param lockOptions contains the requested lock mode.
	 * @param source The session which is the source of the event being processed.
	 */
	protected void upgradeLock(Object object, EntityEntry entry, LockOptions lockOptions, EventSource source) {

		LockMode requestedLockMode = lockOptions.getLockMode();
		if ( requestedLockMode.greaterThan( entry.getLockMode() ) ) {
			// The user requested a "greater" (i.e. more restrictive) form of
			// pessimistic lock

			if ( entry.getStatus() != Status.MANAGED ) {
				throw new ObjectDeletedException(
						"attempted to lock a deleted instance",
						entry.getId(),
						entry.getPersister().getEntityName()
				);
			}

			final EntityPersister persister = entry.getPersister();

			if ( log.isTraceEnabled() ) {
				log.tracev(
						"Locking {0} in mode: {1}",
						MessageHelper.infoString( persister, entry.getId(), source.getFactory() ),
						requestedLockMode
				);
			}

			final SoftLock lock;
			final CacheKey ck;
			if ( persister.hasCache() ) {
				ck = source.generateCacheKey( entry.getId(), persister.getIdentifierType(), persister.getRootEntityName() );
				lock = persister.getCacheAccessStrategy().lockItem( ck, entry.getVersion() );
			}
			else {
				ck = null;
				lock = null;
			}

			try {
				if ( persister.isVersioned() && requestedLockMode == LockMode.FORCE  ) {
					// todo : should we check the current isolation mode explicitly?
					Object nextVersion = persister.forceVersionIncrement(
							entry.getId(), entry.getVersion(), source
					);
					entry.forceLocked( object, nextVersion );
				}
				else {
					persister.lock( entry.getId(), entry.getVersion(), object, lockOptions, source );
				}
				entry.setLockMode(requestedLockMode);
			}
			finally {
				// the database now holds a lock + the object is flushed from the cache,
				// so release the soft lock
				if ( persister.hasCache() ) {
					persister.getCacheAccessStrategy().unlockItem( ck, lock );
				}
			}

		}
	}
}