org.parancoe.web.ParancoeOpenSessionInViewInterceptor.java Source code

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Here is the source code for org.parancoe.web.ParancoeOpenSessionInViewInterceptor.java

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/**
 * Copyright (C) 2006-2010 The Parancoe Team <info@parancoe.org>
 *
 * This file is part of Parancoe Web.
 *
 * 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.parancoe.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate3.SessionHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * I don't know why the transaction annotations aren't recognized. This class is a workaround until
 * I will find a solution.
 *
 * @author Jacopo Murador <jacopo.murador at seesaw.it>
 */
public class ParancoeOpenSessionInViewInterceptor implements HandlerInterceptor {

    private static final Logger logger = LoggerFactory
            .getLogger(ParancoeOpenSessionInViewInterceptor.class.getPackage().getName());
    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object handler) throws Exception {
        logger.debug("Opening session and beginning transaction");
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        if (!TransactionSynchronizationManager.hasResource(sessionFactory)) {
            TransactionSynchronizationManager.bindResource(sessionFactory, new SessionHolder(session));
            TransactionSynchronizationManager.initSynchronization();
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest req, HttpServletResponse res, Object handler, ModelAndView model)
            throws Exception {
        //Nothing to do
    }

    @Override
    public void afterCompletion(HttpServletRequest req, HttpServletResponse res, Object handler, Exception ex)
            throws Exception {
        Session session = sessionFactory.getCurrentSession();
        try {
            if (ex == null) {
                logger.debug("Committing the database transaction");
                if (session.getTransaction().isActive() && !session.getTransaction().wasRolledBack()) {
                    session.getTransaction().commit();
                }
            } else {
                logger.error("Error occurrend in request handling", ex);
                logger.debug("Rolling back the database transaction");
                if (session.getTransaction().isActive() && !session.getTransaction().wasRolledBack()) {
                    session.getTransaction().rollback();
                }
            }
            if (session.isOpen()) {
                session.close();
            }
        } catch (Exception e) {
            logger.error("Error occurrend in request completion", ex);
            throw e;
        } finally {
            try {
                if (session.isOpen()) {
                    session.close();
                }
            } catch (Exception e) {/*do nothing*/

            }
            TransactionSynchronizationManager.unbindResource(sessionFactory);
            TransactionSynchronizationManager.clearSynchronization();
        }
    }
}