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/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.orm.hibernate4;

import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import org.springframework.core.Ordered;
import org.springframework.dao.DataAccessException;
import org.springframework.transaction.support.TransactionSynchronization;
import org.springframework.transaction.support.TransactionSynchronizationManager;

/**
 * Callback for resource cleanup at the end of a Spring-managed transaction
 * for a pre-bound Hibernate Session.
 *
 * @author Juergen Hoeller
 * @since 3.1
 */
class SpringSessionSynchronization implements TransactionSynchronization, Ordered {

	private final SessionHolder sessionHolder;

	private final SessionFactory sessionFactory;

	private boolean holderActive = true;


	public SpringSessionSynchronization(SessionHolder sessionHolder, SessionFactory sessionFactory) {
		this.sessionHolder = sessionHolder;
		this.sessionFactory = sessionFactory;
	}

	private Session getCurrentSession() {
		return this.sessionHolder.getSession();
	}


	public int getOrder() {
		return SessionFactoryUtils.SESSION_SYNCHRONIZATION_ORDER;
	}

	public void suspend() {
		if (this.holderActive) {
			TransactionSynchronizationManager.unbindResource(this.sessionFactory);
			// Eagerly disconnect the Session here, to make release mode "on_close" work on JBoss.
			getCurrentSession().disconnect();
		}
	}

	public void resume() {
		if (this.holderActive) {
			TransactionSynchronizationManager.bindResource(this.sessionFactory, this.sessionHolder);
		}
	}

	public void flush() {
		try {
			SessionFactoryUtils.logger.debug("Flushing Hibernate Session on explicit request");
			getCurrentSession().flush();
		}
		catch (HibernateException ex) {
			throw SessionFactoryUtils.convertHibernateAccessException(ex);
		}
	}

	public void beforeCommit(boolean readOnly) throws DataAccessException {
		if (!readOnly) {
			Session session = getCurrentSession();
			// Read-write transaction -> flush the Hibernate Session.
			// Further check: only flush when not FlushMode.MANUAL.
			if (!FlushMode.isManualFlushMode(session.getFlushMode())) {
				try {
					SessionFactoryUtils.logger.debug("Flushing Hibernate Session on transaction synchronization");
					session.flush();
				}
				catch (HibernateException ex) {
					throw SessionFactoryUtils.convertHibernateAccessException(ex);
				}
			}
		}
	}

	public void beforeCompletion() {
		Session session = this.sessionHolder.getSession();
		if (this.sessionHolder.getPreviousFlushMode() != null) {
			// In case of pre-bound Session, restore previous flush mode.
			session.setFlushMode(this.sessionHolder.getPreviousFlushMode());
		}
		// Eagerly disconnect the Session here, to make release mode "on_close" work nicely.
		session.disconnect();
	}

	public void afterCommit() {
	}

	public void afterCompletion(int status) {
		try {
			if (status != STATUS_COMMITTED) {
				// Clear all pending inserts/updates/deletes in the Session.
				// Necessary for pre-bound Sessions, to avoid inconsistent state.
				this.sessionHolder.getSession().clear();
			}
		}
		finally {
			this.sessionHolder.setSynchronizedWithTransaction(false);
		}
	}

}